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Kinetic and Mechanistic Study of CO Oxidation over Nanocomposite Cu−Fe−Al Oxide Catalysts Full article

Journal ChemCatChem
ISSN: 1867-3880 , E-ISSN: 1867-3899
Output data Year: 2020, Volume: 12, Number: 19, Pages: 4911-4921 Pages count : 12 DOI: 10.1002/cctc.202000852
Tags CO oxidation; CuO; in situ study; kinetic study; nanocomposite; NAP XPS; reaction mechanism
Authors Fedorov Aleksandr 1 , Saraev Andrey 1 , Kremneva Anna 1 , Selivanova Aleksandra 1 , Vorokhta Mykhailo 2 , Šmíd Bretislav 2 , Bulavchenko Olga 1 , Yakovlev Vadim 1 , Kaichev Vasily 1
Affiliations
1 Boreskov Institute of Catalysis (BIC), Lavrentiev Ave., 5, 630090 Novosibirsk
2 Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University V Holešovičkách 2, 180 00 Prague 00 Prague (Czech Republic)

Funding (1)

1 Russian Science Foundation 17-73-20157

Abstract: The oxidation of CO has been studied over Fe−Al and Cu−Fe−Al oxide nanocomposite catalysts prepared by melting of copper, iron, and aluminum nitrates. It was shown that the addition of copper significantly increases the catalytic activity of the Fe−Al nanocomposites. The catalysts were characterized by low-temperature nitrogen adsorption, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). It was found that the catalysts contain Fe2O3 with the hematite structure modified by aluminum. Copper in the three-component catalyst is in the Cu2+ state, forming CuO and CuFeOx clusters on the catalyst surface. An increase in the copper content leads to the formation of a CuxAlyFe3-x-yO4 spinel phase. In situ XPS study showed that a treatment of the catalysts in a CO flow leads to the reduction of both copper and iron cations into the metallic state. In contrast, a treatment in a CO/O2 flow leads only to partial reduction of Cu2+ to Cu1+, while Fe3+ are not reduced. The tests of catalytic activity performed in a flow fixed bed reactor using a CO pulse technique showed that the light-off temperature in the oxidation of CO over the Cu−Fe−Al nanocomposite catalysts depends on the copper content. The minimal light-off temperature was achieved over the catalyst containing 5 wt% CuO. In addition, we performed kinetic measurements in a differential reactor and obtained the activation energy and the reaction orders with respect to the reactants. The reaction mechanism of the catalytic oxidation of CO and the origin of active species are discussed. © 2020 Wiley-VCH GmbH
Cite: Fedorov A. , Saraev A. , Kremneva A. , Selivanova A. , Vorokhta M. , Šmíd B. , Bulavchenko O. , Yakovlev V. , Kaichev V.
Kinetic and Mechanistic Study of CO Oxidation over Nanocomposite Cu−Fe−Al Oxide Catalysts
ChemCatChem. 2020. V.12. N19. P.4911-4921. DOI: 10.1002/cctc.202000852 WOS Scopus РИНЦ AN OpenAlex
Dates:
Submitted: May 20, 2020
Accepted: Jul 7, 2020
Published online: Jul 7, 2020
Published print: Oct 6, 2020
Identifiers:
Web of science: WOS:000567671800001
Scopus: 2-s2.0-85090060989
Elibrary: 45323933
Chemical Abstracts: 2020:1747079
OpenAlex: W3040397145
Citing:
DB Citing
Scopus 17
Web of science 15
Elibrary 17
OpenAlex 20
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