Catalytic oxidation of benzene over CuO/Ce_(1-x)Mn_xO2 catalysts

摘要

Ce_(1-x)Mn_xO2 (x = 0.1-0.6) mixed oxides were used as supports for preparing 7%CuO/Ce_(1-x)Mn_xO2 catalysts by impregnation, for use in the total oxidation of benzene. At x=0.1 and 0.2, most of manganese was fixed in the fluorite structure of CeO2 to form a solid solution. When x exceeds 0.3, some of the manganese appeared as well dispersed MnO_x. The redox interaction between CuO and Ce_(0.7)Mn_(0.3)O2 facilitated the activation of surface oxygen for the oxidation of benzene. The defective sites of oxygen on the dispersed MnO_x also enhanced the adsorption and oxidation of benzene. 7%CuO/Ce_(0.7)Mn_(0.3)O2 catalyst was a good candidate for replacing noble metal catalysts for the removal of benzene in low concentrations at low temperature.