Study on the Catalytic Performance of CuO-CeO2 Catalysts Doped with Transition Metal Oxides for Selective CO Oxidation

A series of CuO-CeO₂ catalysts doped with transition metal oxides were prepared by co-precipitation method for selective CO oxidation and the effects of the additives on the catalytic performance were examined by H₂-TPR, in-situ DRIFTS techniques. The results showed that the main CO adsorption site on CuO-CeO₂ series catalysts was Cu⁺ species. The catalytic activity at lower temperatures was related to the CO desorption. The doping of ZnO improved the catalytic activity evidently and the CO conversion and selectivity of Cu₁Zn₁Ce₉O₈ could reach 99.9% and 76.4% at 160°C, respectively. ZnO not only stabilized the reduced Cu⁺ species, but also increased the capacity of CO adsorption.