Study of Ce0.7Sn0.3O2 supported PdO catalysts for CO oxidation

Palladium supported by Ce_0.7Sn_0.3O₂ has been prepared by an impregnation method, and used for low temperature carbon monoxide oxidation. They were characterized by means of XRD and H₂-TPR techniques. For PdO/Ce_0.7Sn_0.3O₂ catalyst, three reduction peaks (α, β and γ) are observed. The β peak contributes to the reduction of PdO species and Sn⁴⁺ species on the surface of Ce_0.7Sn_0.3O₂; β peak to the reduction of bulk SnO₂ and surface Ce⁴⁺and the γ peak to the reduction of bulk CeO₂. The increase of Pd loading from 0 to 0.75% enhances oxidation of CO, further increase of the Pd content affects the catalytic activity but slightly. XRD and TPR results show that highly dispersed Pd on the surface of the support is the active species for CO oxidation. This revised version was published online in June 2006 with corrections to the Cover Date.