Perovskite-type La_(1-x)Ce_xMnO_3(x = 0-10%) catalysts were prepared by flame spray pyrolysis and their activities during the catalytic oxidation of benzene were examined over the temperature range of100-450℃.The structural properties and reducibility of these materials were also characterized by X-ray diffraction(XRD),N_2 adsorption/desorption,H_2 temperature-programmed reduction(H_2-TPR) and X-ray photoelectron spectroscopy(XPS).The incorporation of Ce was found to improve the benzene oxidation activity,and the perovskite in which x was 0.1 exhibited the highest activity.Phase composition and surface elemental analyses indicated that non-stoichiometric compounds were present.The incorporation of Ce had a negligible effect on the specific surface area of the perovskites and hence this factor has little impact on the catalytic activity.Introduction of Ce4~(4+) resulted in modification of the chemical states of both B-site ions and oxygen species and facilitated the reducibility of the perovskite.The surface Mn~(4+)/Mn~(3+)ratio was increased as a result of Ce~(4+) substitution,while a decrease in the surface-adsorbed O/lattice O(O_(ads)/O_(latt)) ratio was observed.The relationship between the surface elemental ratios and catalytic activity was established to allow a better understanding of the process by which benzene is oxidized over perovskites. Perovskite-type La 1- (1-x) Ce x M nO 3 (x = 0-10%) catalysts were prepared by flame spray pyrolysis and their activities during the catalytic oxidation of benzene were examined over the temperature range of 100-450 ° C. The structural properties and reducibility of these materials were also characterized by X-ray diffraction (XRD), N 2 adsorption / desorption, H 2 temperature-programmed reduction (H_2-TPR) and X-ray photoelectron spectroscopy oxidation activity, and the perovskite in which x was 0.1 exhibited the highest activity. Phase composition and surface elemental analyzes indicated that non-stoichiometric compounds were present. the incorporation of Ce had a negligible effect on the specific surface area of ​​the perovskites and so this factor has little impact on the catalytic activity. Introduction of Ce4 ~ (4+) resulted in modification of the chemical states of both B-site ions and oxygen species and facilitated the reducibility of th e perovskite.The surface Mn ~ (4 +) / Mn ~ (3+) ratio was increased as a result of Ce ~ (4+) substitution, while a decrease in the surface-adsorbed O / lattice O (O_ (ads) / O_ (latt)) ratio was observed. The relationship between the surface elemental ratios and catalytic activity was established to allow a better understanding of the process by which benzene is oxidized over perovskites.