Influence of the preparation conditions on the properties of perovskite-type oxide catalysts
Abstract The effect of the precipitation conditions on the catalytic and structural properties of LaMnO 3+δ , LaCoO 3−δ and LaCo 1− y Mn y O 3±δ perovskites ( y = 0.33, 0.5, 0.67) has been studied by means of powder X-ray diffraction, temperature programmed oxygen desorption, textural measurements and catalytic activity measurements in methane total oxidation. Ageing time of the precipitate and H 2 O 2 content in the precipitant influences crystallinity and phase composition of the perovskite samples pretreated at 600 and 800 °C. The results of the catalytic activity are affected by the presence of oxide admixtures and crystallinity.