A series of xCeO_2/kaolin catalysts of different CeO_2 contents were prepared by impregnation method.The as-prepared catalysts were characterized by XRD,N_2 adsorption-desorption,H_2-TPR,XPS,and their catalytic performances for the oxidative dehydrogenation of propane to propene were investigated to determine the effects of CeO_2 contents,meanwhile in situ electric conductivity of catalysts were measured.The results showed that the optimized catalyst with 17.92% conversation of propane at 500 ℃was 8% CeO_2/...