A novel catalyst for CO oxidation at low temperature

Supported catalysts of palladium over ceria-titania mixed oxides (Pd/CeO2-TiO2) were prepared and tested for carbon monoxide oxidation. The catalysts exhibited high catalytic activity at room temperature. The Pd/CeO2-TiO2 catalyst was more active than Pd/CeO2, Pd/SnO2-TiO2, Pd/ZrO2-TiO2, Pd/Al2O3-TiO2 and Pd/TiO2 catalysts under the same conditions examined. The effects of preparation methods of the support, the mole ratio of ceria and titania in mixed supports as well as Pd loading upon the catalytic activity of CO oxidation were investigated. Among the Pd/CeO2-TiO2 catalysts, the best one corresponds to the Pd loading of 1.0 wt% or above, and the mole ratio of ceria and titania ranging from 1 : 7 to 1 : 5. The steady-state catalytic performance of such catalyst was recorded without any deactivation over 8 h time-on-stream in the present study.