The catalytic activity for CH4 and CO oxidation of LaMOs (M is transition metal ion) perovskite-type oxide prepared by copptn. and mixing methods has been studied by activity evaluation, magnetic measurement, element anal., TPR, magnetic measurement, an explaination has been put up to the results which show a tri-peak pattern for 3d-electron no. vs catalytic activity. Proportional relations have been found between catalytic activity and either surface oxygen bonding energy or TPSR active oxygen content in LaMO3 compounds The valence of M ions in for Ti and V, n > 3; for Cr, n ?3; for the others, n < 3. The active oxygen distribution in the series oxides has been discussed.

Key words: ATOMIC ABSORPTION SPECTROPHOTOMETRY, X-RAY DIFFRACTION ANALYSIS, METHANE, ELECTRONIC STRUCTURE, CATALYTIC OXIDATION, CARBON OXIDE, TEMPERATURE PROGRAMMED REDUCTION, TEMPERATURE PROGRAMMING SURFACE REACTION