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You searched for: Journal name Journal of catalysis Remove constraint Journal name: Journal of catalysis Publication year rev 7982-2018 Remove constraint Publication year rev: 7982-2018 Source 2018 v.364 Remove constraint Source: 2018 v.364
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1. 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

2. Aerobic oxidation of alkanes on icosahedron gold nanoparticle Au55

Author:
Aleksandar Staykov; Tetsuya Miwa; Kazunari Yoshizawa
Source:
Journal of catalysis 2018 v.364 pp. 141-153
ISSN:
0021-9517
Subject:
alcohols; catalysts; catalytic activity; cleavage (chemistry); cyclohexanes; density functional theory; dissociation; ethane; hydroxylation; ketones; methane; nanogold; oxidation; oxygen; propane; reaction mechanisms; temperature
Abstract:
... Aerobic oxidation of cyclohexane, propane, ethane, and methane to the corresponding alcohols was investigated over an Au55 gold nanoparticle with icosahedron symmetry using density functional theory. Reaction mechanisms were elucidated and activation barriers for catalytic CH bond cleavage and corresponding alcohols’ formation were estimated. Furthermore, on the basis of the reaction rate constant ...
DOI:
10.1016/j.jcat.2018.05.017

3. Catalytic thiophene oxidation by groups 4 and 5 framework-substituted zeolites with hydrogen peroxide: Mechanistic and spectroscopic evidence for the effects of metal Lewis acidity and solvent Lewis basicity

Author:
Daniel T. Bregante; Ami Y. Patel; Alayna M. Johnson; David W. Flaherty
Source:
Journal of catalysis 2018 v.364 pp. 415-425
ISSN:
0021-9517
Subject:
Lewis acids; Lewis bases; acetone; acetonitrile; acidity; active sites; adsorption; dioxane; enthalpy; ethanol; fossils; hydrogen peroxide; methanol; models; oxidation; oxygen; solvents; spectral analysis; sulfides; thiophene; zeolites; zirconium
Abstract:
... Group 4 (Ti and Zr) and 5 (Nb and Ta) atoms substituted into the *BEA zeolite framework (M-BEA) irreversibly activate hydrogen peroxide (H₂O₂) and form pools of metal-hydroperoxide (M-OOH) and peroxide (M-(η²-O₂)) intermediates active for the oxidation of 2,5-dimethylthiophene (C₆H₈S), a model reactant representative of organosulfur species in fossil reserves and chemical weapons. Sequential oxida ...
DOI:
10.1016/j.jcat.2018.06.009

4. Crystallization of ATO silicoaluminophosphates nanocrystalline spheroids using a phase-transfer synthetic strategy for n-heptane hydroisomerization

Author:
Tao Yue; Wei Liu; Liyuan Li; Xiaoling Zhao; Kake Zhu; Xinggui Zhou; Weimin Yang
Source:
Journal of catalysis 2018 v.364 pp. 308-327
ISSN:
0021-9517
Subject:
acidity; catalytic activity; crystallization; emulsions; heptane; ingredients; isomers; nanocrystals; silica; surface area; temperature; toluene
Abstract:
... Changing size and shape of zeolitic crystals brings about enhanced diffusion properties and related promotion of catalytic performances. This work puts forward a phase-transfer synthetic strategy to generate ATO nanocrystalline silicoaluminophosphates spheroids under tumbling crystallization using aluminum isopropoxide dissolved in toluene and other ingredients (fumed silica/phosphoric acid/Di-n-h ...
DOI:
10.1016/j.jcat.2018.06.003

5. Does hierarchical structure affect the shape selectivity of zeolites? Example of transformation of n-hexane in hydroisomerization

Author:
Petr Sazama; Jana Pastvova; Dalibor Kaucky; Jaroslava Moravkova; Jiri Rathousky; Ivo Jakubec; Galina Sadovska
Source:
Journal of catalysis 2018 v.364 pp. 262-270
ISSN:
0021-9517
Subject:
hexane; isomerization; isomers; models; porous media; zeolites
Abstract:
... The large mesoporous surfaces of hierarchical zeolites without confinement of the active sites leads to the question of whether the shape selectivity of these zeolites is essentially altered. The hydroisomerization of n-hexane to mono- and dibranched C₆ isomers was carried out as a model reaction governed by the shape selectivity to obtain insight into the effects of the secondary mesoporous struc ...
DOI:
10.1016/j.jcat.2018.05.010

6. Effects of divalent metal ions of hydrotalcites on catalytic behavior of supported gold nanocatalysts for chemoselective hydrogenation of 3-nitrostyrene

Author:
Yuan Tan; Xiao Yan Liu; Lin Li; Leilei Kang; Aiqin Wang; Tao Zhang
Source:
Journal of catalysis 2018 v.364 pp. 174-182
ISSN:
0021-9517
Subject:
Fourier transform infrared spectroscopy; adsorption; aniline; catalysts; catalytic activity; chemoselectivity; divalent metals; gold; hydrogen; hydrogenation; hydrotalcite; magnesium; metal ions; nanogold; nanoparticles; nickel; particle size; zinc
Abstract:
... The effect of the divalent metal ions on the hydrotalcite (HT) (MAl-HT; M = Mg, Zn, Ni)-supported thiolated Au₂₅ nanoclusters (NCs) as the precatalysts for the chemoselective hydrogenation of 3-nitrostyrene to 3-vinylaniline was investigated. The highest chemoselectivity was obtained over the Au₂₅/ZnAl-HT-300 (calcined at 300 °C) catalyst, with a maintained selectivity of desired product above 98% ...
DOI:
10.1016/j.jcat.2018.05.007

7. Ethene oxychlorination over CuCl2/γ-Al2O3 catalyst in micro- and millistructured reactors

Author:
Zuzana Vajglová; Narendra Kumar; Kari Eränen; Markus Peurla; Dmitry Yu. Murzin; Tapio Salmi
Source:
Journal of catalysis 2018 v.364 pp. 334-344
ISSN:
0021-9517
Subject:
Fourier transform infrared spectroscopy; X-radiation; carbon dioxide; catalysts; catalytic activity; chlorides; desorption; ethylene; nitrogen; potassium; pyridines; scanning electron microscopy; sodium; transmission electron microscopy
Abstract:
... Oxychlorination of ethene was performed over CuCl₂/γ-Al₂O₃ catalyst in a microreactor (460 µm in diameter) and for comparison in a millireactor (1 cm in diameter). A copper-modified catalyst was prepared by a conventional evaporation–impregnation method without any promotors (e.g., K, Na, La) using copper (II) chloride as a precursor. The catalyst was characterized by nitrogen physisorption, Fouri ...
DOI:
10.1016/j.jcat.2018.05.019

8. Evolution of palladium sulfide phases during thermal treatments and consequences for acetylene hydrogenation

Author:
Yanan Liu; Alan J. McCue; Junting Feng; Shaoliang Guan; Dianqing Li; James A. Anderson
Source:
Journal of catalysis 2018 v.364 pp. 204-215
ISSN:
0021-9517
Subject:
acetylene; adsorption; carbon; crystal structure; desorption; ethylene; heat treatment; hydrogen; hydrogen sulfide; hydrogenation; palladium; sulfur; temperature
Abstract:
... Unsupported, bulk phase palladium sulfide has been studied for the selective hydrogenation of acetylene. The sample underwent significant change during thermal pretreatments, the extent of which depends on temperature. Exposure to hydrogen at temperatures of 150 °C or above results in the loss of sulfur from the sample, primarily as hydrogen sulfide. As sulfur is lost, the sample is progressively ...
DOI:
10.1016/j.jcat.2018.05.018

9. Heterogeneous photo-catalysis from the perspective of the adsorbed state. The photo-oxidation of propan-2-ol to propan-2-one on rutile titanium dioxide

Author:
Roger I. Bickley; Gerald R. Garside
Source:
Journal of catalysis 2018 v.364 pp. 89-101
ISSN:
0021-9517
Subject:
adsorption; crystallites; gases; photooxidation; sorption isotherms; titanium dioxide; ultraviolet radiation
Abstract:
... O₂-titrations accompanying ESR, adsorption isotherm and TPD studies of well-crystallised powdered rutile provide insights into the nature of the reduced surface following adsorption of propan-2-ol at 300 K. Estimates have been made of the mean dimensions of the octa-decahedral micro-crystallites, and of the manner in which UV-A radiation penetrates into a randomised particle-bed. The reduced surfa ...
DOI:
10.1016/j.jcat.2018.04.023

10. High performance V2O5/MgF2 catalysts for gas-phase dehydrofluorination of 1,1,1,3,3-pentafluoropropane: Support-induced evolution of new active sites

Author:
Jian-Dong Song; Tong-Yang Song; Ting-Ting Zhang; Yun Wang; Meng-Fei Luo; Ji-Qing Lu
Source:
Journal of catalysis 2018 v.364 pp. 271-281
ISSN:
0021-9517
Subject:
activation energy; catalysts; gases; reaction mechanisms; vanadium
Abstract:
... A series of supported V₂O₅/MgF₂ catalysts were prepared and tested for dehydrofluorination of 1,1,1,3,3-pentafluoropropane (HFC-245fa) to synthesize 1,3,3,3-tetrafluoropropene (HFO-1234ze). The addition of V₂O₅ in MgF₂ resulted in up to 5-fold increase in HFC-245fa conversion (from 19.2 to 95.2%) and much enhanced catalyst stability. Characterization results revealed that the dehydrofluorination i ...
DOI:
10.1016/j.jcat.2018.04.014

11. Highly selective electrocatalytic reduction of CO2 to formate over Tin(IV) sulfide monolayers

Author:
Jia He; Xijun Liu; Haoxuan Liu; Zhe Zhao; Yi Ding; Jun Luo
Source:
Journal of catalysis 2018 v.364 pp. 125-130
ISSN:
0021-9517
Subject:
carbon cycle; carbon dioxide; catalysts; durability; electrochemistry; formates; fuels; hydrogenation; renewable energy sources; sulfides; tin
Abstract:
... The electrochemical reduction of CO₂ to fuels or valuable chemicals is an attractive method for satisfying the requirements of renewable energy storage and the artificial carbon cycle. In this study, SnS₂ monolayers were applied as a robust catalyst for the electroreduction of CO₂, enabling the efficient production of HCCO⁻ with a high faradaic efficiency of 94 ± 5% and excellent long-term durabil ...
DOI:
10.1016/j.jcat.2018.05.005

12. Mechanistic investigations on asymmetric N-H insertion of amines catalyzed by palladium-chiral guanidine complex

Author:
Jing Li; Zhishan Su; Junming Wang; Changwei Hu
Source:
Journal of catalysis 2018 v.364 pp. 426-436
ISSN:
0021-9517
Subject:
Lewis acids; Lewis bases; activation energy; amines; aromatic compounds; catalysts; catalytic activity; energy; guanidines; hydrogen bonding; ligands; methylene chloride; moieties; nitrogen; palladium; stereoselectivity
Abstract:
... The mechanism and stereoselectivity of the asymmetric N-H insertion reactions between α-diazocarbonyl compounds and amines mediated by palladium-chiral guanidine complexes were investigated at the BP86-D3(BJ)/def2TZVP (SMD, CH₂Cl₂)//BP86-D3(BJ)/def2SVP (SMD, CH₂Cl₂) level at 303 K. The non-catalytic reaction occurred through a stepwise mechanism, with a high activation barrier of 56.4 kcal mol⁻¹. ...
DOI:
10.1016/j.jcat.2018.06.005

13. Methanol oxidation on the Au(3 1 0) surface: A theoretical study

Author:
Gabriele Tomaschun; Wilke Dononelli; Yong Li; Marcus Bäumer; Thorsten Klüner; Lyudmila V. Moskaleva
Source:
Journal of catalysis 2018 v.364 pp. 216-227
ISSN:
0021-9517
Subject:
active oxygen species; adsorption; dissociation; formaldehyde; gold; methanol; molecular models; oxidation; oxygen; theoretical models
Abstract:
... This work establishes a comprehensive analysis of the role of steps and kinks of the Au(3 1 0) surface in the generation of active oxygen species and elucidates the reaction pathway for methanol oxidation to formaldehyde. We have considered two possibilities for the OO bond splitting in molecular O₂: via a dissociative O₂ adsorption or a direct reaction of O₂ with methanol. Both reaction pathways ...
DOI:
10.1016/j.jcat.2018.05.020

14. Monometallic nanoparticles decorated and rare earth ions doped KTaO3/K2Ta2O6 photocatalysts with enhanced pollutant decomposition and improved H2 generation

Author:
Anna Krukowska; Grzegorz Trykowski; Wojciech Lisowski; Tomasz Klimczuk; Michal Jerzy Winiarski; Adriana Zaleska-Medynska
Source:
Journal of catalysis 2018 v.364 pp. 371-381
ISSN:
0021-9517
Subject:
X-ray photoelectron spectroscopy; adsorption; computer software; crystal structure; energy; energy-dispersive X-ray analysis; free radicals; gold; hydrogen; ions; irradiation; nanoparticles; oxidation; oxygen; phenol; photocatalysis; photocatalysts; photoluminescence; photons; physicochemical properties; platinum; pollutants; pollution control; reflectance spectroscopy; rhodium; superoxide anion; surface plasmon resonance; toluene; transmission electron microscopy
Abstract:
... New, monometallic nanoparticles (MNPs) decorated surface and rare earth (RE) ions doped lattice of perovskite-type (KTaO₃)/pyrochlore-type (K₂Ta₂O₆) photocatalysts were successfully prepared by facile hydrothermal incorporation of RE ions into KTaO₃/K₂Ta₂O₆ lattices followed by photodeposition of MNPs. The impact of noble metal type (MNPs = Au, Pt, Rh) and rare earth dopant type (RE = Er, Pr) on t ...
DOI:
10.1016/j.jcat.2018.05.013

15. Operando Raman-online FTIR investigation of ceria, vanadia/ceria and gold/ceria catalysts for toluene elimination

Author:
Qingyue Wang; King Lun Yeung; Miguel A. Bañares
Source:
Journal of catalysis 2018 v.364 pp. 80-88
ISSN:
0021-9517
Subject:
Bronsted acids; Fourier transform infrared spectroscopy; active sites; adsorption; benzaldehyde; byproducts; carbon dioxide; catalysts; catalytic activity; ceric oxide; cerium; combustion; gold; ions; oxygen; reactive oxygen species; temperature; toluene; vanadium
Abstract:
... Toluene oxidation on three ceria catalysts, CeO₂, VOₓ/CeO₂ and Au/CeO₂, was investigated by an operando Raman-online FTIR reactor cell. The reactive surface oxygen sites were preferred sites for vanadium and gold deposition. The deposited vanadium existed as V⁵⁺, while most of the gold was in Au⁺ state and roughly a third of ceria was in the reduced Ce³⁺ state. The Au/CeO₂ and CeO₂ catalysts (T₅₀∗ ...
DOI:
10.1016/j.jcat.2018.05.001

16. Optimizing Pd and Au-Pd decorated Bi2WO6 ultrathin nanosheets for photocatalytic selective oxidation of aromatic alcohols

Author:
Renshan Wang; Benxia Li; Yi Xiao; Xueqin Tao; Xintai Su; Xiaoping Dong
Source:
Journal of catalysis 2018 v.364 pp. 154-165
ISSN:
0021-9517
Subject:
absorption; alcohols; benzaldehyde; free radicals; gold; nanoparticles; nanosheets; oxidation; palladium; photocatalysis; photocatalysts; semiconductors; superoxide anion
Abstract:
... Ultrathin semiconductor nanosheets decorated with metallic nanoparticles (NPs) are promising in photocatalysis due to the multi-component interactions. The materials with a series of monometallic Pd and bimetallic Au-Pd NPs anchored on Bi₂WO₆ ultrathin nanosheets were synthesized and developed as photocatalysts for selective oxidation of aromatic alcohols to aromatic aldehyde. By optimizing the me ...
DOI:
10.1016/j.jcat.2018.05.015

17. Origin of ligand-driven selectivity in alkyne semihydrogenation over silica-supported copper nanoparticles

Author:
Nicolas Kaeffer; Kim Larmier; Alexey Fedorov; Christophe Copéret
Source:
Journal of catalysis 2018 v.364 pp. 437-445
ISSN:
0021-9517
Subject:
adsorption; alkanes; alkynes; catalysts; copper; copper nanoparticles; hydrogenation; ligands; silica; sorption isotherms
Abstract:
... Copper nanoparticles supported on silica are an earth-abundant catalyst efficient for alkyne hydrogenation, yielding high selectivity towards (Z)-olefin when organic ligands are added. Here, we investigate the origin of this selectivity by studying kinetics of the hydrogenation of the prototypical 1-phenyl-1-propyne substrate. Hydrogenation occurs stepwise on the unmodified catalyst, with first th ...
DOI:
10.1016/j.jcat.2018.06.006

18. Pd-catalyzed carbonylative α-arylation of azlactones: A formal four-component coupling route to α,α-disubstituted amino acids

Author:
Danielle L.J. Pinheiro; Dennis U. Nielsen; Giovanni W. Amarante; Troels Skrydstrup
Source:
Journal of catalysis 2018 v.364 pp. 366-370
ISSN:
0021-9517
Subject:
alanine; alcoholysis; carbon; catalytic activity; chemoselectivity; deuterium; isotope labeling; leucine; methionine; organoiodine compounds; palladium; phenylalanine; stable isotopes
Abstract:
... We report on a Pd-catalyzed carbonylative α-arylation of azlactones derived from alanine, providing facile access to α,α-disubstituted amino acids after an alcoholysis step. A range of aryl iodides proved to be suitable substrates in this formal four-component approach, providing the desired products in good to high yields. Other amino acids, such as methionine, leucine and phenylalanine could be ...
DOI:
10.1016/j.jcat.2018.04.027

19. PdRu alloy nanoparticles of solid solution in atomic scale: Size effects on electronic structure and catalytic activity towards electrooxidation of formic acid and methanol

Author:
Xiongwu Kang; Kanghua Miao; Zhiwei Guo; Jiasui Zou; Zhenqing Shi; Zhang Lin; Jie Huang; Shaowei Chen
Source:
Journal of catalysis 2018 v.364 pp. 183-191
ISSN:
0021-9517
Subject:
X-ray diffraction; alloy nanoparticles; alloys; catalytic activity; formic acid; methanol; oxidation; palladium; polyols; ruthenium
Abstract:
... It has been challenging to synthesize palladium (Pd) and ruthenium (Ru) alloy nanoparticles of solid solution in atomic scale, thus preventing us to study the size effect on the catalytic activity. Here we reported the synthesis of PdRu alloy nanoparticles through polyol reduction method, with the size from 6.0 to 16.6 nm. Elemental mapping indicated that Pd and Ru with 1:1 ratio are evenly distri ...
DOI:
10.1016/j.jcat.2018.05.022

20. Role of zirconium in direct CO2 hydrogenation to lower olefins on oxide/zeolite bifunctional catalysts

Author:
Shanshan Dang; Peng Gao; Ziyu Liu; Xinqing Chen; Chengguang Yang; Hui Wang; Liangshu Zhong; Shenggang Li; Yuhan Sun
Source:
Journal of catalysis 2018 v.364 pp. 382-393
ISSN:
0021-9517
Subject:
Fischer-Tropsch reaction; carbon dioxide; catalysts; catalytic activity; density functional theory; ethylene; hydrogenation; methane; nanoparticles; oxygen; physicochemical properties; propylene; temperature; zeolites; zirconium
Abstract:
... Direct production of lower olefins (C₂⁼−C₄⁼: ethylene, propylene and butylene), basic carbon-based building blocks, from carbon dioxide (CO₂) hydrogenation is highly attractive, although the selectivity towards olefins has been too low. Here we present a series of bifunctional catalysts contained indium-zirconium composite oxides with different In:Zr atomic ratios and SAPO-34 zeolite, which can ac ...
DOI:
10.1016/j.jcat.2018.06.010