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1. 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
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

2. 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
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

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

Author:
Harris, James W.; Bhan, Aditya
Source:
Journal of catalysis 2019
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

4. The oxidation of chlorinated organic compounds over W-modified Pt/CeO2 catalysts

Author:
Gu, Yufeng; Shao, Shijie; Sun, Wei; Xia, Hangqi; Gao, Xiaohui; Dai, Qiguang; Zhan, Wangcheng; Wang, Xingyi
Source:
Journal of catalysis 2019
ISSN:
0021-9517
Subject:
DCB (herbicide); Fourier transform infrared spectroscopy; acetaldehyde; acidity; aqueous solutions; carbon dioxide; catalysts; catalytic activity; ceric oxide; chlorination; chlorobenzene; moieties; oxidation; oxygen; platinum
Abstract:
... Pt-xW/CeO2 catalysts, prepared by co-impregnation with aqueous solutions of (NH4)6-H2W12O40 and H2PtCI6, were applied in the catalytic oxidation of benzene (B), chlorobenzene (CB), and 1,2-dichlorobenzene (1,2-DCB). Characterization by various methods identified CeO2 as cubic fluorite, and WOx in the form of monoxo monotungstate. The interaction of WOx with CeO2 and Pt species led to the formation ...
DOI:
10.1016/j.jcat.2019.06.041