Synthesis and characterization of La1-xSrxCoO3-d perovskites prepared by spray-pyrolysis

Jose Luis Hueso Manuel Ocaña Alfonso Caballero Agustin R. González-Elipe 1

1. Instituto de Ciencia de Materiales de Sevilla (ICMSE), Avda. Americo Vespucio, 49, Sevilla 41092, Spain

Abstract

Perovskite-type mixed oxides have long been recognized as active oxidation/reduction catalysts with potential applications in environmental catalysis. These complex oxides have been studied as potential substitutes of noble metal supported exhaust control catalysts. Among the wide range of samples investigated, Co and Mn perovskites have shown the best catalytic activities and oxidation stabilities. These compounds can modify its standard ABO3 structure by partial substitution of cations in A or B positions.

In this work we have prepared La1-xSrxCoO3-d cobaltites with different Sr2+ content (0<x<0.75). A spray pyrolysis method has been applied to synthesize the samples. This method is found to be feasible and powders with proper stoichiometry are obtained from nitrate liquid precursors, at lower temperatures than solid methods (i.e. 873 K) after calcination.

Single crystal phases with rombohedral distorted structures are determined by XRD analysis. FE-SEM, TEM, XAS and XPS techniques are also used for bulk and surface characterization of powders. Finally, different temperature programmed combustion experiments carried out with the perovskites have confirmed the high catalytic activity of these oxides towards oxidation processes.

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Presentation: Poster at E-MRS Fall Meeting 2006, Symposium B, by Agustin R. González-Elipe
See On-line Journal of E-MRS Fall Meeting 2006

Submitted: 2006-05-16 15:35
Revised:   2009-06-07 00:44
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