Physicochemical and Catalytic Properties of La1-xCaxFeO3-0.5x Perovskites Prepared Using Mechanochemical Activation Full article
Journal |
Kinetics and Catalysis
ISSN: 0023-1584 , E-ISSN: 1608-3210 |
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Output data | Year: 2002, Volume: 43, Number: 1, Pages: 129-138 Pages count : 10 DOI: 10.1023/A:1014269700953 | ||
Tags | Solid Solution; Catalytic Activity; Calcination; Perovskite; Lanthanum | ||
Authors |
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Affiliations |
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Funding (1)
1 | Russian Foundation for Basic Research | 99-03-32836 |
Abstract:
The phase composition of La1 – xCaxFeO3 – 0.5x perovskites synthesized from preactivated oxides was studied by powder X-ray diffraction analysis and differential dissolution. The system does not form a continuous series of homogeneous solid solutions. No intermediate samples from this series are monophasic. It was found that the synthesis under nonequilibrium conditions (mechanical activation + calcination at 900°С for 4 h) resulted in nonequilibrium microheterogeneous solid solutions with degrees of calcium substitution for lanthanum of no higher than 0.5. A longer calcination (for 16 h) or an increase in the calcination temperature of solutions up to 1100 °С decreased the calcium content of the samples down to x ∼ 0.2 because of the formation of a brownmillerite phase. The catalytic activity of the test samples in the oxidation of CO changed nonmonotonically with x, and it was maximum at x = 0.5–0.6, which correlates with the maximum density of interphase boundaries in these samples.
Cite:
Isupova L.A.
, Tsybulya S.V.
, Kryukova G.N.
, Alikina G.M.
, Boldyreva N.N.
, Vlasov A.A.
, Snegurenko O.I.
, Ivanov V.P.
, Kolomiichuk V.N.
, Sadykov V.A.
Physicochemical and Catalytic Properties of La1-xCaxFeO3-0.5x Perovskites Prepared Using Mechanochemical Activation
Kinetics and Catalysis. 2002. V.43. N1. P.129-138. DOI: 10.1023/A:1014269700953 WOS Scopus РИНЦ
Physicochemical and Catalytic Properties of La1-xCaxFeO3-0.5x Perovskites Prepared Using Mechanochemical Activation
Kinetics and Catalysis. 2002. V.43. N1. P.129-138. DOI: 10.1023/A:1014269700953 WOS Scopus РИНЦ
Original:
Исупова Л.А.
, Цыбуля С.В.
, Крюкова Г.Н.
, Аликина Г.М.
, Болдырева Н.Н.
, Власов А.А.
, Снегуренко О.И.
, Иванов В.П.
, Коломийчук В.Н.
, Садыков В.А.
Физико-химические и каталитические свойства перовскитов ряда La1-xCaxFeO3-0.5x, полученных с использованием механохимической активации
Кинетика и катализ. 2002. Т.43. №1. С.140-149. РИНЦ
Физико-химические и каталитические свойства перовскитов ряда La1-xCaxFeO3-0.5x, полученных с использованием механохимической активации
Кинетика и катализ. 2002. Т.43. №1. С.140-149. РИНЦ
Dates:
Submitted: | Mar 29, 2000 |
Published print: | Jan 1, 2002 |
Identifiers:
Web of science | WOS:000174318000020 |
Scopus | 2-s2.0-0038237077 |
Elibrary | 13391338 |
Chemical Abstracts | 2002:218851 |
Chemical Abstracts (print) | 137:11455 |
OpenAlex | W345278135 |