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Effect of Surface Decoration with LaSrFeO4 on Oxygen Mobility and Catalytic Activity of La0.4Sr0.6FeO3−δ in High-Temperature N2O Decomposition, Methane Combustion and Ammonia Oxidation Full article

Общее Language: Английский, Genre: Full article,
Status: Published, Source type: Original
Journal Applied Catalysis A: General
ISSN: 0926-860X , E-ISSN: 1873-3875
Output data Year: 2013, Volume: 457, Pages: 42-51 Pages count : 10 DOI: 10.1016/j.apcata.2013.03.007
Tags Ammonia oxidation, Lanthanum-strontium-ferrite mixed oxide, Layer-structured perovskites, Methane oxidation, Nitrous oxide decomposition, Oxygen mobility
Authors Ivanov D.V. 1 , Pinaeva L.G. 1 , Isupova L.A. 1 , Sadovskaya E.M. 1 , Prosvirin I.P. 1 , Gerasimov E.Yu. 1 , Yakovleva I.S. 1
Affiliations
1 Boreskov Institute of Catalysis SB RAS

Abstract: This article is an attempt to elucidate the role of lattice oxygen mobility in catalytic activity of Sr-substituted ferrites at high temperatures. For this goal, three catalysts with close element (La, Sr, Fe) content but different phases and surface compositions: LaSrFeO4(surface)–La0.4Sr0.6FeO3 (LSF-N), La0.15Sr0.85FeO3–La0.7Sr0.3FeO3 (LSF-C) and LaSrFeO4 have been studied in high temperature reactions of N2O decomposition, ammonia oxidation and methane combustion. The kinetics of 18O/16O oxygen exchange have been analyzed at 800 °C and 0.005 atm oxygen partial pressure, which is closely corresponding to the reaction conditions, and the rates of surface oxygen exchange and the coefficient of lattice oxygen diffusion have been evaluated. It allowed us to reveal the direct correlation between the surface exchange rate constant and the rate of N2O decomposition. For NH3 oxidation, evidence of the same order of the samples activity both in surface oxygen exchange and ammonia oxidation reaction was shown. In methane oxidation it was found that activity correlates with the rate of exchange for 20 monolayers of oxygen atoms indicating the growing influence of lattice oxygen mobility. The results show that improvement of catalytic properties can be achieved when synthesizing “LaSrFeO4(surface)–La0.4Sr0.6FeO3” composites. Such composites exhibit increased rate of surface oxygen exchange on retention of high lattice oxygen mobility, which can be attributed to formation of heterostructured interfaces.
Cite: Ivanov D.V. , Pinaeva L.G. , Isupova L.A. , Sadovskaya E.M. , Prosvirin I.P. , Gerasimov E.Y. , Yakovleva I.S.
Effect of Surface Decoration with LaSrFeO4 on Oxygen Mobility and Catalytic Activity of La0.4Sr0.6FeO3−δ in High-Temperature N2O Decomposition, Methane Combustion and Ammonia Oxidation
Applied Catalysis A: General. 2013. V.457. P.42-51. DOI: 10.1016/j.apcata.2013.03.007 publication_identifier_short.wos_identifier_type publication_identifier_short.scopus_identifier_type publication_identifier_short.rinz_identifier_type
Dates:
Submitted: Nov 28, 2012
Accepted: Mar 4, 2013
Published online: Mar 13, 2013
Published print: Apr 24, 2013
Identifiers:
publication_identifier.wos_identifier_type WOS:000319791000006
publication_identifier.scopus_identifier_type 2-s2.0-84876982031
publication_identifier.rinz_identifier_type 20441834
publication_identifier.accession_number_identifier_type 2013:683658
publication_identifier.chemical_accession_number_identifier_type 158:716929
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