Catalytic oxidation of CO on LaMn1−xFexO3 perovskites solid solution

•LaMn1−xFexO3 perovskites were prepared by co-precipitation and rotor-vapor citrate method.•LaMn1−xFexO3 series prepared by rotor-vapor citrate method showed highest activity due to highest BET surface area.•The highest dispersion of Mn4+-O-Fe3+ species on the surface of LaMn0.4Fe0.6O3 show the lowe...

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Bibliographic Details
Published in:Journal of molecular catalysis. A, Chemical Chemical, 2014-09, Vol.391, p.7-11
Main Authors: Zheng, Saijing, Hua, Qing, Gu, Wenbo, Liu, Baizhan
Format: Article
Language:English
Subjects:
Apparent activation energy (Ea)
BET area
Catalysis
Chemistry
CO oxidation
Exact sciences and technology
General and physical chemistry
La-Mn-Fe perovskite-type oxides
Rotor-vapor citrate method
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:•LaMn1−xFexO3 perovskites were prepared by co-precipitation and rotor-vapor citrate method.•LaMn1−xFexO3 series prepared by rotor-vapor citrate method showed highest activity due to highest BET surface area.•The highest dispersion of Mn4+-O-Fe3+ species on the surface of LaMn0.4Fe0.6O3 show the lowest apparent activation energy (Ea) towards the oxidation of CO. Catalytic CO oxidation was studied over LaMn1−xFexO3 perovskites prepared by co-precipitation and rotor-vapor citrate method. The catalysts were characterized by X-ray diffraction (XRD), Transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS). XRD analysis showed that LaMn1−xFexO3 samples prepared by rotor-vapor citrate method were single-phase perovskite-type oxides, but not prepared by co-precipitation. XPS results indicated that Mn element was mainly in Mn4+ state and Fe element was mainly in Fe3+ state on the surface of the catalysts. LaMn1−xFexO3 prepared by rotor-vapor citrate method exhibited higher activity for CO oxidation than which prepared by co-precipitation, and among the LaMn1−xFexO3 series prepared by rotor-vapor citrate method LaMn0.4Fe0.6O3 showed highest activity due to highest BET surface area. The lowest apparent activation energy (Ea) towards the oxidation of CO over LaMn0.4Fe0.6O3 dues to the highest dispersion of Mn4+-O-Fe3+ species on the surface of LaMn0.4Fe0.6O3.
ISSN:1381-1169
1873-314X
DOI:10.1016/j.molcata.2014.04.001