Abstract: The bulk Structure and deformation of the perovskite oxides——LnAlO₃ were characterized by using XRDand the behavior of oxygen adsorption on these catalysts was investigated by using TPD.The corelation between the crystalline structure and the catalytic properties indicates that a high degree deformation of structure and a large amount of surface defect may cause a strong ability of oxygen adsorption, as a result, leading to a nice catalytic activation.An as-sumeption was made that the adsorbed oxygen atom is the species for the activation of methane.

Key words: Perovskite oxide, Lattice deformation, Oxidation coupling of methane