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 |
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| 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 |
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| Affiliations |
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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
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
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 |