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Effect of the Cr/Fe Ratio on the Structure of Fe-Cr-Cu-Containing Oxide Catalysts Full article

Journal Kinetics and Catalysis
ISSN: 0023-1584 , E-ISSN: 1608-3210
Output data Year: 2015, Volume: 56, Number: 4, Pages: 493-500 Pages count : 8 DOI: 10.1134/S0023158415030167
Tags atomic radial distribution, copper ferrite-chromite, electronic state of cations, water gas shift reaction
Authors Plyasova L.M. 1 , Larina T.V. 1 , Kriventsov V.V. 1 , Zaikovskii V.I. 1 , Dokuchits E. 1 , Minyukova T.P. 1
Affiliations
1 Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia

Funding (2)

1 Russian Foundation for Basic Research 13-03-00469
2 Federal Agency for Scientific Organizations V.45.8.11

Abstract: The morphology and structural and electronic states of nanodispersed copper ferrite-chromites of with different Cr/Fe ratios calcined at 900°C in an atmosphere of air were studied using a set of physical methods. The morphology, the homogeneity of chemical composition, and the degree of perfection of spinels formed from mixed Fe-Cr-Cu hydroxo compounds upon heat treatment were studied by HRTEM. From an analysis of atomic radial distribution curves, it follows that copper ferrite-chromite with a partially inverted spinel structure was formed at the ratio Cr/Fe = 1. With the use of DRS, it was found that all of the Fe-Cr-Cu-containing oxide samples contained Cu2+ cations in tetrahedral and tetragonally distorted octahedral oxygen coordination. In this case, the DRS spectra exhibited a decrease in the absorption energy of Cu2+ cations as the Cr/Fe ratio was decreased from 2 to 1, which indicated a decrease in the tetragonal distortion of the octahedral oxygen environment of the Cu2+ cations. In general, the data on the distribution of cations in Fe-Cr-Cu oxides with different Cr/Fe ratios obtained by EXAFS and DRS are consistent with the results of crystallochemical analysis. It was confirmed that the distribution of Cu2+ cations significantly affected the activation energy of water gas shift reaction.
Cite: Plyasova L.M. , Larina T.V. , Kriventsov V.V. , Zaikovskii V.I. , Dokuchits E. , Minyukova T.P.
Effect of the Cr/Fe Ratio on the Structure of Fe-Cr-Cu-Containing Oxide Catalysts
Kinetics and Catalysis. 2015. V.56. N4. P.493-500. DOI: 10.1134/S0023158415030167 WOS Scopus РИНЦ AN OpenAlex
Original: Плясова Л.М. , Ларина Т.В. , Кривенцов В.В. , Зайковский В.И. , Докучиц Е.В. , Минюкова Т.П.
Влияние соотношения Cr/Fe на структурные особенности Fe–Cr–Cu-содержащих оксидных катализаторов
Кинетика и катализ. 2015. Т.56. №4. С.499-506. DOI: 10.7868/S0453881115030168 РИНЦ OpenAlex
Dates:
Submitted: Oct 29, 2014
Published print: Jul 1, 2015
Published online: Jul 25, 2015
Identifiers:
Web of science: WOS:000358408700013
Scopus: 2-s2.0-84937855672
Elibrary: 23992806
Chemical Abstracts: 2015:1234217
OpenAlex: W1173755418
Citing:
DB Citing
Web of science 4
Scopus 3
Elibrary 3
OpenAlex 4
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