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You searched for: Publication year rev 7982-2018 Remove constraint Publication year rev: 7982-2018 Subject term catalysts Remove constraint Subject term: catalysts
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1. (B,N)-Doped 3D porous graphene–CNTs synthesized by chemical vapor deposition as a bi-functional catalyst for ORR and HER

Author:
Pingping Gao; Min Sun; Xiaobo Wu; Shuzhu Zhou; Xiaoting Deng; Zhiyong Xie; Li Xiao; Lihui Jiang; Qizhong Huang
Source:
RSC advances 2018 v.8 no.47 pp. 26934-26937
ISSN:
2046-2069
Subject:
acid tolerance; catalysts; density functional theory; electrochemistry; energy; hydrogen production; nanotubes; vapors
Abstract:
... Novel (B,N)-doped three-dimensional (3D) porous graphene–carbon nanotubes (CNTs) can be used as an excellent alkaline and acid tolerant electrocatalyst for both the oxygen reduction reaction (ORR) and the hydrogen evolution reaction (HER). Based on density functional theory, the H and O atoms’ pre-and post-adsorption energy can effectively reduce the reaction energy barrier. ...
DOI:
10.1039/c8ra04048f

2. (Guanidine)copper Complex-Catalyzed Enantioselective Dynamic Kinetic Allylic Alkynylation under Biphasic Condition

Author:
Xi-Yang Cui; Yicen Ge; Siu Min Tan; Huan Jiang; Davin Tan; Yunpeng Lu; Richmond Lee; Choon-Hong Tan
Source:
Journal of the American Chemical Society 2018 v.140 no.27 pp. 8448-8455
ISSN:
1520-5126
Subject:
Lewis bases; X-ray diffraction; alkynes; bromides; catalysts; copper; enantiomers; enantioselectivity; guanidinium; ligands; mass spectrometry; organobromine compounds
Abstract:
... Highly enantioselective allylic alkynylation of racemic bromides under biphasic condition is furnished in this report. This approach employs functionalized terminal alkynes as pro-nucleophiles and provides 6- and 7-membered cyclic 1,4-enynes with high yields and excellent enantioselectivities (up to 96% ee) under mild conditions. Enantioretentive derivatizations highlight the synthetic utility of ...
DOI:
10.1021/jacs.7b12806

3. (UV/Oxidative) dual curing polyurethane dispersion from cardanol based polyol: Synthesis and characterization

Author:
Vikash Mishra; Jatin Desai; Kalpesh I. Patel
Source:
Industrial crops and products 2018 v.111 pp. 165-178
ISSN:
0926-6690
Subject:
Fourier transform infrared spectroscopy; acetone; acid value; carbon; catalysts; coatings; color; epoxides; gels; nuclear magnetic resonance spectroscopy; phosphine; physicochemical properties; polyols; polyurethanes; propionic acid; solvents; stable isotopes; viscosity
Abstract:
... This study reports the synthesis and property evaluation of UV/oxidative dual curing waterborne polyurethane dispersion prepared from cardanol-based polyol using different mode of curing. Cardanol-based polyol was prepared by reacting epoxidized cardanol with itaconic acid in presence of triphenyl phosphine catalyst. Structures of cardanol-based intermediates (both epoxidized cardanol and polyol) ...
DOI:
10.1016/j.indcrop.2017.10.015

4. 1,2 Enriched polymerization of isoprene by cobalt complex carrying aminophosphory fused (PN3) ligand

Author:
Xiaoyu Jia; Xuequan Zhang; Dirong Gong
Source:
Journal of polymer science 2018 v.56 no.20 pp. 2286-2293
ISSN:
0887-624X
Subject:
catalysts; cobalt; differential scanning calorimetry; isomers; isoprene; ligands; magnesium; molecular weight; new family; nuclear magnetic resonance spectroscopy; polymerization; polymers; temperature
Abstract:
... Metal‐catalyzed selective isoprene polymerization has been a major entry toward cis‐1,4, trans‐1,4, and 3,4 isomers of polyisoprene, however, 1,2 selective polymerization of isoprene has not yet been achieved due to the steric problem. In this work, difluoro cobalt complexes carrying aminophosphory (‐HN‐P(=O) ᵗBu₂‐) fused pyrazol‐pyridine ligand has been prepared and characterized. In combination ...
DOI:
10.1002/pola.29201

5. 1,2-Benzoxathiin-4(3H)-one 2,2-dioxide – new enol nucleophile in three-component interaction with benzaldehydes and active methylene nitriles

Author:
Galyna V. Grygoriv; Dmitry A. Lega; Valentin P. Chernykh; Lucjusz Zaprutko; Andrzej K. Gzella; Anna Pawełczyk; Leonid A. Shemchuk
Source:
RSC advances 2018 v.8 no.65 pp. 37295-37302
ISSN:
2046-2069
Subject:
Lewis bases; aldehydes; ammonium acetate; catalysts; enols; nitriles; pyridines; salts
Abstract:
... The reactivity of 1,2-benzoxathiin-4(3H)-one 2,2-dioxide was studied in multicomponent type reactions for the first time, namely, in a three-component interaction with active methylene nitriles and aromatic aldehydes in order to construct condensed 2-amino-4H-pyran derivatives. The reaction outcome strongly depended on the nature of an active methylene nitrile and an arenecarbaldehyde. Application ...
DOI:
10.1039/c8ra06801a

6. 1,3-Bis(carboxymethyl)imidazolium Chloride as a Metal-Free and Recyclable Catalyst for the Synthesis of N-Allylanilines by Allylic Substitution of Alcohols

Author:
María Albert-Soriano; Laura Hernández-Martínez; Isidro M. Pastor
Source:
ACS sustainable chemistry & engineering 2018 v.6 no.11 pp. 14063-14070
ISSN:
2168-0485
Subject:
air; alcohols; aniline; catalysts
Abstract:
... The 1,3-bis(carboxymethyl)imidazolium chloride, which is easily and in a straightforward manner prepared readily from starting materials in multigram scale, is employed as catalyst in the synthesis of N-allylanilines by allylic substitution of alcohols with anilines. This metal-free catalyst allows the reaction to be carried out under mild reaction conditions (80 °C and air open vessel) and proved ...
DOI:
10.1021/acssuschemeng.8b02614

7. 1,3-Di-n-butylimidazolium tribromide [BBim]Br3: An efficient recyclable catalyst mediated synthesis of N-substituted azepines and their biological evaluation-interaction study with human serum albumin

Author:
Swetha K. Maddili; Rakhi Chowrasia; Vijaya Kumar Kannekanti; Himabindu Gandham
Source:
Journal of photochemistry and photobiology 2018 v.178 pp. 101-107
ISSN:
1011-1344
Subject:
DNA; acetylene; antibacterial properties; aromatic amines; calves; catalysts; drugs; fluconazole; fungi; human serum albumin; ionic liquids; thymus gland; ultraviolet-visible spectroscopy; wavelengths
Abstract:
... A majority of previously reported methods suffer from insufficient yields as well as more complicated experimental procedures, a smaller amount of isolated yields involving time-consuming and tiresome work-up with the use of metal catalyst and restricted scope of substrates. To overcome these issues, an environmentally benign, ionic liquid endorsed multi-component protocol to N-substituted azepine ...
DOI:
10.1016/j.jphotobiol.2017.10.028

8. 1-D copper(I) coordination polymer based on bidentate 1,3-dithioether ligand: Novel catalyst for azide-alkyne-cycloaddition (AAC) reaction

Author:
Sankar Saha; Kinkar Biswas; Basudeb Basu
Source:
Tetrahedron letters 2018 v.59 no.26 pp. 2541-2545
ISSN:
0040-4039
Subject:
X-ray diffraction; carbon; catalysts; catalytic activity; chemical structure; coordination polymers; copper; cycloaddition reactions; ligands; nuclear magnetic resonance spectroscopy; regioselectivity; stable isotopes; sulfur; triazoles
Abstract:
... A novel 1,3-bis(4-fluorophenylthio)-propane ligand based CuI 1-D polymeric coordination complex having formula ([(CuI)₂{ArS(CH₂)₃SAr}₂]ₙ, Ar = 4-F-C₆H₄) has been synthesized and characterized by ¹H NMR, ¹³C NMR and single crystal XRD techniques. This complex has been employed for the first time as suitable catalyst for base-free one-pot three-component regioselective azide-alkyne cycloaddition (AA ...
DOI:
10.1016/j.tetlet.2018.05.040

9. 10 kg scaled-up preparation of Al/Fe-pillared clay CWPO catalysts from concentrated precursors

Author:
Helir-Joseph Muñoz; Carlos Vallejo; Carolina Blanco; Antonio Gil; Miguel-Ángel Vicente; José-Herney Ramírez; Luis-Alejandro Galeano
Source:
Green chemistry 2018 v.20 no.22 pp. 5196-5208
ISSN:
1463-9270
Subject:
aluminum; aqueous solutions; bentonite; catalysts; catalytic activity; clay; green chemistry; iron; leaching; mineralization; mixing; models; oxidation; pH; particle size; phenol; refining; surface area; temperature; toxicity; washing
Abstract:
... In this work, the significant intensification of a bentonite pillaring process was achieved by using a novel methodological approach, leading to an intercalating Al/Fe mixed oligomeric precursor, around 100 times more concentrated than usually reported. In addition, the intercalating step was achieved directly on the clay with no previous swelling of the mineral being required; this allowed the su ...
DOI:
10.1039/c8gc02445f

10. 100% Atom-Economy Efficiency of Recycling Polycarbonate into Versatile Intermediates

Author:
Chien-Hsin Wu; Li-Yun Chen; Ru-Jong Jeng; Shenghong A. Dai
Source:
ACS sustainable chemistry & engineering 2018 v.6 no.7 pp. 8964-8975
ISSN:
2168-0485
Subject:
bisphenol A; carbamates; catalysts; diamines; polyurethanes; recycling
Abstract:
... This study demonstrates a simple and convenient two-step one-pot, highly efficient process of recycling poly(bisphenol A carbonate), i.e., PC, into versatile intermediates for polymers such as polyurethanes (PUs). Via a highly efficient and selective amine carbonylation reaction, PC is depolymerized by aliphatic diamines forming hydroxyl-N,N′-diphenylene-isopropylidenyl biscarbamates (hydroxyl DP- ...
DOI:
10.1021/acssuschemeng.8b01326

11. 11.5% efficiency of TiO₂ protected and Pt catalyzed n⁺np⁺-Si photocathodes for photoelectrochemical water splitting: manipulating the Pt distribution and Pt/Si contact

Author:
Zhihao Yin; Ronglei Fan; Guanping Huang; Mingrong Shen
Source:
Chemical communications 2018 v.54 no.5 pp. 543-546
ISSN:
1364-548X
Subject:
catalysts; cathodes; chemical reactions; coatings; energy conversion; hydrogen; platinum; silicon; titanium dioxide
Abstract:
... A combination of hydrogen passivation, electroless deposition of a Pt catalyst and coating a TiO₂ protective layer leads to an unprecedented 11.5% energy conversion efficiency and one-week stability of an n⁺np⁺-Si photocathode for solar water splitting. ...
DOI:
10.1039/c7cc08409a

12. 12-Molybdophosphoric acid anchored on aminopropylsilanized magnetic graphene oxide nanosheets (Fe₃O₄/GrOSi(CH₂)₃–NH₂/H₃PMo₁₂O₄₀): a novel magnetically recoverable solid catalyst for H₂O₂-mediated oxidation of benzylic alcohols under solvent-free conditions

Author:
Saeed Farhadi; Mohammad Hakimi; Mansoureh Maleki
Source:
RSC advances 2018 v.8 no.13 pp. 6768-6780
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; Raman spectroscopy; X-ray diffraction; anions; benzaldehyde; benzyl alcohol; catalysts; catalytic activity; electron transfer; energy-dispersive X-ray analysis; graphene oxide; hydrogen peroxide; ketones; magnetic materials; magnetism; nanocomposites; nanosheets; nitrogen; oxidation; scanning electron microscopy; surface area
Abstract:
... In this work, 12-molybdophosphoric acid (H₃PMo₁₂O₄₀, HPMo) was chemically anchored onto the surface of aminosilanized magnetic graphene oxide (Fe₃O₄/GrOSi(CH₂)₃–NH₂) and was characterized using different physicochemical techniques, such as powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, energy-dispersive X-ray analysis (EDX), scanning electron m ...
DOI:
10.1039/c8ra00312b

13. 15-Hydroxygermacranolides as Sources of Structural Diversity: Synthesis of Sesquiterpene Lactones by Cyclization and Rearrangement Reactions. Experimental and DFT Study

Author:
José María Álvarez-Calero; Enrique Ruiz; José Luis López-Pérez; Martín Jaraíz; José E. Rubio; Zacarías D. Jorge; Margarita Suárez; Guillermo M. Massanet
Source:
Journal of organic chemistry 2018 v.83 no.10 pp. 5480-5495
ISSN:
1520-6904
Subject:
Lewis acids; acetone; artemisinin; biomimetics; catalysts; chemical structure; cyclization reactions; eudesmanolides; guaianolides; organic chemistry; solvents
Abstract:
... A study on the electrophile-induced rearrangement of two 15-hydroxygermacranolides, salonitenolide and artemisiifolin, was carried out. These compounds underwent electrophilic intramolecular cyclizations or acid-mediated rearrangements to give sesquiterpene lactones with different skeletons such as eudesmanolides, guaianolides, amorphanolides, or other germacranolides. The cyclization that gives g ...
DOI:
10.1021/acs.joc.8b00407

14. 1D N-doped hierarchically porous hollow carbon tubes derived from a supramolecular template as metal-free electrocatalysts for a highly efficient oxygen reduction reaction

Author:
Lei Zhao; Xu-Lei Sui; Qing-Yan Zhou; Jia-Zhan Li; Jing-Jia Zhang; Guo-Sheng Huang; Zhen-Bo Wang
Source:
Journal of materials chemistry 2018 v.6 no.15 pp. 6212-6219
ISSN:
2050-7496
Subject:
active sites; carbon; catalysts; electrochemistry; melamine; nitrogen; porous media; surface area
Abstract:
... For the first time, a supramolecular template-derived synthesis approach is reported to fabricate 1D nitrogen-doped hollow carbon tubes (h-NCTs) with a hierarchical micro/mesoporous structure. A melamine cyanurate supramolecular assembly is used as the tubular-structure guiding template and nitrogen source, endowing the obtained h-NCTs catalyst with proliferative catalytic active sites, a high sur ...
DOI:
10.1039/c8ta01296b

15. 2-Acetylthienopyridine Synthesis via Thiolation and Copper-Catalyzed Cyclization of o-Propynol Fluoropyridine Using Xanthate as a Thiol Surrogate

Author:
Yibiao Li; Xianglin Luo; Yan Shao; Lu Chen
Source:
Journal of organic chemistry 2018 v.83 no.15 pp. 8768-8774
ISSN:
1520-6904
Subject:
Lewis bases; catalysts; chemoselectivity; copper; moieties; organic chemistry; oxidation; pyridines; thiols
Abstract:
... 2-Acylthienopyridines and related heterocycles are readily prepared in moderate to good yields under mild conditions by a nucleophilic thiolation, copper-catalyzed cyclization, and an oxidation cascade process using potassium xanthate as the thiol source. Moreover, excellent chemoselectivity, broad substrate scope, and good functional group tolerance are prominent features of this transformation. ...
DOI:
10.1021/acs.joc.8b01037

16. 2-D porous Ni₃N–Co₃N hybrids derived from ZIF-67/Ni(OH)₂ sheets as a magnetically separable catalyst for hydrogenation reactions

Author:
Lin Zhang; Aiping Wu; Mei Tian; Yinglu Xiao; Xia Shi; Haijing Yan; Chungui Tian; Honggang Fu
Source:
Chemical communications 2018 v.54 no.79 pp. 11088-11091
ISSN:
1364-548X
Subject:
catalysts; hydrogenation; magnetism; nickel; porosity
Abstract:
... 2-D porous Ni₃N–Co₃N hybrids were prepared by initial controllable growth of ZIF-67 on Ni(OH)₂ sheets followed by nitridation. The synergistic nitridation of Ni(OH)₂ and ZIF-67, is demonstrated to be important for the formation of 2-D porous hybrids that can be used as a magnetically separable catalyst for hydrogenation reactions. ...
DOI:
10.1039/c8cc06099a

17. 2-Nitrobenzaldehyde Thiocarbohydrazone Assisted Precise Extraction Spectrophotometric Method for the Determination of Ruthenium(III) in Alloy and Catalysts

Author:
Sunil B. Zanje; Vishal J. Suryavanshi; Arjun N. Kokare; Anita A. Ghare; Ganesh S. Kamble; Pravin N. Kamble; Mansing A. Anuse
Source:
Journal of analytical chemistry 2018 v.73 no.5 pp. 438-451
ISSN:
1061-9348
Subject:
absorbance; absorption; acetic acid; alloys; catalysts; color; ethylene dichloride; heat; ligands; ruthenium; solvents; spectrophotometers; stoichiometry
Abstract:
... A simple, rapid, selective, sensitive and reliable extractive spectrophotometric method was developed for the determination of ruthenium(III) using 2-nitrobenzaldehyde thiocarbohydrazone (2-NBATCH) as a chromogenic chelating ligand. The ruthenium(III)‒2-NBATCH complex is formed in aqueous acetic acid media (0.7 M) containing an organic solvent after 5 min heating on a water bath. The red colored c ...
DOI:
10.1134/S1061934818050131

18. 2D metal–organic-framework array-derived hierarchical network architecture of cobalt oxide flakes with tunable oxygen vacancies towards efficient oxygen evolution reaction

Author:
Yuanjian Li; Huanwen Wang; Yuzhu Li; Qiang Wang; Debao Li; Rui Wang; Beibei He; Yansheng Gong
Source:
Journal of catalysis 2018 v.364 pp. 48-56
ISSN:
0021-9517
Subject:
activation energy; catalysts; catalytic activity; cobalt; cobalt oxide; coordination polymers; density functional theory; electric power; electrical conductivity; electrodes; foams; hydrogen production; hydrogenation; nickel; oxygen; oxygen production
Abstract:
... The development of highly active dual-functional electrocatalysts, especially for oxygen evolution reaction (OER), is highly desirable to electrocatalyze water splitting for hydrogen production. Herein, a cobalt metal-organic frameworks (Co-MOFs) array is employed as the platform to fabricate oxygen-defect-rich Co₃O₄ flakes that are vertical grown on nickel foam substrates. This MOFs-derived Co₃O₄ ...
DOI:
10.1016/j.jcat.2018.05.006

19. 2D, 3D mesostructured silicas templated mesoporous manganese dioxide for selective catalytic reduction of NOx with NH3

Author:
Jinsuo Gao; Yanling Han; Jincheng Mu; Shouchun Wu; Feng Tan; Yong Shi; Xinyong Li
Source:
Journal of colloid and interface science 2018 v.516 pp. 254-262
ISSN:
0021-9797
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; X-ray photoelectron spectroscopy; ammonia; catalysts; catalytic activity; manganese dioxide; manganese monoxide; nitrogen oxides; physicochemical properties; porous media; sulfur dioxide; surface area; transmission electron microscopy
Abstract:
... Employing nanocasting method, mesoporous MnO2 catalysts with large specific surface area and regular pore structure were synthesized by using three different types of mesostructure silicas (KIT-6, SBA-15, MCM-41) as hard templates. The physical and chemical properties of the three different mesostructured manganese oxide materials were comparatively and systematically characterized by using XRD, F ...
DOI:
10.1016/j.jcis.2018.01.048

20. 2D-aluminum-modified solids as simultaneous support and cocatalyst for in situ polymerizations of olefins

Author:
Hipassia M. Moura; Nicole L. Gibbons; Stephen A. Miller; Heloise O. Pastore
Source:
Journal of catalysis 2018 v.362 pp. 129-145
ISSN:
0021-9517
Subject:
acidity; catalysts; ethylene; geometry; nanocomposites; nuclear magnetic resonance spectroscopy; polymerization; transmission electron microscopy; zirconium
Abstract:
... The reaction of methylaluminoxane (MAO) with 2D and 3D inorganic supports such as magadiite, [Al]-magadiite, n-alkyl-AlPO-kanemite, MCM-41 and MCM-48 was investigated by solid state NMR spectroscopy. The products obtained from the reaction of aluminum-modified magadiite and MAO were dominated by surface species of the type SiOCH3/AlOCH3. A mechanism for the surface reactions of MAO is proposed. Th ...
DOI:
10.1016/j.jcat.2018.04.002

21. 2D–2D Heterostructured UNiMOF/g-C₃N₄ for Enhanced Photocatalytic H₂ Production under Visible-Light Irradiation

Author:
Aihui Cao; Lijuan Zhang; Yun Wang; Huijun Zhao; Hong Deng; Xueming Liu; Zhang Lin; Xintai Su; Fan Yue
Source:
ACS sustainable chemistry & engineering 2018 v.7 no.2 pp. 2492-2499
ISSN:
2168-0485
Subject:
carbon nitride; catalysts; coordination polymers; hydrogen production; irradiation; nickel; photocatalysis
Abstract:
... On the basis of ultrathin two-dimensional (2D) nickel metal organic framework (UNiMOF) nanoflakes and 2D g-C₃N₄ nanoflakes, fresh visible-light-driven 2D/2D heterostructure catalysts were designed, which were assembled with a simplistic electrostatic self-assembly process. The photocatalytic performance of UNiMOF/g-C₃N₄ for H₂ production was evaluated in visible light. The hydrogen evolution of 25 ...
DOI:
10.1021/acssuschemeng.8b05396

22. 3-Miktoarm Star Terpolymers via Janus Polymerization: One-Step Synthesis and Self-Assembly

Author:
Yao Li; Moritz von der Lühe; Felix H. Schacher; Jun Ling
Source:
Macromolecules 2018 v.51 no.13 pp. 4938-4944
ISSN:
1520-5835
Subject:
aqueous solutions; biodegradability; catalysts; crystallization; drugs; epoxides; gene transfer; hydrophilicity; hydrophobicity; lutetium; nanorods; permeability; polyethylene glycol; polymerization
Abstract:
... Janus polymerization combines cationic and anionic polymerizations into the two ends of a single growing chain and presents a novel pathway to produce topologically defined polymers. In this contribution, we report a one-step synthesis of 3-miktoarm star terpolymers of poly(ethylene glycol)-star-poly(ε-caprolactone)-star-poly(ε-caprolactone-co-tetrahydrofuran) (PEG-star-PCL-star-P(CL-co-THF)) via ...
DOI:
10.1021/acs.macromol.8b00949

23. 3D MnO2 hollow microspheres ozone-catalysis coupled with flat-plate membrane filtration for continuous removal of organic pollutants: Efficient heterogeneous catalytic system and membrane fouling control

Author:
Zhuoyan He; Dehua Xia; Yajing Huang; Xiuqin Tan; Chun He; Lingling Hu; Huanjunwa He; Jiawei Zeng; Wenjun Xu; Dong Shu
Source:
Journal of hazardous materials 2018 v.344 pp. 1198-1208
ISSN:
0304-3894
Subject:
bisphenol A; catalysts; catalytic activity; fluorescence emission spectroscopy; fouling; hydrophilicity; manganese dioxide; microfiltration; microparticles; models; ozonation; pollutants; slurries; wastewater
Abstract:
... A heterogeneous catalytic ozonation/membrane filtration (HCOMF) system was fabricated by integrating a flat-plate polyvinylidene fluoride (PVDF) membrane module along with a slurry catalytic ozonation reactor. The performance and catalytic activity of HCOMF was evaluated for degradation of model wastewater containing bisphenol A (BPA) and humid acid (HA) under different permeation flux in long-ter ...
DOI:
10.1016/j.jhazmat.2017.11.024

24. 3D Nitrogen, Sulfur-Codoped Carbon Nanomaterial-Supported Cobalt Oxides with Polyhedron-Like Particles Grafted onto Graphene Layers as Highly Active Bicatalysts for Oxygen-Evolving Reactions

Author:
Xiaobo Huang; Jianqiang Wang; Hongliang Bao; Xiangkun Zhang; Yongmin Huang
Source:
ACS applied materials & interfaces 2018 v.10 no.8 pp. 7180-7190
ISSN:
1944-8252
Subject:
batteries; catalysts; catalytic activity; cobalt; cobalt oxide; crosslinking; durability; electrochemistry; electrodes; energy conversion; fuel cells; graphene; graphene oxide; moieties; nanomaterials; nitrogen; oxygen; oxygen production; sulfides; sulfur
Abstract:
... The extensive research and developments of highly efficient oxygen electrode electrocatalysts to get rid of the kinetic barriers for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are very important in energy conversion and storage devices. Especially, exploring nonprecious metal alternatives to replace traditional noble metal catalysts with high cost and poor durability is th ...
DOI:
10.1021/acsami.8b00504

25. 3D Pd/Co core–shell nanoneedle arrays as a high-performance cathode catalyst layer for AAEMFCs

Author:
Jia Jia; Hongmei Yu; Xueqiang Gao; Jun Chi; Yachao Zeng; Bowen Qin; Dewei Yao; Wei Song; Zhigang Shao; Baolian Yi
Source:
RSC advances 2018 v.8 no.23 pp. 12887-12893
ISSN:
2046-2069
Subject:
anion-exchange membranes; catalysts; cathodes; cobalt; fuel cells; palladium; platinum; stainless steel
Abstract:
... A novel cathode architecture using vertically aligned Co nanoneedle arrays as an ordered support for application in alkaline anion-exchange membrane fuel cells (AAEMFCs) has been developed. The Co nanoneedle arrays were directly grown on a stainless steel sheet via a hydrothermal reaction and then a Pd layer was deposited on the surface of the Co nanoneedle arrays using a vacuum sputter-deposition ...
DOI:
10.1039/c7ra13677c

26. 3D Porous Cobalt–Iron–Phosphorus Bifunctional Electrocatalyst for the Oxygen and Hydrogen Evolution Reactions

Author:
HyoWon Kim; SeKwon Oh; EunAe Cho; HyukSang Kwon
Source:
ACS sustainable chemistry & engineering 2018 v.6 no.5 pp. 6305-6311
ISSN:
2168-0485
Subject:
catalysts; cobalt; electrochemistry; electrodes; foams; hydrogen production; iron; microstructure; oxygen; oxygen production; surface area
Abstract:
... A 3D porous Co–Fe–P foam fabricated using electrodeposition is presented as a high-performance and durable catalyst for both oxygen and hydrogen evolution reactions. To establish optimal Fe/Co ratio of the catalyst, Co–Fe–P films were electrodeposited with Fe/Co ratio of 0.2, 0.4, 1.1, and 3.3. Among the prepared samples, the Co–Fe–P film with the Fe/Co ratio of 1.1 (Co–Fe–P-1.1) exhibited the hig ...
DOI:
10.1021/acssuschemeng.8b00118

27. 3D Printed Graphene Electrodes’ Electrochemical Activation

Author:
Michelle P. Browne; Filip Novotný; Zdeněk Sofer; Martin Pumera
Source:
ACS applied materials & interfaces 2018 v.10 no.46 pp. 40294-40301
ISSN:
1944-8252
Subject:
catalysts; electrochemistry; electrodes; energy; graphene; hydrogen production; iron; manufacturing; melting; oxides; polymers; printers; solvents
Abstract:
... Three-dimensional (3D) printing technologies are emerging as an important tool for the manufacturing of electrodes for various electrochemistry applications. It has been previously shown that metal 3D electrodes, modified with metal oxides, are excellent catalysts for various electrochemical energy and sensing applications. However, the metal 3D printing process, also known as selective laser melt ...
DOI:
10.1021/acsami.8b14701

28. 3D cellular CoS₁.₀₉₇/nitrogen doped graphene foam: a durable and self-supported bifunctional electrode for overall water splitting

Author:
Hui Liang; Degang Jiang; Shuang Wei; Xueying Cao; Tao Chen; Bingbing Huo; Zhi Peng; Chenwei Li; Jingquan Liu
Source:
Journal of materials chemistry 2018 v.6 no.33 pp. 16235-16245
ISSN:
2050-7496
Subject:
anodes; catalysts; catalytic activity; cathodes; foaming; graphene; nanoparticles; temperature
Abstract:
... The design and development of highly efficient and durable non-precious metal catalysts are of great significance for the HER and the OER, especially bifunctional catalysts for overall water splitting. Here, a series of novel composites of 3D nitrogen-doped graphene foams with homogeneously dispersed CoS₁.₀₉₇ nanoparticles (NPs) are synthesized through hydrazine-induced foaming and thermal-treatme ...
DOI:
10.1039/c8ta05407j

29. 3D flower-like hierarchical NiCo₂O₄ architecture on carbon cloth fibers as an anode catalyst for high-performance, durable direct urea fuel cells

Author:
M. Ranjani; N. Senthilkumar; G. Gnana kumar; Arumugam Manthiram
Source:
Journal of materials chemistry A 2018 v.6 no.45 pp. 23019-23027
ISSN:
2050-7496
Subject:
anodes; carbon; carbon fibers; catalysts; chemical structure; durability; fuel cells; humans; nickel; oxidation; renewable energy sources; urea; urine
Abstract:
... Direct urea fuel cells (DUFCs) are considered as promising green energy devices for sustainable energy generation from human waste; however, the lack of efficient urea oxidation reaction electrocatalysts remains a formidable challenge for their practical utility. Herein, we report a flexible, binder-free electrode with a 3-dimensional (3D) hierarchical nickel cobaltite (NiCo₂O₄) architecture on ca ...
DOI:
10.1039/c8ta08405j

30. 3D mesoporous CuFe2O4 as a catalyst for photo-Fenton removal of sulfonamide antibiotics at near neutral pH

Author:
Jinsuo Gao; Shouchun Wu; Yanling Han; Feng Tan; Yong Shi; Mengyao Liu; Xinyong Li
Source:
Journal of colloid and interface science 2018 v.524 pp. 409-416
ISSN:
0021-9797
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; active sites; antibiotics; catalysts; copper; free radicals; hydrogen peroxide; hydroxyl radicals; iron; mineralization; nitrates; nitrogen; pH; porous media; sulfamethoxazole; transmission electron microscopy
Abstract:
... Increasing the amount of surface active sites of the material may be a feasible way to improve the efficiency ofthe generation of Fe2+ in the photo-Fenton process. In this work, a simple synthesis method was adopted to synthesize 3D ordered mesoporous CuFe2O4 with large specific surface areaby using ferric nitrate and copper nitrate as the precursor and KIT-6 as the template. The synthesized mater ...
DOI:
10.1016/j.jcis.2018.03.112

31. 3D nanoporous Ni/V₂O₃ hybrid nanoplate assemblies for highly efficient electrochemical hydrogen evolution

Author:
Mei Ming; Yuling Ma; Yun Zhang; Lin-Bo Huang; Lu Zhao; Yu-Yun Chen; Xing Zhang; Guangyin Fan; Jin-Song Hu
Source:
Journal of materials chemistry A 2018 v.6 no.43 pp. 21452-21457
ISSN:
2050-7496
Subject:
active sites; annealing; catalysts; catalytic activity; durability; electrical properties; electrochemistry; hydrogen production; mass transfer; nanopores; nickel; structure-activity relationships; vanadium
Abstract:
... Nickel-based non-noble-metal materials have emerged as promising catalysts for electrochemical hydrogen production in view of their attractive intrinsic activities, electrical properties and low cost. Exploring new candidates for further improving the performances of nickel-based catalysts and understanding the structure–activity relationship are still necessary to reduce the overpotential of the ...
DOI:
10.1039/c8ta07701k

32. 3D numerical investigation of clamping pressure effect on the performance of proton exchange membrane fuel cell with interdigitated flow field

Author:
M. Movahedi; A. Ramiar; A.A. Ranjber
Source:
Energy 2018 v.142 pp. 617-632
ISSN:
0360-5442
Subject:
anodes; catalysts; cathodes; deformation; electrolytes; fuel cells; models; permeability; polymers; porosity; temperature
Abstract:
... In this work, the performance of Polymer Electrolyte Membrane Fuel Cells (PEMFCs) with interdigitated gas distributor under clamping pressure is numerically studied. A three-dimensional model of PEMFC has been developed and used to study the effect of displacement and deformation caused by clamping pressure on the transport phenomena and device performance. The influence of different parameters su ...
DOI:
10.1016/j.energy.2017.10.020

33. 3D printing in chemical engineering and catalytic technology: structured catalysts, mixers and reactors

Author:
Cesar Parra-Cabrera; Clement Achille; Simon Kuhn; Rob Ameloot
Source:
Chemical Society reviews 2018 v.47 no.1 pp. 209-230
ISSN:
1460-4744
Subject:
catalysts; chemical engineering; chemistry; computer techniques; digital database; fluid mechanics; geometry; information processing; manufacturing; materials science; mixers; models
Abstract:
... Computer-aided fabrication technologies combined with simulation and data processing approaches are changing our way of manufacturing and designing functional objects. Also in the field of catalytic technology and chemical engineering the impact of additive manufacturing, also referred to as 3D printing, is steadily increasing thanks to a rapidly decreasing equipment threshold. Although still in a ...
DOI:
10.1039/c7cs00631d

34. 3D web freestanding RuO₂–Co₃O₄ nanowires on Ni foam as highly efficient cathode catalysts for Li–O₂ batteries

Author:
Zhuo-Liang Jiang; Jing Xie; Cong-Shan Luo; Meng-Yang Gao; Huan-Liang Guo; Mo-Han Wei; Hong-Jun Zhou; Hui Sun
Source:
RSC advances 2018 v.8 no.41 pp. 23397-23403
ISSN:
2046-2069
Subject:
air; batteries; catalysts; cathodes; cobalt oxide; energy density; foams; ions; lithium; nanoparticles; nanowires; nickel; oxygen
Abstract:
... The mechanism of Li–O₂ batteries is based on the reactions of lithium ions and oxygen, which hold a theoretical higher energy density of approximately 3500 W h kg⁻¹. In order to improve the practical specific capacity and cycling performance of Li–O₂ batteries, a catalytically active mechanically robust air cathode is required. In this work, we synthesized a freestanding catalytic cathode with RuO ...
DOI:
10.1039/c8ra03325k

35. 3D-macroporous chitosan-based scaffolds with in situ formed Pd and Pt nanoparticles for nitrophenol reduction

Author:
Dmitriy Berillo; Andrew Cundy
Source:
Carbohydrate polymers 2018 v.192 pp. 166-175
ISSN:
0144-8617
Subject:
Fourier transform infrared spectroscopy; adsorption; ambient temperature; catalysts; catalytic activity; chitosan; cryogels; electrostatic interactions; energy-dispersive X-ray analysis; glutaraldehyde; metal ions; models; nanoparticles; nitrogen; p-nitrophenol; palladium; platinum; scanning electron microscopy; transmission electron microscopy
Abstract:
... 3D-macroporous chitosan-based scaffolds (cryogels) were produced via growth of metal-polymer coordinated complexes and electrostatic interactions between oppositely charged groups of chitosan and metal ions under subzero temperatures. A mechanism of reduction of noble metal complexes inside the cryogel walls by glutaraldehyde is proposed, which produces discrete and dispersed noble metal nanoparti ...
DOI:
10.1016/j.carbpol.2018.03.038

36. 3d Transition Metals for C–H Activation

Author:
Parthasarathy Gandeepan; Thomas Müller; Daniel Zell; Gianpiero Cera; Svenja Warratz; Lutz Ackermann
Source:
Chemical reviews 2018 v.119 no.4 pp. 2192-2452
ISSN:
1520-6890
Subject:
carbon-hydrogen bond activation; catalysts; cost effectiveness; drugs; pharmaceutical industry; plant protection; toxicity; transition elements
Abstract:
... C–H activation has surfaced as an increasingly powerful tool for molecular sciences, with notable applications to material sciences, crop protection, drug discovery, and pharmaceutical industries, among others. Despite major advances, the vast majority of these C–H functionalizations required precious 4d or 5d transition metal catalysts. Given the cost-effective and sustainable nature of earth-abu ...
DOI:
10.1021/acs.chemrev.8b00507

37. 3d-Metal Catalyzed N- and C-Alkylation Reactions via Borrowing Hydrogen or Hydrogen Autotransfer

Author:
Torsten Irrgang; Rhett Kempe
Source:
Chemical reviews 2018 v.119 no.4 pp. 2524-2549
ISSN:
1520-6890
Subject:
alkylation; amines; biomass; carbon; catalysts; catalytic activity; chemical bonding; cobalt; copper; hydrogen; iron; manganese; nickel
Abstract:
... The conservation of our element resources is a fundamental challenge of mankind. The development of alcohol refunctionalization reactions is a possible fossil carbon conservation strategy since alcohols can be obtained from indigestible and abundantly available biomass. The conservation of our rare noble metals, frequently used in key technologies such as catalysis, might be feasible by replacing ...
DOI:
10.1021/acs.chemrev.8b00306

38. 4-Phenoxyphenol-Functionalized Reduced Graphene Oxide Nanosheets: A Metal-Free Fenton-Like Catalyst for Pollutant Destruction

Author:
Lai Lyu; Guangfei Yu; Lili Zhang; Chun Hu; Yong Sun
Source:
Environmental science & technology 2018 v.52 no.2 pp. 747-756
ISSN:
1520-5851
Subject:
catalysts; copolymerization; electrons; graphene oxide; hydrogen peroxide; hydroxyl radicals; nanosheets; pH; pollutants; polymers
Abstract:
... Metal-containing Fenton catalysts have been widely investigated. Here, we report for the first time a highly effective stable metal-free Fenton-like catalyst with dual reaction centers consisting of 4-phenoxyphenol-functionalized reduced graphene oxide nanosheets (POP-rGO NSs) prepared through surface complexation and copolymerization. Experimental and theoretical studies verified that dual reacti ...
DOI:
10.1021/acs.est.7b04865

39. 6,6′-Thiobis(methylene)-β-cyclodextrin dimer as a dimeric host and reusable promoter for synthesis of chromenones in water

Author:
Vijay Vilas Shinde; Daham Jeong; Eunae Cho; Seunho Jung
Source:
Tetrahedron 2018 v.74 pp. 194-198
ISSN:
0040-4020
Subject:
beta-cyclodextrin; catalysts; chemical reactions; chemical structure; nuclear magnetic resonance spectroscopy; organic compounds; reaction mechanisms; recycling; solvents; spectral analysis
Abstract:
... Herein, two unit of β-cyclodextrin linked by thiomethylene bridge was synthesized and employed as a novel efficient supramolecular host for the synthesis of biologically active chromenones templates via three-component single-pot reaction. A possible reaction mechanism through molecular complexation is suggested based on 2D ROESY NMR spectroscopic analysis. Moreover, the catalyst could be easily r ...
DOI:
10.1016/j.tet.2017.11.065

40. 8-Hydroxy-2-methylquinoline-modified H₄SiW₁₂O₄₀: a reusable heterogeneous catalyst for acetal/ketal formation

Author:
Li-jun Liu; Qing-jie Luan; Jing Lu; Dong-mei Lv; Wen-zeng Duan; Xu Wang; Shu-wen Gong
Source:
RSC advances 2018 v.8 no.46 pp. 26180-26187
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; catalysts; catalytic activity; cyclohexanones; scanning electron microscopy; temperature; thermogravimetry; titration
Abstract:
... A heteropoly acid based organic hybrid heterogeneous catalyst, HMQ-STW, was prepared by combining 8-hydroxy-2-methylquinoline (HMQ) with Keggin-structured H₄SiW₁₂O₄₀ (STW). The catalyst was characterized via elemental analysis, X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), thermogravimetric analysis (TG) and potentiometric titratio ...
DOI:
10.1039/c8ra04471f

41. A Bifunctional β-Diiminate Zinc Catalyst with CO2/Epoxides Copolymerization and RAFT Polymerization Capacities for Versatile Block Copolymers Construction

Author:
Yao-Yao Zhang; Guan-Wen Yang; Guang-Peng Wu
Source:
Macromolecules 2018 v.51 no.10 pp. 3640-3646
ISSN:
1520-5835
Subject:
X-ray diffraction; carbon dioxide; catalysts; catalytic activity; composite polymers; copolymerization; cyclohexenes; differential scanning calorimetry; epoxides; moieties; molecular weight; nanomaterials; nuclear magnetic resonance spectroscopy; propionic acid; zinc
Abstract:
... Construction of block copolymers is a practical method for modifying the properties of CO₂-based polycarbonates (CO₂-PCs) in order to meet specific needs. Herein, we report a well-defined single-site β-diiminate zinc complex 1 equipped with the capacities of coordination copolymerization of CO₂/epoxide and reversible addition–fragmentation chain transfer (RAFT) polymerization of vinyl monomers. Co ...
DOI:
10.1021/acs.macromol.8b00576

42. A CaMnAl-hydrotalcite solid basic catalyst toward the aldol condensation reaction with a comparable level to liquid alkali catalysts

Author:
Weihan Bing; Huimin Wang; Lei Zheng; Deming Rao; Yusen Yang; Lirong Zheng; Bin Wang; Yangdong Wang; Min Wei
Source:
Green chemistry 2018 v.20 no.13 pp. 3071-3080
ISSN:
1463-9270
Subject:
X-ray absorption spectroscopy; X-ray diffraction; X-ray photoelectron spectroscopy; active sites; calcium; catalysts; catalytic activity; condensation reactions; desorption; formaldehyde; green chemistry; hydroxides; liquids; manganese
Abstract:
... In a number of heterogeneous catalysis processes, the promotion effect toward active sites is of vital importance and remains a challenge to obtain largely-improved catalytic performance. Herein, rehydrated Ca₄MnₓAl-layered double hydroxides (denoted as re-Ca₄MnₓAl-LDH) were prepared based on a structure memory effect of LDH precursors, which exhibited extremely high heterogeneous catalytic perfor ...
DOI:
10.1039/c8gc00851e

43. A Carbon Nitride/Fe Quaterpyridine Catalytic System for Photostimulated CO2-to-CO Conversion with Visible Light

Author:
Claudio Cometto; Ryo Kuriki; Lingjing Chen; Kazuhiko Maeda; Tai-Chu Lau; Osamu Ishitani; Marc Robert
Source:
Journal of the American Chemical Society 2018 v.140 no.24 pp. 7437-7440
ISSN:
1520-5126
Subject:
carbon dioxide; carbon nitride; catalysts; feedstocks; graphene; iron; irradiation; photocatalysis; photosensitizing agents; porous media; solar energy
Abstract:
... Efficient and selective photostimulated CO₂-to-CO reduction by a photocatalytic system consisting of an iron-complex catalyst and a mesoporous graphitic carbon nitride (mpg-C₃N₄) redox photosensitizer is reported for the first time. Irradiation in the visible region (λ ≥ 400 nm) of an CH₃CN/triethanolamine (4:1, v/v) solution containing [Fe(qpy)(H₂O)₂]²⁺ (qpy = 2,2′:6′,2′′:6′′,2′′-quaterpyridine) ...
DOI:
10.1021/jacs.8b04007

44. A Catalyst from Burkholderia cenocepacia for Efficient Anti-Prelog’s Bioreduction of 3,5-Bis(Trifluoromethyl) Acetophenone

Author:
Songzhu Yu; Hongxia Li; Yan Lu; Guojun Zheng
Source:
Applied biochemistry and biotechnology 2018 v.184 no.4 pp. 1319-1331
ISSN:
0273-2289
Subject:
Burkholderia cenocepacia; Escherichia coli; amino acids; catalysts; enantioselectivity; ethanol; genome mining; manganese; molecular weight; pH; temperature
Abstract:
... (R)-3, 5-Bis(trifluoromethyl)phenyl ethanol is a key chiral intermediate for the synthesis of aprepitant. Through a genome mining approach, an NADPH-dependent short-chain dehydrogenases derived from Burkholderia cenocepacia (Bc-SDR) was discovered with excellent anti-Prelog’s stereoselectivity of reducing 3, 5-bis(trifluoromethyl) acetophenone. The enzyme with 247 amino acids was successfully expr ...
DOI:
10.1007/s12010-017-2628-8

45. A Catalyst-Free Epoxy Vitrimer System Based on Multifunctional Hyperbranched Polymer

Author:
Jiarui Han; Tuan Liu; Cheng Hao; Shuai Zhang; Baohua Guo; Jinwen Zhang
Source:
Macromolecules 2018 v.51 no.17 pp. 6789-6799
ISSN:
1520-5835
Subject:
anhydrides; catalysts; coatings; corrosion; crosslinking; epoxides; glass transition temperature; mechanical properties; moieties; polymers; stress relaxation; thermal stability; toxicity; transesterification
Abstract:
... To date, all epoxy vitrimer systems reported in the literature rely on addition of significant amounts of catalysts to achieve the dynamic transesterification reaction (TER). However, the catalysts used in vitrimers are often toxic and have poor miscibility with organic compounds, and they may further comprise the application performance like corrosion resistance. Moreover, the reprocessing and re ...
DOI:
10.1021/acs.macromol.8b01424

46. A Combined Computational and Experimental Study on the Polymerization of ε-Caprolactone

Author:
Raphael P. Rosa; Filipe V. Ferreira; Ana Paola K. Saravia; Silvana A. Rocco; Mauricio L. Sforça; Rubia F. Gouveia; Liliane M. F. Lona
Source:
Industrial & engineering chemistry process design and development 2018 v.57 no.40 pp. 13387-13395
ISSN:
1520-5045
Subject:
biodegradability; catalysts; mathematical models; molecular weight; nuclear magnetic resonance spectroscopy; octanoic acid; polymerization; polymers; prediction; process design
Abstract:
... This paper reports the study on the synthesis of poly(ε-caprolactone)—PCL by ring-opening polymerization (ROP) of ε-caprolactone (CL) monomer with focus on mathematic developing of the growth mechanisms of polymer chain. Kinetics and mathematical modeling of ROP of CL was carried out to replicate the different experimental conditions. The computational results of conversion and molecular weight of ...
DOI:
10.1021/acs.iecr.8b03288

47. A Comparative Ab Initio Study of Anhydrous Dehydrogenation of Linear-Chain Alcohols on Cu(110)

Author:
Wei Chen; Ekin Dogus Cubuk; Matthew M. Montemore; Christian Reece; Robert J. Madix; Cynthia M. Friend; Efthimios Kaxiras
Source:
Journal of physical chemistry 2018 v.122 no.14 pp. 7806-7815
ISSN:
1932-7455
Subject:
1-propanol; adsorption; butanol; catalysts; catalytic activity; chemical bonding; copper; dehydrogenation; ethanol; formaldehyde; methanol; thermodynamics; van der Waals forces
Abstract:
... The catalytic behavior of Cu surfaces in the anhydrous production of aldehydes from alcohols, a process of industrial significance, is puzzling: the two simplest alcohols (methanol and ethanol) show dramatically different decomposition behavior on Cu. Here, we study the thermodynamic and kinetic processes involved in the anhydrous dehydrogenation of linear-chain alcohols including methanol, ethano ...
DOI:
10.1021/acs.jpcc.8b01698

48. A Co–N₄ moiety embedded into graphene as an efficient single-atom-catalyst for NO electrochemical reduction: a computational study

Author:
Zhongxu Wang; Jingxiang Zhao; Jingyang Wang; Carlos R. Cabrera; Zhongfang Chen
Source:
Journal of materials chemistry 2018 v.6 no.17 pp. 7547-7556
ISSN:
2050-7496
Subject:
ammonia; catalysts; density functional theory; electrochemistry; graphene; groundwater; moieties; nitric oxide; nitrous oxide; remediation
Abstract:
... Electrochemical reduction of nitric oxide (NOER) is a promising technology for the removal of harmful N-containing species in groundwater under mild conditions. In this work, by means of density functional theory computations, we systematically investigated the potential of utilizing experimentally feasible transition metal–N₄/graphenes as NOER catalysts. Our results revealed that NO molecules can ...
DOI:
10.1039/c8ta00875b

49. A Cu₂Se–Cu₂O film electrodeposited on titanium foil as a highly active and stable electrocatalyst for the oxygen evolution reaction

Author:
Hu Chen; Yan Gao; Lu Ye; Yanan Yao; Xuyang Chen; Yu Wei; Licheng Sun
Source:
Chemical communications 2018 v.54 no.39 pp. 4979-4982
ISSN:
1364-548X
Subject:
X-ray diffraction; X-ray photoelectron spectroscopy; anodes; buffers; carbonates; catalysts; cupric oxide; cuprous oxide; durability; electrolysis; foil; nanoparticles; oxidation; oxygen production; pH; titanium; transmission electron microscopy
Abstract:
... Many nonprecious metal-selenide-based materials have been reported as electrocatalysts with high activity for the oxygen evolution reaction (OER). Herein, a hybrid catalyst film composed of Cu₂Se and Cu₂O nanoparticles directly grown on Ti foil (Cu₂Se–Cu₂O/TF) was prepared through a simple and fast cathodic electrodeposition method. Surprisingly, this electrode required a relatively low overpotent ...
DOI:
10.1039/c8cc02021c

50. A DFT Study on the Catalytic CO Oxidative Coupling to Dimethyl Oxalate on Al-Doped Core–Shell Pd Clusters

Author:
Xue Feng; Lixia Ling; Yueting Cao; Riguang Zhang; Maohong Fan; Baojun Wang
Source:
Journal of physical chemistry 2018 v.122 no.2 pp. 1169-1179
ISSN:
1932-7455
Subject:
catalysts; density functional theory; oxalates; physical chemistry
Abstract:
... A series of core–shell catalysts aiming at CO oxidative coupling to dimethyl oxalate (DMO) were constructed, and effects of the second metal doping and surface structures on the reaction activity and favorable reaction path were investigated by using the density functional theory (DFT) method. Pd₁₃, Al@Pd₁₂, and Ag@Pd₁₂ were first studied to find the proper doping metal. Our results showed that th ...
DOI:
10.1021/acs.jpcc.7b09272

51. A Dynamic Heterogeneous Dispersion Model Evaluates Performance of Industrial Catalytic Hydrotreating Systems

Author:
Abbas Azarpour; Sohrab Zendehboudi
Source:
Industrial & engineering chemistry process design and development 2018 v.57 no.24 pp. 8267-8282
ISSN:
1520-5045
Subject:
carbon; catalysts; differential equation; mixing; model validation; models; oxidation; palladium; particle size; porosity; process design; purification methods; temperature; xylene
Abstract:
... Catalyst deactivation is one of the main challenges in industrial reaction operations. In this paper, a dynamic heterogeneous model is developed for the crude terephthalic acid hydropurification process. The model incorporates the effects of axial mixing and deactivation of the commercial catalyst of palladium supported on carbon on efficiency of the hydropurification operation. The transport phen ...
DOI:
10.1021/acs.iecr.8b01135

52. A Facile Synthetic Route to Multifunctional Poly(3-hexylthiophene)-b-poly(phenyl isocyanide) Copolymers: From Aggregation-Induced Emission to Controlled Helicity

Author:
Lei Xu; Xun-Hui Xu; Na Liu; Hui Zou; Zong-Quan Wu
Source:
Macromolecules 2018 v.51 no.19 pp. 7546-7555
ISSN:
1520-5835
Subject:
amines; annealing; catalysts; composite polymers; copolymerization; crosslinking; methanol; moieties; nickel; toluene
Abstract:
... New synthetic methods are of great significance in enabling access to valuable compounds and materials. Although conjugated poly(3-hexylthiophene) (P3HT) has been widely investigated, P3HT copolymers containing functional groups (such as amino, imino, hydroxyl, etc.) are rarely reported because of inherent synthetic difficulties. Here P3HT copolymers bearing diverse functional pendants, which cann ...
DOI:
10.1021/acs.macromol.8b01478

53. A Facile and Scalable Route to the Preparation of Catalytic Membranes with in Situ Synthesized Supramolecular Dendrimer Particle Hosts for Pt(0) Nanoparticles Using a Low-Generation PAMAM Dendrimer (G1-NH₂) as Precursor

Author:
Madhusudhana Rao Kotte; Alex T. Kuvarega; Siddulu N. Talapaneni; Manki Cho; Ali Coskun; Mamadou S. Diallo
Source:
ACS applied materials & interfaces 2018 v.10 no.39 pp. 33238-33251
ISSN:
1944-8252
Subject:
agrochemicals; alkynes; ambient temperature; binding capacity; borohydrides; catalysts; catalytic activity; copper; cyclohexanes; cyclohexenes; dendrimers; drugs; encapsulation; epichlorohydrins; hydrogen; hydrogenation; industry; models; reducing agents; solvents; thermoplastics
Abstract:
... Since the first reports of Cu dendrimer-encapsulated nanoparticles (DENs) published in 1998, the dendrimer-templating method has become the best and most versatile method for preparing ultrafine metallic and bimetallic nanoparticles (1–3 nm) with well-defined compositions, high catalytic activity, and tunable selectivity. However, DENs have remained for the most part model systems with limited pro ...
DOI:
10.1021/acsami.8b11351

54. A Fully Noble Metal-Free Photosystem Based on Cobalt-Polyoxometalates Immobilized in a Porphyrinic Metal–Organic Framework for Water Oxidation

Author:
Grégoire Paille; Maria Gomez-Mingot; Catherine Roch-Marchal; Benedikt Lassalle-Kaiser; Pierre Mialane; Marc Fontecave; Caroline Mellot-Draznieks; Anne Dolbecq
Source:
Journal of the American Chemical Society 2018 v.140 no.10 pp. 3613-3618
ISSN:
1520-5126
Subject:
catalysts; coordination polymers; oxidation; photocatalysis; photosensitizing agents; porphyrins; zirconium
Abstract:
... The sandwich-type polyoxometalate (POM) [(PW₉O₃₄)₂Co₄(H₂O)₂]¹⁰– was immobilized in the hexagonal channels of the Zr(IV) porphyrinic MOF-545 hybrid framework. The resulting composite was fully characterized by a panel of physicochemical techniques. Calculations allowed identifying the localization of the POM in the vicinity of the Zr₆ clusters and porphyrin linkers constituting the MOF. The materia ...
DOI:
10.1021/jacs.7b11788

55. A General Strategy for Aliphatic C–H Functionalization Enabled by Organic Photoredox Catalysis

Author:
Kaila A. Margrey; William L. Czaplyski; David A. Nicewicz; Erik J. Alexanian
Source:
Journal of the American Chemical Society 2018 v.140 no.12 pp. 4213-4217
ISSN:
1520-5126
Subject:
alkanes; carbon-hydrogen bond activation; catalysts; catalytic activity; chemical bonding; derivatization; hydrogen; irradiation; phosphates; redox reactions
Abstract:
... Synthetic transformations that functionalize unactivated aliphatic C–H bonds in an intermolecular fashion offer unique strategies for the synthesis and late-stage derivatization of complex molecules. Herein we report a general approach to the intermolecular functionalization of aliphatic C–H bonds using an acridinium photoredox catalyst and phosphate salt under blue LED irradiation. This strategy ...
DOI:
10.1021/jacs.8b00592
PubMed:
29522330
PubMed Central:
PMC5891731

56. A High-Performance Ni/SiO₂ Prepared by the Complexed-Impregnation Method with Citric Acid for Carbon Dioxide Reforming of Methane

Author:
Hua-Ping Ren; Qing-Qing Hao; Si-Yi Ding; Yu-Zhen Zhao; Min Zhu; Shao-Peng Tian; Qiang Ma; Wen-Qi Song; Zongcheng Miao; Zhao-Tie Liu
Source:
Industrial & engineering chemistry process design and development 2018 v.57 no.48 pp. 16257-16263
ISSN:
1520-5045
Subject:
carbon dioxide; catalysts; citric acid; methane; nickel; process design; silica; temperature
Abstract:
... A group of Ni/SiO₂ catalysts was prepared via the complexed-impregnation method with different amounts of citric acid (Ni–C/SiO₂). The Ni–C/SiO₂ and Ni/SiO₂ prepared by the conventional impregnation method were respectively tested for carbon dioxide reforming of methane (CDR) at CO₂/CH₄ = 1.0, a gas hourly space velocity of 60 000 mL·g–¹·h–¹, and a reaction temperature of 750 °C. The characterizat ...
DOI:
10.1021/acs.iecr.8b03897

57. A Highly Reduced Ni–Li–Olefin Complex for Catalytic Kumada–Corriu Cross-Couplings

Author:
Lukas Nattmann; Sigrid Lutz; Pascal Ortsack; Richard Goddard; Josep Cornella
Source:
Journal of the American Chemical Society 2018 v.140 no.42 pp. 13628-13633
ISSN:
1520-5126
Subject:
catalysts; catalytic activity; chemical bonding; cross-coupling reactions; ions; ligands; nickel; olefin; temperature
Abstract:
... The catalytic activity of a highly reduced Ni catalyst in the context of a Kumada–Corriu cross-coupling has been studied. This nickel complex is characterized by its high electron density, stabilized by simple olefin ligands in combination with two Li ions. Landmark reactivity has been found with this precatalyst which operates at cryogenic temperatures, thus allowing the presence of sensitive fun ...
DOI:
10.1021/jacs.8b09849

58. A Highly Sensitive Photoelectrochemical Assay with Donor–Acceptor-Type Material as Photoactive Material and Polyaniline as Signal Enhancer

Author:
Tao Hu; Ying-Ning Zheng; Meng-Jie Li; Wen-Bin Liang; Ya-Qin Chai; Ruo Yuan
Source:
Analytical chemistry 2018 v.90 no.10 pp. 6096-6101
ISSN:
1520-6882
Subject:
analytical methods; aniline; catalysts; detection limit; electric current; electron transfer; hydrogen peroxide; manganese; nanomaterials; polymers; porphyrins; single-stranded DNA; thrombin
Abstract:
... In this work, a highly sensitive photoelectrochemical (PEC) assay was constructed based on a donor–acceptor (D–A)-type material, poly{4,8-bis[5-(2-ethylhexyl)thiophen-2-yl]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl-alt-3-fluoro-2-[(2-ethylhexyl)-carbonyl]thieno[3,4-b]thiophene-4,6-diyl} (PTB7-Th), as the photoactive material and polyaniline (PANI) in situ deposited on the surface of PTB7-Th as the si ...
DOI:
10.1021/acs.analchem.8b00093

59. A Linear Scaling Relation for CO Oxidation on CeO2-Supported Pd

Author:
Jin-Xun Liu; Yaqiong Su; Ivo A. W. Filot; Emiel J. M. Hensen
Source:
Journal of the American Chemical Society 2018 v.140 no.13 pp. 4580-4587
ISSN:
1520-5126
Subject:
Monte Carlo method; carbon monoxide; catalysts; catalytic activity; ceric oxide; density functional theory; energy; models; nanoparticles; oxidation; oxygen; sampling
Abstract:
... Resolving the structure and composition of supported nanoparticles under reaction conditions remains a challenge in heterogeneous catalysis. Advanced configurational sampling methods at the density functional theory level are used to identify stable structures of a Pd₈ cluster on ceria (CeO₂) in the absence and presence of O₂. A Monte Carlo method in the Gibbs ensemble predicts Pd-oxide particles ...
DOI:
10.1021/jacs.7b13624
PubMed:
29498273
PubMed Central:
PMC5890314

60. A Low-Dielectric Polymer Derived from a Biorenewable Phenol (Eugenol)

Author:
Xingrong Chen; Linxuan Fang; Xiaoyao Chen; Junfeng Zhou; Jiajia Wang; Jing Sun; Qiang Fang
Source:
ACS sustainable chemistry & engineering 2018 v.6 no.10 pp. 13518-13523
ISSN:
2168-0485
Subject:
ambient temperature; catalysts; eugenol; feedstocks; glass transition temperature; siloxanes; thermal expansion; thermal stability; water uptake
Abstract:
... A novel dielectric polysiloxane with low dielectric constants (<2.77) at frequencies ranging from 0.1 to 30.0 MHz was synthesized. The monomer was prepared from renewable eugenol using an extremely low amount of B(C₆F₅)₃ catalyst. After thermal curing, the polysiloxane displayed high thermostability with degradation onset and glass transition temperatures of 400 and 201 °C, respectively. The coeff ...
DOI:
10.1021/acssuschemeng.8b03594

61. A Membraneless Direct Isopropanol Fuel Cell (DIPAFC) Operated with a Catalyst-Selective Principle

Author:
Xingwen Yu; Long Cheng; Yuanyue Liu; Arumugam Manthiram
Source:
Journal of physical chemistry 2018 v.122 no.25 pp. 13558-13563
ISSN:
1932-7455
Subject:
acetone; ambient temperature; anodes; carbon dioxide; carbon nanotubes; catalysts; catalytic activity; cathodes; dehydrogenation; density functional theory; electrical conductivity; electrochemistry; formates; fuel cells; fuels; isopropyl alcohol; liquids; nanoparticles; nickel; oxidation; physical chemistry
Abstract:
... The concept of catalyst-selective membraneless direct liquid fuel cell (DLFC) has recently been proposed and has successfully been demonstrated with a number of alcohol or formate fuels. However, there is a critical anolyte-poisoning issue in the previous membraneless alkaline DLFC systems due to CO₂ formation upon the oxidation of liquid fuels. This study demonstrates a new membraneless DLFC syst ...
DOI:
10.1021/acs.jpcc.7b12535

62. A Molecular Silane-Derivatized Ru(II) Catalyst for Photoelectrochemical Water Oxidation

Author:
Lei Wu; Michael Eberhart; Animesh Nayak; M. Kyle Brennaman; Bing Shan; Thomas J. Meyer
Source:
Journal of the American Chemical Society 2018 v.140 no.44 pp. 15062-15069
ISSN:
1520-5126
Subject:
catalysts; catalytic activity; coatings; cross-coupling reactions; dissociation; electrochemistry; electrodes; ligands; oxidation; oxygen; pH; polymers; porous media; pyridines; ruthenium; silane; titanium dioxide
Abstract:
... Photoanodes in dye-sensitized photoelectrosynthesis cells integrate molecular chromophore/catalyst assemblies on mesoporous n-type metal oxide electrodes for light-driven water oxidation. One limitation for sustainable photoanodes is the stability of chromophore/catalyst assembly on electrode surfaces for long periods. Progress has been made in stabilizing chromophores based on atomic layer deposi ...
DOI:
10.1021/jacs.8b10132

63. A Multicomponent Electrosynthesis of 1,5-Disubstituted and 1-Aryl 1,2,4-Triazoles

Author:
Na Yang; Gaoqing Yuan
Source:
Journal of organic chemistry 2018 v.83 no.19 pp. 11963-11969
ISSN:
1520-6904
Subject:
alcohols; ambient temperature; ammonia; catalysts; chemical reactions; chemical structure; electrochemistry; electrosynthesis; hydrazines; iodine; nitrogen; organic chemistry; oxidants; reaction mechanisms; solvents; triazoles
Abstract:
... A novel electrochemical route has been developed for the synthesis of 1,5-disubstituted and 1-aryl 1,2,4-triazoles from aryl hydrazines, paraformaldehyde, NH₄OAc, and alcohols. In this multicomponent reaction system, alcohols act as solvents as well as reactants and NH₄OAc is used as the nitrogen source. With the assistance of reactive iodide radical or I₂ and NH₃ electrogenerated in situ, this pr ...
DOI:
10.1021/acs.joc.8b01808

64. A New Approach to Chemical Recycling of Polyamide 6.6 and Synthesis of Polyurethanes with Recovered Intermediates

Author:
Janusz Datta; Kamila Błażek; Marcin Włoch; Radosław Bukowski
Source:
Journal of polymers and the environment 2018 v.26 no.12 pp. 4415-4429
ISSN:
1566-2543
Subject:
catalysts; chemical degradation; ethylene glycol; glycolysis; mathematical models; polyamides; polyols; polyurethanes; recycling; rheology
Abstract:
... A new efficient method for the chemical decomposition of polyamide 6.6 by the glycolysis and amino-glycolysis processes was proposed. The glycolysis was conducted using the mass excess of ethylene glycol (EG) as a decomposing agent in the presence of a catalyst. Also, a mixture of EG and triethylenetetramine was used as another decomposing agent in the amino-glycolysis process. The described proce ...
DOI:
10.1007/s10924-018-1314-4

65. A New Class of Metal-Cyclam-Based Zirconium Metal–Organic Frameworks for CO2 Adsorption and Chemical Fixation

Author:
Jie Zhu; Pavel M. Usov; Wenqian Xu; Paula J. Celis-Salazar; Shaoyang Lin; Matthew C. Kessinger; Carlos Landaverde-Alvarado; Meng Cai; Ann M. May; Carla Slebodnick; Dunru Zhu; Sanjaya D. Senanayake; Amanda J. Morris
Source:
Journal of the American Chemical Society 2018 v.140 no.3 pp. 993-1003
ISSN:
1520-5126
Subject:
active sites; adsorption; carbon dioxide; catalysts; catalytic activity; coordination polymers; epoxides; ligands; pH; porosity; solvents; zirconium
Abstract:
... Metal–organic frameworks (MOFs) have shown great promise in catalysis, mainly due to their high content of active centers, large internal surface areas, tunable pore size, and versatile chemical functionalities. However, it is a challenge to rationally design and construct MOFs that can serve as highly stable and reusable heterogeneous catalysts. Here two new robust 3D porous metal-cyclam-based zi ...
DOI:
10.1021/jacs.7b10643

66. A Ni(OH)₂–PtO₂ hybrid nanosheet array with ultralow Pt loading toward efficient and durable alkaline hydrogen evolution

Author:
Lisi Xie; Xiang Ren; Qin Liu; Guanwei Cui; Ruixiang Ge; Abdullah M. Asiri; Xuping Sun; Qiuju Zhang; Liang Chen
Source:
Journal of materials chemistry 2018 v.6 no.5 pp. 1967-1970
ISSN:
2050-7496
Subject:
Gibbs free energy; adsorption; catalysts; density functional theory; dissociation; durability; electrochemistry; electrodes; hot water treatment; hydrogen; hydrogen production; nanosheets; nickel; potassium hydroxide
Abstract:
... The design and development of highly active electrocatalysts for the hydrogen evolution reaction (HER) in alkaline media is of significant importance. In this communication, we report the direct growth of an ultralow-Pt-content (Pt content: 5.1 wt%) Ni(OH)₂–PtO₂ hybrid nanosheet array on a Ti mesh (Ni(OH)₂–PtO₂ NS/Ti), carried out by hydrothermal treatment of a Ni(OH)₂ nanosheet array on a Ti mesh ...
DOI:
10.1039/c7ta09990h

67. A Ni-loaded, metal–organic framework–graphene composite as a precursor for in situ electrochemical deposition of a highly active and durable water oxidation nanocatalyst

Author:
Mohamed H. Hassan; Ahmed B. Soliman; Worood A. Elmehelmey; Arwa A. Abugable; Stavros G. Karakalos; Mady Elbahri; Abdou Hassanien; Mohamed H. Alkordi
Source:
Chemical communications 2018 v.55 no.1 pp. 31-34
ISSN:
1364-548X
Subject:
catalysts; coordination polymers; electrochemistry; graphene; nanoparticles; nickel; oxidation; oxygen production; pyrolysis
Abstract:
... A novel approach to construct a highly active and durable Ni(OH)₂ nanoparticle/graphene hybrid electrocatalyst for the oxygen-evolution reaction (OER) is reported. This approach utilized the Ni-loaded, graphene-supported, Zr–carboxylate metal–organic framework (UiO-66-NH₂-Ni@G) as a sacrificial pre-catalyst to engender the true catalyst in an electrochemical surface restructuring process. This has ...
DOI:
10.1039/c8cc07120a

68. A Novel Air Flooding Technology for Light Crude Oil Reservoirs Applied under Reservoir Conditions

Author:
Tengfei Wang; Jiexiang Wang; Weipeng Yang; Shem Kalitaani; Zhiyu Deng
Source:
Energy & fuels 2018 v.32 no.4 pp. 4942-4950
ISSN:
1520-5029
Subject:
additives; air; catalysts; oil fields; oils; oxidation; oxygen; oxygen consumption; petroleum; wells
Abstract:
... A novel air flooding technology based on catalyst-activated low-temperature oxidation (CLTO) has been researched by static and dynamic oxidation experiments and can be applied in light crude oil reservoirs under reservoir conditions to improve the safety and oil recovery of air flooding. The catalytic effect of additives on the oxidation behavior of three crude oils was researched. The changes in ...
DOI:
10.1021/acs.energyfuels.8b00302

69. A Novel Four-Way Plasma-Catalytic Approach for The After-Treatment of Diesel Engine Exhausts

Author:
Shuiliang Yao; Huanhuan Zhang; Xing Shen; Jingyi Han; Zuliang Wu; Xiujuan Tang; Hao Lu; Boqiong Jiang; Tomohiro Nozaki; Xuming Zhang
Source:
Industrial & engineering chemistry process design and development 2018 v.57 no.4 pp. 1159-1168
ISSN:
1520-5045
Subject:
calcium sulfate; carbon dioxide; carbon monoxide; catalysts; diesel engines; gases; gold; heat; hydrocarbons; nitrogen oxides; oxidation; particulates; process design
Abstract:
... This study proposes a novel four-way plasma-catalytic removal of particulate matter, nitrogen oxides, hydrocarbons, and carbon monoxide without external heating using a pulsed dielectric barrier discharge reactor combined with Au/CaSO₄/γ-Al₂O₃ catalyst balls. With the optimized amount of Au and CaSO₄, over 90% of particulate matter, 40% of nitrogen oxides, and nearly 100% of hydrocarbons were remo ...
DOI:
10.1021/acs.iecr.7b04166

70. A Novel Graphdiyne-Based Catalyst for Effective Hydrogenation Reaction

Author:
Han Shen; Yongjun Li; Zhiqiang Shi
Source:
ACS applied materials & interfaces 2018 v.11 no.3 pp. 2563-2570
ISSN:
1944-8252
Subject:
alcohols; aldehydes; carbon; catalysts; hydrogenation; ketones; nanoparticles; platinum
Abstract:
... The platinum nanoparticles (Pt NPs) hybrided with nanostructured carbon materials with high stability are important for catalyzing hydrogenation reaction. Here we reported the fabrication of ultrastable Pt NPs anchored on graphdiyne, in which the strong interactions induced by the porous graphdiyne can prevent the thermal migration of Pt nanoparticles on the graphdiyne surface, exploiting the stro ...
DOI:
10.1021/acsami.8b00566

71. A Novel Hierarchical RuNi/Al2O3–Carbon Nanotubes/Ni Foam Catalyst for Selective Removal of CO in H2-Rich Fuels

Author:
Dan Ping; Chaojie Dong; Hua Zhao; Xinfa Dong
Source:
Industrial & engineering chemistry process design and development 2018 v.57 no.16 pp. 5558-5567
ISSN:
1520-5045
Subject:
catalysts; catalytic activity; durability; foams; fuel cells; fuels; hydrogen; methane production; nanoparticles; nanotubes; nickel; process design; surface area; temperature; thermal conductivity; thermal stability
Abstract:
... A novel hierarchical RuNi/Al₂O₃–carbon nanotube/Ni foam (RuNi/Al₂O₃–CNTs/NF) catalyst is prepared from a RuNiAl-layered double hydroxide/CNTs/NF (RuLDH/CNTs/NF) precursor and applied in CO selective methanation (CO-SMET) for hydrogen purification. Results show that the RuNi/Al₂O₃–CNTs/NF hierarchical catalyst has an excellent catalytic performance toward CO-SMET (i.e., CO outlet concentration less ...
DOI:
10.1021/acs.iecr.8b00390

72. A Novel Redox Precipitation to Synthesize Au-Doped α-MnO2 with High Dispersion toward Low-Temperature Oxidation of Formaldehyde

Author:
Jin Chen; Dongxu Yan; Zhen Xu; Xi Chen; Wenjian Xu; Hongpeng Jia; Jing Chen
Source:
Environmental science & technology 2018 v.52 no.8 pp. 4728-4737
ISSN:
1520-5851
Subject:
Fourier transform infrared spectroscopy; active sites; ambient temperature; catalysts; catalytic activity; cleaning; environmental science; formaldehyde; gold; nanogold; oxidation; oxygen; streams
Abstract:
... A novel method of redox precipitation was applied for the first time to synthesize a Au-doped α-MnO₂ catalyst with high dispersion of the Au species. Au nanoparticles (NPs) can be downsized into approximate single atoms by this method, thereby realizing highly efficient utilization of Au element as well as satisfying low-temperature oxidation of formaldehyde (HCHO). Under catalysis of the optimal ...
DOI:
10.1021/acs.est.7b06039

73. A Palladium Iodide-Catalyzed Oxidative Aminocarbonylation–Heterocyclization Approach to Functionalized Benzimidazoimidazoles

Author:
Lucia Veltri; Salvatore V. Giofrè; Perry Devo; Roberto Romeo; Adrian P. Dobbs; Bartolo Gabriele
Source:
Journal of organic chemistry 2018 v.83 no.3 pp. 1680-1685
ISSN:
1520-6904
Subject:
Lewis bases; acetamides; amines; catalysts; chemical bonding; chemical structure; imidazoles; isomerization; organic chemistry; palladium
Abstract:
... A novel carbonylative approach to the synthesis of functionalized 1H-benzo[d]imidazo[1,2-a]imidazoles is presented. The method consists of the oxidative aminocarbonylation of N-substituted-1-(prop-2-yn-1-yl)-1H-benzo[d]imidazol-2-amines, carried out in the presence of secondary nucleophilic amines, to give the corresponding alkynylamide intermediates, followed by in situ conjugated addition and do ...
DOI:
10.1021/acs.joc.7b03167

74. A Perovskite Solar Cell with Enhanced Light Stability and High Photovoltaic Conversion Efficiencies

Author:
Quan Yang; Riccardo Dettori; Luke E. K. Achenie
Source:
ACS sustainable chemistry & engineering 2018 v.7 no.1 pp. 709-715
ISSN:
2168-0485
Subject:
solar cells; titanium dioxide; chemical engineering; catalysts; porous media; photostability; photoluminescence; ultraviolet radiation
Abstract:
... Owing to the remarkable advantages of the perovskite solar cell (PSC), people regard the PSC as an auspicious candidate for photovoltaic devices in the near future, but light instability of the PSC, caused by TiO₂ being a photo catalyst to decompose perovskite films under UV radiation, limits its practical applications. To improve light stability, removing the TiO₂ layer from PSC devices is the be ...
DOI:
10.1021/acssuschemeng.8b04281

75. A Pinch of Salt Improves n-Butanol Selectivity in the Guerbet Condensation of Ethanol over Cu-Doped Mg/Al Oxides

Author:
Jacob A. Barrett; Zachary R. Jones; Craig Stickelmaier; Nora Schopp; Peter C. Ford
Source:
ACS sustainable chemistry & engineering 2018 v.6 no.11 pp. 15119-15126
ISSN:
2168-0485
Subject:
X-ray diffraction; aluminum; aluminum oxide; butanol; butyrates; carbon; catalysts; copper; ethanol; ethyl acetate; feedstocks; fuels; hydrotalcite; industry; magnesium
Abstract:
... Improvement of processes that utilize renewable feedstocks to produce chemicals ordinarily derived from fossil carbon feedstocks is paramount to creating environmentally sustainable chemical and fuel industries. Catalytic conversion of biorefinery-derived ethanol via the Guerbet condensation has the potential to serve such a purpose. In this contribution, we demonstrate marked selectivity changes ...
DOI:
10.1021/acssuschemeng.8b03589

76. A Protocol for the Synthesis of CF2H-Containing Pyrazolo[1,5-c]quinazolines from 3-Ylideneoxindoles and in Situ Generated CF2HCHN2

Author:
Wen-Yong Han; Jian-Shu Wang; Jia Zhao; Lin Long; Bao-Dong Cui; Nan-Wei Wan; Yong-Zheng Chen
Source:
Journal of organic chemistry 2018 v.83 no.12 pp. 6556-6565
ISSN:
1520-6904
Subject:
ambient temperature; catalysts; dehydrogenation; moieties; organic chemistry; organic compounds; pharmaceutical industry; protocols
Abstract:
... Herein is disclosed a selective and facile approach for the construction of CF₂H-containing pyrazolo[1,5-c]quinazolines from easily accessible 3-ylideneoxindoles and in situ generated CF₂HCHN₂. The reaction involving a [3 + 2] cycloaddition/1,3-H shift/rearrangement/dehydrogenation cascade proceeded smoothly at room temperature in the absence of catalyst and additive. Moreover, this metal-free pro ...
DOI:
10.1021/acs.joc.8b00866

77. A Rational Design of Highly Controlled Suzuki–Miyaura Catalyst-Transfer Polycondensation for Precision Synthesis of Polythiophenes and Their Block Copolymers: Marriage of Palladacycle Precatalysts with MIDA-Boronates

Author:
Kyeong-Bae Seo; In-Hwan Lee; Jaeho Lee; Inho Choi; Tae-Lim Choi
Source:
Journal of the American Chemical Society 2018 v.140 no.12 pp. 4335-4343
ISSN:
1520-5126
Subject:
catalysts; composite polymers; condensation reactions; copolymerization; matrix-assisted laser desorption-ionization mass spectrometry; models; molecular weight; nuclear magnetic resonance spectroscopy; phosphorus; screening; stable isotopes
Abstract:
... Herein, we report a highly efficient Suzuki–Miyaura catalyst-transfer polycondensation (SCTP) of 3-alkylthiophenes using bench-stable but highly active Buchwald dialkylbiarylphospine Pd G3 precatalysts and N-methylimidodiacetic (MIDA)-boronate monomers. Initially, the feasibility of the catalyst-transfer process was examined by screening various dialkylbiarylphospine-Pd(0) species. After optimizin ...
DOI:
10.1021/jacs.7b13701

78. A Review on Recent Advances for Electrochemical Reduction of Carbon Dioxide to Methanol Using Metal–Organic Framework (MOF) and Non-MOF Catalysts: Challenges and Future Prospects

Author:
Fayez Nasir Al-Rowaili; Aqil Jamal; Mohammad S. Ba Shammakh; Azeem Rana
Source:
ACS sustainable chemistry & engineering 2018 v.6 no.12 pp. 15895-15914
ISSN:
2168-0485
Subject:
carbon dioxide; catalysts; catalytic activity; composite materials; coordination polymers; electrochemistry; energy density; fossil fuels; global warming; hydrogen; hydrogen production; metals; methanol; oxygen; renewable energy sources; surface area
Abstract:
... Transformation of carbon dioxide into various chemicals including methanol is a top priority field of study owing to the association of CO₂ with global warming. There is a need for renewable and sustainable energy sources and replacement of fossil fuel with a fuel having comparable energy density. Electrochemical reduction is a unique approach to convert CO₂ to methanol by employing alternative en ...
DOI:
10.1021/acssuschemeng.8b03843

79. A Revised Mechanism for the Kinugasa Reaction

Author:
Thomas C. Malig; Diana Yu; Jason E. Hein
Source:
Journal of the American Chemical Society 2018 v.140 no.29 pp. 9167-9173
ISSN:
1520-5126
Subject:
alkynes; beta-lactams; byproducts; catalysts; copper; cycloaddition reactions; kinetics; mechanistic models
Abstract:
... Detailed kinetic analysis for the Cu(I)-catalyzed Kinugasa reaction forming β-lactams has revealed an anomalous overall zero-order reaction profile, due to opposing positive and negative orders in nitrone and alkyne, respectively. Furthermore, the reaction displays a second-order dependence on the catalyst, confirming the critical involvement of a postulated bis-Cu complex. Finally, reaction progr ...
DOI:
10.1021/jacs.8b04635

80. A Robust One-Step Approach to Ynamides

Author:
Yongliang Tu; Xianzhu Zeng; Hui Wang; Junfeng Zhao
Source:
Organic letters 2018 v.20 no.1 pp. 280-283
ISSN:
1523-7052
Subject:
air; amides; catalysts; chemical reactions; chemical structure
Abstract:
... A robust one-step synthetic strategy for ynamide with cheap and easily available stock chemicals vinyl dichlorides and electron deficient amides as the starting material is described. In the absence of transition-metal catalyst, the reaction proceeds under mild reaction conditions in open air and thus rendering a convenient operation. This strategy is not only suitable for both terminal and intern ...
DOI:
10.1021/acs.orglett.7b03665

81. A Scalable Upgrading of Concentrated Furfural in Ethanol: Combining Meerwein–Ponndorf–Verley Reduction with in Situ Cross Aldol Condensation

Author:
Gang Li; Wenqian Jiao; Zhen Sun; Yang Zhao; Zhangping Shi; Yueer Yan; Lei Feng; Yahong Zhang; Yi Tang
Source:
ACS sustainable chemistry & engineering 2018 v.6 no.3 pp. 4316-4320
ISSN:
2168-0485
Subject:
Lewis acids; acrolein; catalysts; condensation reactions; ethanol; furfural; furfuryl alcohol; solubility; zeolites
Abstract:
... Currently, the catalytic upgrade of biomass-derived platform molecules into valuable chemicals is of great interest. In this work, an integrated route for upgrading concentrated furfural (17.3–80.5 wt %) in ethanol through the combination of Meerwein–Ponndorf–Verley reduction with in situ cross aldol condensation is developed, and the two valuable products, furfuryl alcohol and 3-(2-furyl)acrolein ...
DOI:
10.1021/acssuschemeng.7b04770

82. A Screen for Membrane Fission Catalysts Identifies the ATPase EHD1

Author:
Sukrut C. Kamerkar; Krishnendu Roy; Soumya Bhattacharyya; Thomas J. Pucadyil
Source:
Biochemistry 2018 v.58 no.1 pp. 65-71
ISSN:
1520-4995
Subject:
adenosinetriphosphatase; biogenesis; brain; catalysts; cell division; cleavage (chemistry); cytosol; dynamins; fractionation; guanosine triphosphate; synaptic transmission
Abstract:
... Membrane fission manifests during cell division, synaptic transmission, vesicular transport, and organelle biogenesis, yet identifying proteins that catalyze fission remains a challenge. Using a facile and robust assay system of supported membrane tubes in a microscopic screen that directly monitors membrane tube scission, we detect robust GTP- and ATP-dependent as well as nucleotide-independent f ...
DOI:
10.1021/acs.biochem.8b00925
PubMed:
30403133
PubMed Central:
PMC6327249

83. A Self-Healable High Glass Transition Temperature Bioepoxy Material Based on Vitrimer Chemistry

Author:
Tuan Liu; Cheng Hao; Shuai Zhang; Xiaoning Yang; Liwei Wang; Jiarui Han; Yuzhan Li; Junna Xin; Jinwen Zhang
Source:
Macromolecules 2018 v.51 no.15 pp. 5577-5585
ISSN:
1520-5835
Subject:
anhydrides; bisphenol A; catalysts; crosslinking; epoxides; glass transition temperature; polymers; stress relaxation; transesterification; zinc
Abstract:
... The design of high glass transition temperature (Tg) thermoset materials with considerable reparability is a challenge. In this study, a novel biobased triepoxy (TEP) is synthesized and cured with an anhydride monomer in the presence of zinc catalyst. The cured TEP exhibits a high Tg (187 °C) and comparable strength and modulus to the cured bisphenol A epoxy. By adopting the vitrimer chemistry, th ...
DOI:
10.1021/acs.macromol.8b01010

84. A Spatially Confined gC3N4–Pt Electrocatalyst with Robust Stability

Author:
Kun Cheng; Kang Zhu; Shengli Liu; Mengxue Li; Jinhua Huang; Lihuan Yu; Zhuo Xia; Chang Zhu; Xiaobo Liu; Wenhui Li; Wangting Lu; Feng Wei; Youhua Zhou; Wanquan Zheng; Shichun Mu
Source:
ACS applied materials & interfaces 2018 v.10 no.25 pp. 21306-21312
ISSN:
1944-8252
Subject:
carbon nitride; catalysts; electrochemistry; electrolytes; electron transfer; energy conversion; fuel cells; graphene; mass transfer; methanol; models; nanoparticles; nanospheres; oxidation; polymers; surface area
Abstract:
... Metal catalysts (e.g., Pt) have a variety of applications in energy conversion devices including polymer electrolyte fuel cells (PEFCs); however, they commonly confront a crucial issue of poor stability. Herein, a structural model of spatially confining supported Pt nanoparticles is determined to improve the stability of metal catalysts, wherein graphitic carbon nitride (gC₃N₄) supported Pt nanopa ...
DOI:
10.1021/acsami.8b03832

85. A Spectroscopic Study on the Nitrogen Electrochemical Reduction Reaction on Gold and Platinum Surfaces

Author:
Yao Yao; Shangqian Zhu; Haijiang Wang; Hui Li; Minhua Shao
Source:
Journal of the American Chemical Society 2018 v.140 no.4 pp. 1496-1501
ISSN:
1520-5126
Subject:
ammonia; catalysts; electrochemistry; electrodes; gold; hydrogen; hydrogen production; infrared spectroscopy; nitrogen; platinum; reaction mechanisms; spectral analysis
Abstract:
... The electrochemical reduction of nitrogen to ammonia on Au-based catalysts showed a reasonably high Coulombic efficiency. The pathway of this promising reaction, however, is not clear partially due to the lack of information on reaction intermediates. Herein, surface-enhanced infrared absorption spectroscopy (SEIRAS) was employed to study the reaction mechanisms of nitrogen reduction on an Au thin ...
DOI:
10.1021/jacs.7b12101

86. A Structured Cu-Based/γ-Al2O3/Al Multifunctional Catalyst for Steam Reforming of Dimethyl Ether: Investigation on in-Situ CO Reduction Strategy

Author:
Feiyue Fan; Qi Zhang; Hong Hou
Source:
Industrial & engineering chemistry process design and development 2018 v.57 no.6 pp. 2426-2433
ISSN:
1520-5045
Subject:
catalysts; catalytic activity; copper; iron; physicochemical properties; process design; steam; temperature
Abstract:
... A plate-type Cu/Ni/γ-Al₂O₃/Al catalyst exhibited a good stability in steam reforming of dimethyl ether (DME SR); however, a high CO concentration (ca. 26%) was detected. As such, a multifunctional catalyst combined DME SR and high temperature water gas shift reaction (HT-WGSR) was developed in this work. It is found that the reaction temperature regions of Fe-based and Cu-based catalysts coupled p ...
DOI:
10.1021/acs.iecr.7b04896

87. A Study on Durable Flame Retardancy of Jute

Author:
P. K. Roy; S. Mukhopadhyay; B. S. Butola
Source:
Journal of natural fibers 2018 v.15 no.4 pp. 483-495
ISSN:
1544-046X
Subject:
catalysts; chlorides; differential scanning calorimetry; durability; fabrics; flame retardants; flammability; formaldehyde; jute; melamine; oxygen; phosphoric acid; temperature; thermal properties; thermogravimetry
Abstract:
... Flame retardancy was imparted to jute fabric through application of organophosphorus flame retardants (OFR) and tetrakis (hydroxymethyl) phosphonium chloride (THPC). The OFR agent was used in conjunction with melamine formaldehyde as binder and phosphoric acid as a catalyst. THPC was applied in the form of a THPC-urea complex. Both the flame retardants were applied to scoured and bleached jute hes ...
DOI:
10.1080/15440478.2015.1029190

88. A Sustainable Approach for the Synthesis of Catalytically Active Peroxidase-Mimic ZnS Catalysts

Author:
Camilla M. Cova; Alessio Zuliani; Mario J. Muñoz-Batista; Rafael Luque
Source:
ACS sustainable chemistry & engineering 2018 v.7 no.1 pp. 1300-1307
ISSN:
2168-0485
Subject:
X-ray diffraction; X-ray photoelectron spectroscopy; benzaldehyde; benzyl alcohol; carbon; carcinogens; catalysts; catalytic activity; energy-dispersive X-ray analysis; hydrogen peroxide; microwave radiation; models; nitrogen; oxidants; oxidation; peroxidase; photochemistry; scanning electron microscopy; setae (animal); sulfur; surface area; swine; thiourea; toluene; toxicity; zinc sulfide
Abstract:
... Zinc sulfides are emerging as promising catalysts in different fields such as photochemistry or organic synthesis. Nevertheless, the synthesis of ZnS compounds normally requires the utilization of toxic sulfur precursors, e.g., thiourea which is a contaminant and carcinogenic agent. As a result, new green and sustainable synthetic methodologies are needed. Herein, an innovative, simple, and cheap ...
DOI:
10.1021/acssuschemeng.8b04968

89. A Thiourea Tether in the Second Coordination Sphere as a Binding Site for CO₂ and a Proton Donor Promotes the Electrochemical Reduction of CO₂ to CO Catalyzed by a Rhenium Bipyridine-Type Complex

Author:
Eynat Haviv; Dima Azaiza-Dabbah; Raanan Carmieli; Liat Avram; Jan M. L. Martin; Ronny Neumann
Source:
Journal of the American Chemical Society 2018 v.140 no.39 pp. 12451-12456
ISSN:
1520-5126
Subject:
binding sites; carbon dioxide; carboxylic acids; catalysts; catalytic activity; electrochemistry; enzymes; histidine; hydrogen; hydrogen bonding; isotopes; ligands; moieties; nuclear magnetic resonance spectroscopy; oxygen; rhenium; thiourea
Abstract:
... The electrochemical reduction of CO₂ has been extensively investigated in recent years, with the expectation that a detailed mechanistic understanding could achieve the goal of finding a stable catalyst with high turnover frequencies and low reduction potentials. In the catalytic cycle of the carbon dioxide hydrogenase enzyme, it has been suggested that the reduced metal center reacts with CO₂ to ...
DOI:
10.1021/jacs.8b05658

90. A Two-Step Procedure for the Overall Transamidation of 8-Aminoquinoline Amides Proceeding via the Intermediate N-Acyl-Boc-Carbamates

Author:
Oscar Verho; Monireh Pourghasemi Lati; Michael Oschmann
Source:
Journal of organic chemistry 2018 v.83 no.8 pp. 4464-4476
ISSN:
1520-6904
Subject:
amides; amines; aminolysis; aminoquinolines; carbon-hydrogen bond activation; catalysts; chemical structure; organic chemistry; protocols
Abstract:
... Herein a two-step strategy for achieving overall transamidation of 8-aminoquinoline amides has been explored. In this protocol, the 8-aminoquinoline amides were first treated with Boc₂O and DMAP to form the corresponding N-acyl-Boc-carbamates, which were found to be sufficiently reactive to undergo subsequent aminolysis with different amines in the absence of any additional reagents or catalysts. ...
DOI:
10.1021/acs.joc.8b00174

91. A bifunctional and stable Ni–Co–S/Ni–Co–P bistratal electrocatalyst for 10.8%-efficient overall solar water splitting

Author:
Xiaoxue Zhou; Ju Zhou; Guanping Huang; Ronglei Fan; Sheng Ju; Zetian Mi; Mingrong Shen
Source:
Journal of materials chemistry 2018 v.6 no.41 pp. 20297-20303
ISSN:
2050-7496
Subject:
catalysts; cost effectiveness; electrochemistry; electrolysis; foams; hydrogen production; nickel; oxygen production; silicon; solar cells
Abstract:
... Stable and cost-effective catalysts with low kinetic overpotentials for both the anodic oxygen evolution reaction (OER) and cathodic hydrogen evolution reaction (HER) are indispensable for the large-scale implementation of electrochemical water splitting. In this study, we developed an efficient, stable and bifunctional Ni–Co–S/Ni–Co–P bistratal electrocatalyst on Ni foam (NF) using simple electro ...
DOI:
10.1039/c8ta07197g

92. A bifunctional catalyst for efficient dehydrogenation and electro-oxidation of hydrazine

Author:
Jun Wang; Asim Khaniya; Lin Hu; Melanie J. Beazley; William E. Kaden; Xiaofeng Feng
Source:
Journal of materials chemistry 2018 v.6 no.37 pp. 18050-18056
ISSN:
2050-7496
Subject:
catalysts; dehydrogenation; durability; electricity generation; energy density; fuel cells; fuels; hydrazine; hydrogen; hydrogen production; nanoparticles; nickel; palladium; platinum
Abstract:
... The chemical energy stored in energetic materials may often be utilized in various ways, which motivates the development of multifunctional catalysts for flexible and efficient utilization of the chemical energy. Hydrazine is a promising energy carrier due to its high energy density and high hydrogen content, which can be utilized as a chemical hydrogen storage medium or a fuel for direct fuel cel ...
DOI:
10.1039/c8ta06219f

93. A carbon nanotube/carbonaceous foam composite: simple preparation and potential application

Author:
Hong Lei; Qi Cheng
Source:
Journal of materials science 2018 v.53 no.18 pp. 12860-12870
ISSN:
0022-2461
Subject:
carbon nanotubes; catalysts; cell walls; foams; nickel; surface area
Abstract:
... The combination of carbonaceous foams (CFs) and carbon nanotubes (CNTs) is considered a viable strategy to take advantage of the merits of these two materials. Most of the reported CF–CNT composite embedded the CNTs in the framework of CFs, which may conceal some unique properties of the CNTs. In the present work, CNTs were successfully deposited on the ultra-thin cell walls of a starch-derived CF ...
DOI:
10.1007/s10853-018-2599-3

94. A catalyst-free, waste-less ethanol-based solvothermal synthesis of amides

Author:
Francesca Dalu; Mariano A. Scorciapino; Claudio Cara; Alberto Luridiana; Anna Musinu; Mariano Casu; Francesco Secci; Carla Cannas
Source:
Green chemistry 2018 v.20 no.2 pp. 375-381
ISSN:
1463-9270
Subject:
amides; amines; carboxylic acids; catalysts; ethanol; green chemistry
Abstract:
... A green, one-pot approach based on the solvothermal amidation of carboxylic acids with amines has been developed for the synthesis of diverse aliphatic and aromatic amides. It does not require the use of catalysts or coupling reagents and it occurs in the presence of ethanol that has been proved to have a key role in the process. The proposed strategy is also extendable to biologically active amid ...
DOI:
10.1039/c7gc02967e

95. A catalytic, catalyst-free, and roll-to-roll production of graphene via chemical vapor deposition: Low temperature growth

Author:
Samira Naghdi; Kyong Yop Rhee; Soo Jin Park
Source:
Carbon 2018 v.127 pp. 1-12
ISSN:
0008-6223
Subject:
catalysts; graphene; nanomaterials; temperature; vapors
Abstract:
... The application of graphene as a two-dimensional nano-material has gained wide interest in different research areas, but its use is still novel for scientists. There has been continuous progress in the development of different synthesis methods to readily produce graphene at a lower cost. Chemical vapor deposition (CVD) is a powerful process to produce graphene, and it is accompanied by other meth ...
DOI:
10.1016/j.carbon.2017.10.065

96. A cell interaction phenomenon in a multi-cell stack under one cell suffering fuel starvation

Author:
Zunyan Hu; Liangfei Xu; Jianqiu Li; Junming Hu; Xin Xu; Xiaoli Du; Weihua Sun; Minggao Ouyang
Source:
Energy conversion and management 2018 v.174 pp. 465-474
ISSN:
0196-8904
Subject:
fuel cells; longevity; contact angle; cathodes; monitoring; corrosion; models; catalysts; fuels; scanning electron microscopy; transmission electron microscopy; anodes; starvation
Abstract:
... Cell interaction is the main factor resulting in a shorter lifespan for multi-cell stacks than for a single fuel cell stack. To explain this mechanism, we propose a cell interaction phenomenon in which one cell experiences fuel starvation. A specific voltage distribution along the straight channel direction has been observed with an innovative multipoint monitoring method. This phenomenon also can ...
DOI:
10.1016/j.enconman.2018.08.062

97. A chiral organic base catalyst with halogen-bonding-donor functionality: asymmetric Mannich reactions of malononitrile with N-Boc aldimines and ketimines

Author:
Satoru Kuwano; Takumi Suzuki; Yusei Hosaka; Takayoshi Arai
Source:
Chemical communications 2018 v.54 no.31 pp. 3847-3850
ISSN:
1364-548X
Subject:
aldimines; catalysts; chemical reactions; ketimines
Abstract:
... A chiral organic base catalyst with halogen-bonding-donor functionality has been developed. This quinidine-derived acid/base catalyst smoothly promoted the asymmetric Mannich reaction of malononitrile and various N-Boc imines with up to 98% ee. The cooperative interaction with both substrates was responsible for the high activity that allowed a reduction of the catalyst amount to 0.5 mol%. ...
DOI:
10.1039/c8cc00865e

98. A clean approach for the reduction of hazardous 4-nitrophenol using gold nanoparticles decorated multiwalled carbon nanotubes

Author:
Abdullah A. Al-Kahtani; Turki Almuqati; Norah Alhokbany; Tansir Ahamad; Mu. Naushad; Saad M. Alshehri
Source:
Journal of cleaner production 2018 v.191 pp. 429-435
ISSN:
0959-6526
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; X-ray photoelectron spectroscopy; aminophenols; borohydrides; carbon nanotubes; catalysts; electrochemistry; electrodes; human health; hydrogels; nanocomposites; nanogold; p-nitrophenol; pollutants; transmission electron microscopy
Abstract:
... 4-Nitrophenol (4-NP) has become anthropogenic pollutant and poses a threat to the environment and human health. The fast detection and reduction of 4-NP can reduced their environmental and health issues. In this study, we have prepared the spherical shaped gold nanoparticles (AuNPs) decorated multi-walled carbon nanotubes (MWCNTs) in the hydrogel matrix. The prepared nanocomposite (Au@MWCNTs) was ...
DOI:
10.1016/j.jclepro.2018.04.197

99. A cleaner process for biodiesel production from waste cooking oil using waste materials as a heterogeneous catalyst and its kinetic study

Author:
Meilana Dharma Putra; Chairul Irawan; Udiantoro; Yuli Ristianingsih; Iryanti Fatyasari Nata
Source:
Journal of cleaner production 2018 v.195 pp. 1249-1258
ISSN:
0959-6526
Subject:
activation energy; biodiesel; calcium oxide; catalysts; clay; cooking fats and oils; egg shell; esterification; fuel production; kitchen waste; peat; prices; reaction mechanisms; silica; temperature; transesterification
Abstract:
... Utilization of heterogeneous catalyst in the biodiesel production process can minimize the cost of separation process and subsequently reduce the biodiesel price. This study aims at developing a low-priced heterogeneous catalyst CaO/SiO₂ prepared from cheap and abundant wastes of eggshell and peat clay for the production of biodiesel from wasted cooking oil. CaO catalyst was capable to produce bio ...
DOI:
10.1016/j.jclepro.2018.06.010

100. A cobalt catalyst for reductive etherification of 5-hydroxymethyl-furfural to 2,5-bis(methoxymethyl)furan under mild conditions

Author:
Xing-Long Li; Kun Zhang; Shi-Yan Chen; Chuang Li; Feng Li; Hua-Jian Xu; Yao Fu
Source:
Green chemistry 2018 v.20 no.5 pp. 1095-1105
ISSN:
1463-9270
Subject:
X-ray diffraction; X-ray photoelectron spectroscopy; atomic absorption spectrometry; catalysts; cobalt; cobalt oxide; green chemistry; hydrogen; hydroxymethylfurfural; mass transfer; nuclear magnetic resonance spectroscopy; reaction mechanisms; scanning electron microscopy; temperature; transmission electron microscopy
Abstract:
... Conversion of platform molecule 5-hydroxymethylfurfural (HMF) into high-value-added derivatives has attracted significant interest. In this paper, a metallic cobalt catalyst was prepared by the simple reduction of commercially available Co₃O₄, and used to catalyze the reductive etherification of HMF to 2,5-bis(methoxymethyl)furan (BMMF) under mild conditions. A yield of 93% 2,5-bis(hydroxymethyl)f ...
DOI:
10.1039/c7gc03072j