Spin glass formation in La0.9Sr0.1CoO3 catalyst for flameless combustion of methane

Spin glass formation in La0.9Sr0.1CoO3 catalyst for flameless combustion of methane

Two samples of composition La0.9M0.1CoO3 (M = Sr, Ce) have been compared as catalysts for the flameless combustion of methane. The former showed a lower activity than the latter and this difference was enhanced at lower temperature. Aiming at understanding the origin of this behaviour, EPR analysis...

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Veröffentlicht in:Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Molecular and biomolecular spectroscopy, 2000-02, Vol.56A (2), p.301-307
Hauptverfasser: Oliva, C, Forni, L, Vishniakov, A V
Format: Artikel
Sprache:eng
Schlagworte:
Catalysis
Cerium
Cobalt
Electron Spin Resonance Spectroscopy
Glass
Lanthanum
Methane - chemistry
Microwaves
Oxidation-Reduction
Oxides
Spin Labels
Strontium
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Forni, L
Vishniakov, A V
description Two samples of composition La0.9M0.1CoO3 (M = Sr, Ce) have been compared as catalysts for the flameless combustion of methane. The former showed a lower activity than the latter and this difference was enhanced at lower temperature. Aiming at understanding the origin of this behaviour, EPR analysis was carried out at temperatures down to 100 K. At T < 245 K a zero-field intense feature appeared with the M = Sr sample only, characterized by opposite phase with respect to the g approximately 2 line. This zero-field line was attributed to microwave absorption by spin glass formed by cobalt- and oxygen-based paramagnetic ions. The tendency to strong interaction among these species could also be a reason of the low oxygen availability for the catalytic methane oxidation at higher temperature.
doi_str_mv 10.1016/S1386-1425(99)00240-1
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subjects Catalysis
Cerium
Cobalt
Electron Spin Resonance Spectroscopy
Glass
Lanthanum
Methane - chemistry
Microwaves
Oxidation-Reduction
Oxides
Spin Labels
Strontium
title Spin glass formation in La0.9Sr0.1CoO3 catalyst for flameless combustion of methane
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