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In Situ X-Ray Absorption Spectroscopy Studies of Carbon Monoxide Oxidation in the Presence of Nanocomposite Cu–Fe–Al Oxide Catalysts Full article

Journal Kinetics and Catalysis
ISSN: 0023-1584 , E-ISSN: 1608-3210
Output data Year: 2021, Volume: 62, Number: 1, Pages: 160–171 Pages count : 12 DOI: 10.1134/S0023158421010079
Tags CO oxidation, nanocomposites, CuO, in situ studies, reaction mechanism
Authors Kremneva A.M. 1 , Fedorov A.V. 1 , Saraev A.A. 1 , Bulavchenko O.A. 1 , Yakovlev V.A. 1 , Kaichev V.V. 1
Affiliations
1 Federal Research Center Boreskov Institute of Catalysis, Novosibirsk, 630090 Russia

Funding (1)

1 Russian Science Foundation 17-73-20157

Abstract: Nanocomposite Fe–Al and Cu–Fe–Al oxide catalysts are studied in the CO oxidation reaction. It is shown that the introduction of copper leads to a more than two orders of magnitude increase in the reaction rate. The most active catalyst is a nanocomposite containing 5 wt % CuO, 78 wt % Fe2O3, and 17 wt % Al2O3. According to X-ray diffraction analysis, the catalysts consist of hematite nanoparticles, α-Fe2O3, and amorphous alumina. Copper is in a highly dispersed state to form CuO and CuFeOx clusters. Results of in situ X‑ray absorption spectroscopy studies suggest that the reduction of copper from Cu2+ to Cu1+ and Cu0 in a CO stream begins at a temperature of 200–250°C; at 400–600°C, copper is mostly in the metallic state; the Fe3O4 → FeO → Fe reduction begins at 400–500°С. In a stoichiometric mixture of CO and O2, Fe3+ does not undergo reduction; the reduction of copper oxide to metal occurs at temperatures above 400°C. In the presence of excess oxygen in a temperature range of 100–600°C, no changes in the chemical state of the catalysts are detected. The mechanism of CO oxidation in the presence of Cu–Fe–Al nanocomposites is proposed.
Cite: Kremneva A.M. , Fedorov A.V. , Saraev A.A. , Bulavchenko O.A. , Yakovlev V.A. , Kaichev V.V.
In Situ X-Ray Absorption Spectroscopy Studies of Carbon Monoxide Oxidation in the Presence of Nanocomposite Cu–Fe–Al Oxide Catalysts
Kinetics and Catalysis. 2021. V.62. N1. P.160–171. DOI: 10.1134/S0023158421010079 WOS Scopus РИНЦ ANCAN OpenAlex
Original: Кремнева А.М. , Федоров А.В. , Сараев А.А. , Булавченко О.А. , Яковлев В.А. , Каичев В.В.
In situ исследование окисления CO на нанокомпозитных Cu–Fe–Al-оксидных катализаторах методами спектроскопии рентгеновского поглощения
Кинетика и катализ. 2021. Т.62. №1. С.94-108. DOI: 10.31857/s045388112101007x РИНЦ OpenAlex
Dates:
Submitted: May 12, 2020
Accepted: Jul 20, 2020
Published print: Jan 1, 2021
Published online: Mar 3, 2021
Identifiers:
Web of science: WOS:000625135300018
Scopus: 2-s2.0-85102141037
Elibrary: 46759559
Chemical Abstracts: 2021:567119
Chemical Abstracts (print): 174:917466
OpenAlex: W3134368072
Citing:
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Scopus 3
Web of science 2
Elibrary 3
OpenAlex 3
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