INFLUENCE OF THE PREPARATION CONDITIONS ON THE PROPERTIES OF PEROVSKITE-TYPE OXIDE CATALYSTS

The effect of the precipitation conditions on the catalytic and struct ural properties of LaMnO3+delta, LaCoO3-delta and LaCo1-yMnyO3+/-delta 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 oxi dation, Ageing time of the precipitate and H2O2 content in the precipi tant influences crystallinity and phase composition of the perovskite samples pretreated at 600 and 800 degrees C. The results of the cataly tic activity are affected by the presence of oxide admixtures and crys tallinity.