Abstract: The correlations of the calcination temperature,structure and catalytic activity for the oxidative coupling of methane on the LiLa_0.5Ti_0.5O_2+λcatalysts whose main phase and major active phase is Perovskite-type ternary complex oxide LaTi_1-yLi_yO_3-λhave been studied.The surface and bulk structures of the catalysts were characterized by means of XRD,XPS,IR,BET and so on.The results cleary indicated that the effect of calcination temperature on the activity for the oxidative coupling of methane is twofold.On one hand, it is favorable for Li⁺substitution for Ti³⁺to enter into the lattice of LaTiO₃and produce more oxygen vacancies in which active oxygens are formed;however,excessively high calcination temperature make the amount of Li⁺substitution for Ti³⁺lower,due to a little change of structure or phases for the catalyst.On the other hand,the conversion of CH₄drops because of the decrease of surface area,when the calcination temperature is raised.

Key words: Oxidative coupling of methane, Calcination temperature, Titanium-lanthanumlithium perovskite oxide