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Microstructural Changes in La0.5Ca0.5Mn0.5Fe0.5O3 Solid Solutions under the Influence of Catalytic Reaction of Methane Combustion

1
Boreskov Institute of Catalysis SB RAS, 630090 Novosibirsk, Russia
2
Novosibirsk National Research University, 630090 Novosibirsk, Russia
*
Author to whom correspondence should be addressed.
Catalysts 2019, 9(6), 563; https://doi.org/10.3390/catal9060563
Received: 29 April 2019 / Revised: 16 June 2019 / Accepted: 20 June 2019 / Published: 24 June 2019
(This article belongs to the Special Issue Catalytic Concepts for Methane Combustion)
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Abstract

This article attempts to study changes in the microstructure of solid solutions with the perovskite structure La0.5Ca0.5Mn0.5Fe0.5O3 under the action of the methane oxidation reaction medium. By the methods of XRD, XPS and HRTEM the initial condition of the structure and the surface of the perovskite were both investigated. A feature of the structure of this solid solution is the presence of planar defects in the direction of the planes (101). After the methane oxidation reaction, a similar study of perovskite structure was conducted to obtain the changes. It was shown that under the action of the reaction medium, Ca1−xMnxO particles form on the surface of the perovskite phase, while planar defects in La0.5Ca0.5Mn0.5Fe0.5O3 structure remain. In situ XRD experiments on perovskite calcination in helium current up to 750 °C showed the formation of a similar Ca1−xMnxO phase on the perovskite surface. View Full-Text
Keywords: perovskite; catalytic oxidation of methane; planar defects; solid solutions; in situ XRD perovskite; catalytic oxidation of methane; planar defects; solid solutions; in situ XRD
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Gerasimov, E.Y.; Rogov, V.A.; Prosvirin, I.P.; Isupova, L.A.; Tsybulya, S.V. Microstructural Changes in La0.5Ca0.5Mn0.5Fe0.5O3 Solid Solutions under the Influence of Catalytic Reaction of Methane Combustion. Catalysts 2019, 9, 563.

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