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In situ spectroscopic characterization of some LaNi1-xCoxO3 perovskite catalysts active for CH4 reforming reactions

Published online by Cambridge University Press:  07 June 2012

Rosa Pereñiguez ,
Victor M. Gonzalez-Delacruz ,
Fatima Ternero ,
Juan P. Holgado  and
Alfonso Caballero
Rosa Pereñiguez
Affiliation:
Instituto de Ciencia de Materiales de Sevilla and Dep. Química Inorgánica (CSIC-Universidad de Sevilla). Avenida Américo Vespucio, 49, 41092 Sevilla (España)
Victor M. Gonzalez-Delacruz
Affiliation:
Instituto de Ciencia de Materiales de Sevilla and Dep. Química Inorgánica (CSIC-Universidad de Sevilla). Avenida Américo Vespucio, 49, 41092 Sevilla (España)
Fatima Ternero
Affiliation:
Instituto de Ciencia de Materiales de Sevilla and Dep. Química Inorgánica (CSIC-Universidad de Sevilla). Avenida Américo Vespucio, 49, 41092 Sevilla (España)
Juan P. Holgado
Affiliation:
Instituto de Ciencia de Materiales de Sevilla and Dep. Química Inorgánica (CSIC-Universidad de Sevilla). Avenida Américo Vespucio, 49, 41092 Sevilla (España)
Alfonso Caballero*
Affiliation:
Instituto de Ciencia de Materiales de Sevilla and Dep. Química Inorgánica (CSIC-Universidad de Sevilla). Avenida Américo Vespucio, 49, 41092 Sevilla (España)
*
*Email: caballero@us.es
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Abstract

Lanthana-supported Ni and Co catalysts were investigated by “operando” techniques (XAS and APPES) for methane reforming reactions. The samples were prepared by the “solid phase crystallization” method (spc), where the precursors La(Ni1-xCox)O3 contains homogeneously distributed metals (Ni, Co) in the crystal structure (perovskite), which, on further reduction, result in the formation of catalytic system Ni1-xCox/La2O3. The monometallic samples (NiLaO3, CoLaO3) have been compared with a bimetallic system of an intermediate composition Ni0.5Co0.5LaO3. This “operando” study has allowed us to obtain important conclusions about the bimetallic particles and the metal-support interactions. The data revealed the formation of bimetallic particles (NiCo); on these ones, the Ni avoids the Co oxidation during the reaction. However, this protection does not induce an improvement in the activity, which presents an intermediate behaviour between Ni/La2O3 and Co/La2O3. These bimetallic particles form a pseudo-alloy with the surface enriched in cobalt (under reduced conditions), resulting nearly in a core-shell structure (Ni@Co).

Keywords

x-ray photoelectron spectroscopy (XPS)extended x-ray absorption fine structure(EXAFS)catalytic
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1446: Symposium U – Materials for Catalysis in Energy , 2012 , mrss12-1446-u03-37
Copyright
Copyright © Materials Research Society 2012

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References

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