Abstract
The aim of this work was to study the effect of two precipitation pHs and three different ageing times on the preparation of simple LaFeO3 perovskites for their use as catalysts in the methane combustion. Absorption atomic spectroscopy (AAS), BET specific area measurements, XRD analysis, Raman, XPS, TGA and DTA analysis, TPR and TPO profiles revealed that significant changes in chemical composition, surface area and surface composition was produced at pH 8 when the ageing time was changed, leading to solids with different catalytic activity in methane combustion. At the higher precipitation pH studied, pH 10, the physical chemistry properties for all the samples obtained at different ageing times are almost identical, and therefore the solids exhibit similar activities in the combustion reaction. The catalysts were found to be active for methane combustion, and the effect of the perovskites structure and surface properties became more important
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