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 |
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| 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 |
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| Affiliations |
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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
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
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 |