Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 24, Issue 3-4, Pages 193-205Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0926-3373(99)00111-3
Keywords
methane combustion; perovskite catalysts; catalyst characterisation
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Perovskite type La1-xSrxMnO3 (x = 0-0.5) oxides were prepared by the amorphous citrate process, characterised by X-ray diffraction, oxygen desorption, temperature-programmed reduction, infrared and X-ray photoelectron spectroscopic techniques, and tested for methane combustion within the 473-1073 K temperature range. Since catalyst activity was found to depend strongly on BET areas and to a lesser extent, on the degree of substitution (x), intrinsic activities were computed for La1-xSrxMnO3 catalyst series. Among the compositions investigated, the degree of substitution x = 0.2 showed the highest intrinsic activity within the temperatures explored. Characterisation techniques made possible to correlate catalytic performance with the structural characteristics of the oxides. The stability of Mn4+ is probably the most important parameter, but excess of oxygen and atomic surface composition should also be taken into account. (C)2000 Elsevier Science B.V. All rights reserved.
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