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1. A possible role of paramagnetic states of iron carbides in the fischer–tropsch synthesis selectivity of nanosized slurry catalysts

Author:
Kuz'min, A.E.; Pichugina, D.A.; Kulikova, M.V.; Dement'eva, O.S.; Nikitina, N.A.; Maksimov, A.L.
Source:
Journal of catalysis 2019 v.380 pp. 32-42
ISSN:
0021-9517
Subject:
Fischer-Tropsch reaction; X-ray diffraction; carbides; carbon monoxide; catalysts; catalytic activity; iron; nanomaterials; regression analysis; slurries; sorption; thermal degradation
Abstract:
... Features of various Fe-containing nanosized slurry Fischer–Tropsch catalysts, obtained in situ by thermolysis, were investigated experimentally (catalytic tests, XRD, hermomagnetometric methods) and theoretically (DFT ab initio calculations, regression analysis). XRD patterns of the samples reveal the presence of preferentially single Fe₇C₃, Fe₅C₂ and Fe₂C. A quantitative correlation was found bet ...
DOI:
10.1016/j.jcat.2019.09.033

2. AuCu/CeO2 bimetallic catalysts for the selective oxidation of fatty alcohol ethoxylates to alkyl ether carboxylic acids

Author:
Gu, Q.; Fang, W.-H.; Wischert, R.; Zhou, W-J.; Michel, C.; Pera-Titus, M.
Source:
Journal of catalysis 2019 v.380 pp. 132-144
ISSN:
0021-9517
Subject:
X-ray diffraction; X-ray photoelectron spectroscopy; adsorption; alloys; carboxylic acids; catalysts; catalytic activity; ceric oxide; copper; copper nanoparticles; energy; engineering; fatty alcohols; gold; hydrogen peroxide; models; nanoceria; nanogold; oxidants; oxidation; polyethylene glycol; transmission electron microscopy
Abstract:
... We describe in this work the preparation of a series of bimetallic Au-Cu catalysts supported over nanoceria for the direct oxidation of C₁₂-C₁₄-alcohol polyethyleneglycol ether with on average 7 ethyl oxide units (AEO7) to polyoxyethylene lauryl ether carboxylic acid (AECA6), using H₂O₂ as an oxidant, under basic conditions. Different preparation methods have been used, including deposition-precip ...
DOI:
10.1016/j.jcat.2019.10.017

3. Boosting levulinic acid hydrogenation to value-added 1,4-pentanediol using microwave-assisted gold catalysis

Author:
Bucciol, F.; Tabasso, S.; Grillo, G.; Menegazzo, F.; Signoretto, M.; Manzoli, M.; Cravotto, G.
Source:
Journal of catalysis 2019 v.380 pp. 267-277
ISSN:
0021-9517
Subject:
catalysts; catalytic activity; gold; hydrogen; hydrogenation; levulinic acid; microwave treatment; nanogold; oxidation; titanium dioxide; value added; zirconium oxide
Abstract:
... Microwave (MW) -assisted levulinic acid (LA) hydrogenation has been performed over two gold catalysts (commercial 1 wt% Au/TiO₂ by AUROlite™ and 2.5 wt% Au/ZrO₂, prepared using deposition-precipitation). MW-assisted LA hydrogenation was carried out in water and in solvent-free conditions via (i) H-transfer and (ii) molecular H₂. Au/TiO₂ promoted complete LA conversion and the further reduction of ...
DOI:
10.1016/j.jcat.2019.09.041

4. Catalytic arene alkylation over H-Beta zeolite: Influence of zeolite shape selectivity and reactant nucleophilicity

Author:
Zeng, Xin; Wang, Zichun; Ding, Jia; Wang, Leizhi; Jiang, Yijiao; Stampfl, Catherine; Hunger, Michael; Huang, Jun
Source:
Journal of catalysis 2019 v.380 pp. 9-20
ISSN:
0021-9517
Subject:
Bronsted acids; Lewis bases; X-ray diffraction; acidity; alkylation; benzene; benzyl alcohol; benzylation; biorefining; catalysts; catalytic activity; feedstocks; lignocellulose; micropores; moieties; molecular weight; nuclear magnetic resonance spectroscopy; porosity; porous media; toluene; transmission electron microscopy; xylene; zeolites
Abstract:
... Renewable arenes and aromatic alcohols can be derived from lignocellulose by biorefineries, which has been considered as a sustainable alternative to replace petrochemical feedstocks in the synthesis of monobenzylation products, key industrial intermediates, via benzylation reactions. Zeolites with micropores are the most widely used catalysts in the benzylation of arenes, however, their performan ...
DOI:
10.1016/j.jcat.2019.09.035

5. Cercosporin-bioinspired photoreductive activation of aryl halides under mild conditions

Author:
Tang, Zhaocheng; Li, Jia; Lin, Fulin; Bao, Wenhao; Zhang, Shiwei; Guo, Baodang; Huang, Shuping; Zhang, Yan; Rao, Yijian
Source:
Journal of catalysis 2019 v.380 pp. 1-8
ISSN:
0021-9517
Subject:
Cercospora; anions; fermentation; organic halogen compounds; photocatalysis; photocatalysts; pigments; plant pathogenic fungi; spectroscopy
Abstract:
... Bioinspired by the naturally-occurring cercosporin-driven infection process of plant pathogenic fungi Cercospora sp., here we took advantage of the photophysical properties of cercosporin, and used it as a metal-free photocatalyst to develop an unprecedented cercosporin-driven photocatalysis under mild conditions. Furthermore, the forming conditions and excited-state dynamics of radical anions of ...
DOI:
10.1016/j.jcat.2019.09.036

6. Characterization of deactivated and regenerated zeolite ZSM-5-based catalyst extrudates used in catalytic pyrolysis of biomass

Author:
Heracleous, E.; Pachatouridou, E.; Hernández-Giménez, A.M.; Hernando, H.; Fakin, T.; Paioni, A.L.; Baldus, M.; Serrano, D.P.; Bruijnincx, P.C.A.; Weckhuysen, B.M.; Lappas, A.A.
Source:
Journal of catalysis 2019 v.380 pp. 108-122
ISSN:
0021-9517
Subject:
Bronsted acids; air; biomass; catalysts; catalytic activity; catalytic cracking; egg shell; fluorescence microscopy; oxidation; pyrolysis; temperature; zeolites; zirconium oxide
Abstract:
... A major issue in the catalytic fast pyrolysis (CFP) of biomass is the rapid deactivation of the typically employed zeolite-based catalysts. Detailed understanding of the deactivation pathways and the type and location of coke deposits are essential for the further development of improved or new catalyst materials, including appropriate regeneration protocols. Such deactivation and regeneration stu ...
DOI:
10.1016/j.jcat.2019.10.019

7. Clay nanotubes catalyzed solvent-free synthesis of octahydro-2H-chromenols with pharmaceutical potential from (-)-isopulegol and ketones

Author:
Sidorenko, A.Yu.; Kravtsova, A.V.; Il'ina, I.V.; Wärnå, J.; Korchagina, D.V.; Gatilov, Yu.V.; Volcho, K.P.; Salakhutdinov, N.F.; Murzin, D.Yu.; Agabekov, V.E.
Source:
Journal of catalysis 2019 v.380 pp. 145-152
ISSN:
0021-9517
Subject:
acetone; acidity; alcohols; aldehydes; antiviral properties; byproducts; carbonyl compounds; catalysts; catalytic activity; halloysite; heterocyclic compounds; hydrochloric acid; hydrolysis; models; nanotubes; stereoselectivity; temperature; terpenoids
Abstract:
... Natural halloysite nanotubes (HNT) pretreated with hydrochloric acid were applied for the first time for selective synthesis of octahydro-2H-chromenols (as 4R- and 4S-diastereomers) using terpenoid (-)-isopulegol and ketones as reactants. The main attention was paid to the reaction with acetone, because the resulting 4R-isomer displays antiviral activity. While the drawback of the isopulegol Prins ...
DOI:
10.1016/j.jcat.2019.10.015

8. Comprehensive understanding the promoting effect of Dy-doping on MnFeOx nanowires for the low-temperature NH3-SCR of NOx: An experimental and theoretical study

Author:
Gao, Chen; Xiao, Bing; Shi, Jian-Wen; He, Chi; Wang, Baorui; Ma, Dandan; Cheng, Yonghong; Niu, Chunming
Source:
Journal of catalysis 2019 v.380 pp. 55-67
ISSN:
0021-9517
Subject:
adsorption; ammonia; catalysts; catalytic activity; chemical reduction; dysprosium; iron; manganese; nanowires; nitric oxide; oxygen
Abstract:
... Recently, Mn-based catalysts doped/modified by rare earth elements for the selective catalytic reduction (SCR) of NOₓ with NH₃ are becoming a new research hotspot. In current work, Dy-doped MnFe oxides with the morphology of one-dimensional nanowire are successfully prepared by using electrospinning method for the first time, and the catalytic performances for the NH₃-SCR of NOₓ are investigated i ...
DOI:
10.1016/j.jcat.2019.10.003

9. CoxFe1-xAl2O4+δ composite oxides supported Pt nanoparticles as efficient and recyclable catalysts for the liquid-phase selective hydrogenation of cinnamaldehyde

Author:
Xin, Huiyue; Xue, Yujie; Zhang, Wenbo; Wu, Peng; Li, Xiaohong
Source:
Journal of catalysis 2019 v.380 pp. 254-266
ISSN:
0021-9517
Subject:
X-ray photoelectron spectroscopy; active sites; alcohols; catalysts; catalytic activity; glucose; hydrogenation; kinetics; models; moieties; nanoparticles; oxides; platinum; sol-gel processing; temperature
Abstract:
... CoₓFe₁₋ₓAl₂O₄₊δ composite oxides were prepared using a sol-gel method with glucose as hard template. Pt nanoparticles supported on CoₓFe₁₋ₓAl₂O₄₊δ were employed for the liquid-phase selective hydrogenation of cinnamaldehyde (CAL) to yield the desired cinnamyl alcohol (COL). The activity increased with the x value; while the selectivity to COL almost kept above 90% despite of different x values. Up ...
DOI:
10.1016/j.jcat.2019.09.042

10. DBU-functionalized MCM-41-coated nanosized hematite (DBU-F-MCM-41-CNSH): A new magnetically separable basic nanocatalyst for the synthesis of some nucleoside-containing heterocycles

Author:
Kordnezhadian, Reza; Shekouhy, Mohsen; Karimian, Somaye; Khalafi-Nezhad, Ali
Source:
Journal of catalysis 2019 v.380 pp. 91-107
ISSN:
0021-9517
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; catalysts; catalytic activity; hematite; liquids; magnetism; nanomaterials; porous media; pyrimidines; quinolines; scanning electron microscopy; toxicity; transmission electron microscopy
Abstract:
... DBU-functionalized MCM-41-coated nanosized hematite (DBU-F-MCM-41-CNSH) was successfully prepared as a new magnetically separable and reusable mesoporous basic nanocatalyst and characterized by various techniques such as FT-IR, XRD, HR-TEM, FESEM, BET, VSM and elemental analyses (CHN and ICP-OES). The prepared nanocatalyst was then successfully applied for the synthesis of some nucleoside-containi ...
DOI:
10.1016/j.jcat.2019.10.020

11. Effects of β-bromine substitution and core protonation on photosensitizing properties of porphyrins: Long wavelength photosensitizers

Author:
Zakavi, Saeed; Naderloo, Mortaza; Heydari-turkmani, Akram; Alghooneh, Leila; Eskandari, Mortaza
Source:
Journal of catalysis 2019 v.380 pp. 236-246
ISSN:
0021-9517
Subject:
absorption; acids; bromination; fluorescence; moieties; oxidation; oxidative stability; photocatalysis; photosensitizing agents; porphyrins; protonation; singlet oxygen; therapeutics; wavelengths
Abstract:
... In this study, a series of β-brominated meso-tetraphenylporphyrins, H₂TPPBrₓ (x = 2, 4, 6 and 8) with remarkably red shifted absorption bands towards the longer wavelengths of the visible light known as therapeutic window and their diprotonated analogues were used as photosensitizers in the aerobic oxidation of cyclooctene to investigate the influence of degree of β bromination on the photocatalyt ...
DOI:
10.1016/j.jcat.2019.10.005

12. Enhanced hydrogenation of dimethyl oxalate to ethylene glycol over indium promoted Cu/SiO2

Author:
Yu, Xinbin; Vest, Trey A.; Gleason-Boure, Nicolas; Karakalos, Stavros G.; Tate, Gregory L.; Burkholder, Michael; Monnier, John R.; Williams, Christopher T.
Source:
Journal of catalysis 2019 v.380 pp. 289-296
ISSN:
0021-9517
Subject:
catalysts; copper; ethylene glycol; gelation; hydrogen; hydrogenation; indium; oxalates; silica; synthesis gas
Abstract:
... Hydrogenation of dimethyl oxalate (DMO) on Cu/SiO₂ catalysts is the final reaction step in a growing industrial syngas to ethylene glycol (StEG) process. In the present work, indium species are found to dramatically enhance the performance of a Cu/SiO₂ catalyst prepared by urea-assisted gelation for the conversion of DMO to EG. Characterization reveals that indium species have negligible effect on ...
DOI:
10.1016/j.jcat.2019.10.001

13. Evolution and enhancement of the oxygen cycle in the catalytic performance of total toluene oxidation over manganese-based catalysts

Author:
Qin, Yuan; Wang, Hui; Dong, Cui; Qu, Zhenping
Source:
Journal of catalysis 2019 v.380 pp. 21-31
ISSN:
0021-9517
Subject:
active oxygen species; catalysts; catalytic activity; manganese oxides; oxidation; oxygen; reaction mechanisms; silver; stable isotopes; temperature; toluene
Abstract:
... An investigation of the effect of oxygen and silver species on the oxidation of toluene has been launched to identify the reaction process and mechanism over MnOₓ/SBA-15 and Ag–MnOₓ/SBA-15 catalysts. Detailed knowledge of the effect and cycle of oxygen species under reaction is typically missing, and this study points at the behavior of oxygen species over MnOₓ/SBA-15 for toluene oxidation for the ...
DOI:
10.1016/j.jcat.2019.09.027

14. Evolution of steady-state material properties during catalysis: Oxidative coupling of methanol over nanoporous Ag0.03Au0.97

Author:
Zugic, Branko; van Spronsen, Matthijs A.; Heine, Christian; Montemore, Matthew M.; Li, Yuanyuan; Zakharov, Dmitri N.; Karakalos, Stavros; Lechner, Barbara A.J.; Crumlin, Ethan; Biener, Monika M.; Frenkel, Anatoly I.; Biener, Juergen; Stach, Eric A.; Salmeron, Miquel B.; Kaxiras, Efthimios; Madix, Robert J.; Friend, Cynthia M.
Source:
Journal of catalysis 2019 v.380 pp. 366-374
ISSN:
0021-9517
Subject:
alloys; carbon dioxide; catalysts; catalytic activity; formates; gold; methanol; nanogold; nanopores; nanosilver; oxidation; oxygen; ozone; silver; temperature
Abstract:
... Activating pretreatments are used to tune surface composition and structure of bimetallic-alloy catalysts. Herein, the activation-induced changes in material properties of a nanoporous Ag₀.₀₃Au₀.₉₇ alloy and their subsequent evolution under steady-state CH₃OH oxidation conditions are investigated. Activation using O₃ results in AgO and Au₂O₃, strongly enriching the near-surface region in Ag. These ...
DOI:
10.1016/j.jcat.2019.08.041

15. Formation of defect site on ZIF-7 and its effect on the methoxycarbonylation of aniline with dimethyl carbonate

Author:
Dahnum, Deliana; Seo, Bora; Cheong, Seok-Hyeon; Lee, Ung; Ha, Jeong-Myeong; Lee, Hyunjoo
Source:
Journal of catalysis 2019 v.380 pp. 297-306
ISSN:
0021-9517
Subject:
Lewis acids; X-ray photoelectron spectroscopy; adsorption; aniline; benzimidazole; carbon dioxide; carbonates; catalysts; crystal structure; hydrogen; imidazole; leaching; methylation; moieties; nuclear magnetic resonance spectroscopy; scanning electron microscopy; temperature; transmission electron microscopy; zinc
Abstract:
... The Zeolitic Imidazole Framework ZIF-7, (Zn(benzimidazole)₂), is known to exhibit a unique gate-opening property depending on the temperature and pressure in the presence of guest molecules, making it useful for H₂, CO₂, and paraffine separation technology. Besides this distinctive gas adsorption property, ZIF-7 can be used as a catalyst because it contains a Lewis acid site on Zn, and a Lewis bas ...
DOI:
10.1016/j.jcat.2019.09.039

16. Fullerene-like WS2 supported Pd catalyst for hydrogen evolution reaction

Author:
Xiao, Ping; Buijnsters, Josephus G.; Zhao, Yanxi; Yu, Huan; Xu, Xuelian; Zhu, Yujun; Tang, Duihai; Zhu, Junjiang; Zhao, Zhen
Source:
Journal of catalysis 2019 v.380 pp. 215-223
ISSN:
0021-9517
Subject:
active sites; catalysts; catalytic activity; electrochemistry; hydrogen; hydrogen production; nanoparticles; palladium; platinum; reaction mechanisms; renewable energy sources; sulfuric acid; tungsten oxide
Abstract:
... Hydrogen is the most desirable green energy carrier and electrocatalytic hydrogen evolution reaction (HER) from water is a promising route for hydrogen production. The search for efficient, low-cost HER catalysts is a challenging and attracting topic. In this work, we report that inorganic fullerene-like WS₂ supported Pd nanoparticles (Pd/WS₂), with Pd loading of 0.76 wt%, are active for electroca ...
DOI:
10.1016/j.jcat.2019.10.007

17. Influence of pretreatment on the catalytic performance of Ag/CeO2 for formaldehyde removal at low temperature

Author:
Ou, Chun-Chang; Chen, Chia-Han; Chan, Ting-Shan; Chen, Ching-Shiun; Cheng, Soofin
Source:
Journal of catalysis 2019 v.380 pp. 43-54
ISSN:
0021-9517
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; X-ray photoelectron spectroscopy; atomic absorption spectrometry; catalysts; catalytic activity; ceric oxide; energy-dispersive X-ray analysis; formaldehyde; hydrogen; moieties; nanoparticles; nanosilver; oxidation; oxygen; particle size; protons; reflectance; silver; temperature; transmission electron microscopy
Abstract:
... Silver supported on CeO₂ nanoparticles (Ag/CeO₂) was found to be an efficient catalyst for formaldehyde removal at low temperature. The activity of Ag/CeO₂ catalysts in HCHO oxidation was markedly influenced by pretreatment at different calcination temperatures and H₂ reduction. A 6 wt%Ag/CeO₂ catalyst calcined at 573 K and then reduced at 473 K with 10% H₂/N₂ showed 100% conversion of 400 ppm for ...
DOI:
10.1016/j.jcat.2019.09.028

18. Investigation of selective chemisorption of fcc and hcp Ru nanoparticles using X-ray photoelectron spectroscopy analysis

Author:
Gueye, Ibrahima; Kim, Jaemyung; Kumara, L.S.R.; Yang, Anli; Seo, Okkyun; Chen, Yanna; Song, Chulho; Hiroi, Satoshi; Kusada, Kohei; Kobayashi, Hirokazu; Kitagawa, Hiroshi; Sakata, Osami
Source:
Journal of catalysis 2019 v.380 pp. 247-253
ISSN:
0021-9517
Subject:
X-ray photoelectron spectroscopy; adsorption; alloy nanoparticles; carbon dioxide; carbon monoxide; catalytic activity; oxygen; polyvinylpyrrolidone; ruthenium
Abstract:
... We investigated the crucial relation between the intrinsic electronic structure and surface chemisorption behavior of prototypical Ruthenium nanoparticles (Ru NPs) by tuning the size (from 2.2 to 5.4 nm) and structure (face centered cubic (fcc) and hexagonal close packed (hcp)). Ru NPs covered with a polyvinylpyrrolidone (PVP) was analysed through the synchrotron-based hard X-ray photoelectron spe ...
DOI:
10.1016/j.jcat.2019.10.004

19. Kinetics of chlorine deposition and removal over promoted silver catalysts during ethylene epoxidation

Author:
Harris, James W.; Bhan, Aditya
Source:
Journal of catalysis 2019 v.380 pp. 318-331
ISSN:
0021-9517
Subject:
aluminum oxide; carbon dioxide; catalysts; catalytic activity; chemical bonding; chlorides; chlorine; dissociation; enthalpy; epoxidation reactions; ethylene; ethylene oxide; gases; isotopes; kinetics; organochlorine compounds; oxidation; oxygen; propane; silver
Abstract:
... High partial oxidation selectivity in ethylene oxidation over Ag catalysts is achieved in part via the presence of adsorbed chlorine promoters. Chlorine coverage during ethylene oxidation is maintained by co-feeding organic chlorides in ppm levels and alkane moderators in concentrations of ~0.5 mol%. The relative efficacy of organic chlorides in Cl deposition and of alkanes in Cl removal is typica ...
DOI:
10.1016/j.jcat.2019.09.037

20. Lewis acidic supports promote the selective hydrogenation of carbon dioxide to methyl formate in the presence of methanol over Ag catalysts

Author:
Corral-Pérez, Juan José; Copéret, Christophe; Urakawa, Atsushi
Source:
Journal of catalysis 2019 v.380 pp. 153-160
ISSN:
0021-9517
Subject:
acidity; aluminum oxide; carbon dioxide; catalysts; catalytic activity; formates; hydrogenation; methanol; nanosilver; silica; silver; temperature; zirconium oxide
Abstract:
... Silica-supported silver nanoparticles exhibit outstanding efficiency in the CO₂ hydrogenation to methyl formate in the presence of methanol under high pressure. Here, we show that ZrO₂ and Al₂O₃ supports significantly increase the catalyst activity, in line with their higher Lewis acidity. The weight time yield of methyl formate over Ag/ZrO₂ is up to 16.2 gMF gAg h⁻¹ without detectable side-produc ...
DOI:
10.1016/j.jcat.2019.10.013