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Influence of Oxygen Mobility on Catalytic Activity of La-Sr-Mn-O Composites in the Reaction of High Temperature N2O Decomposition Full article

Общее Language: Английский, Genre: Full article,
Status: Published, Source type: Original
Journal Journal of Catalysis
ISSN: 0021-9517 , E-ISSN: 1090-2694
Output data Year: 2009, Volume: 267, Number: 1, Pages: 5-13 Pages count : 7 DOI: 10.1016/j.jcat.2009.07.005
Tags Lanthanum-strontium-manganese mixed oxide, Layer-structured perovskites, Nitrous oxide decomposition, Oxygen diffusion, Oxygen isotope exchange, Oxygen vacancies, SSITKA
Authors Ivanov D.V. 1 , Sadovskaya E.M. 1 , Pinaeva L.G. 1 , Isupova L.A. 1
Affiliations
1 Boreskov Institute of Catalysis SB RAS

Abstract: Previous study suggested that either high oxygen mobility in layer-structured (La1−ySry)2MnO4 perovskite or high oxygen diffusion through intergrain boundaries is the reason why multiphase La1−xSrxMnO3 samples exhibit a high catalytic activity in high temperature N2O decomposition. The absence of inhibiting effect of oxygen on the reaction rate for these samples allows us to suppose that surface segregation of layered perovskite increases oxygen mobility and facilitates oxygen desorption from the surface. In this paper, we aimed at determining the influence of surface composition on oxygen mobility and catalytic activity in high temperature N2O decomposition. By means of steady-state isotopic transient kinetic analysis (SSITKA) the mechanism and kinetics of oxygen exchange were elucidated for three La1−xSrxMnO3 (x = 0, 0.3, and 0.5) samples considerably differing in phase composition and catalytic activity. The results obtained indicate that inactive single-phase LaMnO3 exhibits both the lowest rate of oxygen exchange on the surface and the lowest rate of oxygen diffusion in the bulk. For La0.3Sr0.7MnO3, the increased values of both rates as compared with LaMnO3 can be interpreted as the appearance of a fast pathway of oxygen transfer through vacancies formed in the perovskite lattice to compensate the reduced cation charge. The highest values of the content of fast-exchangeable oxygen and oxygen diffusion coefficient were found for a multiphase sample containing layered perovskite, thus providing a strong correlation between oxygen mobility and catalytic activity in the reaction of nitrous oxide decomposition.
Cite: Ivanov D.V. , Sadovskaya E.M. , Pinaeva L.G. , Isupova L.A.
Influence of Oxygen Mobility on Catalytic Activity of La-Sr-Mn-O Composites in the Reaction of High Temperature N2O Decomposition
Journal of Catalysis. 2009. V.267. N1. P.5-13. DOI: 10.1016/j.jcat.2009.07.005 publication_identifier_short.wos_identifier_type publication_identifier_short.scopus_identifier_type publication_identifier_short.rinz_identifier_type
Dates:
Submitted: Apr 29, 2009
Accepted: Jul 11, 2009
Published online: Aug 26, 2009
Published print: Oct 1, 2009
Identifiers:
publication_identifier.wos_identifier_type WOS:000272263100002
publication_identifier.scopus_identifier_type 2-s2.0-69949124203
publication_identifier.rinz_identifier_type 15294446
publication_identifier.accession_number_identifier_type 2009:1126852
publication_identifier.chemical_accession_number_identifier_type 151:557072
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