Effect of P123 on Structure and CO Catalytic Oxidation Performance of CuO-CeO2 Catalysts

A series of CuO-CeO2 (n(Cu):n(Ce)=1 :9, 2:8, 3:7, 4:6, 5:5, 6:4, 7:3) catalysts with different Cu/Ce molar ratios (n(Cu):n(Ce)) were prepared by soft template hydrothermal method. The effect of n(Cu):n(Ce) and preparation methods (soft template hydrothermal method and co-precipitation without template method) on CO catalytic oxidation performance was investigated, and the structure, reduction features and surface chemical states of the CuO-CeO2 catalysts were characterized by XRD, TEM, low temperature adsorption-desorption, temperature programmed reduction (H-2-TPR) and XPS. The results show that with the increase of n(Cu):n(Ce), the CO catalytic oxidation activities of CuO-CeO2 catalysts increase firstly and then decrease. When the n(Cu):n(Ce) is 5:5, the CO catalytic oxidation activity of the catalyst is more than 90% at 100 degrees C. The large specific surface area, narrow pore structure distribution, high dispersion of active CuO species and the strong interaction between CuO and CeO2 of CuO-CeO2 catalyst prepared by soft template hydrothermal method are the main factors for its excellent CO catalytic oxidation activity.