Selective oxidation of diphenylmethane to benzophenone requires actíve and selective catalysts.The framework incorporation ofcerium in AlPO-5 molecular sieves creates active cerium sites in isolation.These active sites are responsible for selective oxidation.Ceriumincorporated AlPO-5 with different AlCe ratios were synthesized,and the vapor phase oxidation of diphenylmethane in air over these catalysts was studied at 250,275,300,325,and 350 ℃.The diphenylmcthane conversion and selectivity for benzophenone were more than 90％.CeAlPO-5(25) was found to be more active than other catalysts.The stability of the catalyst was verified by the time on stream study which indicated steady diphenylmethane conversion and benzophenone selectivity.Hence framework incorporated CeAlPO-5 molecular sieves are stable and active catalysts for the selective oxidation of diphenylmethane.