Crystalline phases of the supported La Sr Mn O catalysts for hydrocarbon combustion prepared by impregnation have been identified by X ray diffraction (XRD) analysis.The results show that perovskite type oxide La 0.8 Sr 0.2 Mn 0.3 is successfully formed on the surface of porous ceramics.The catalytic activities of the bulk and supported perovskite for xylene oxidation were studied comparatively