CO oxidation with Pt catalysts supported on different supports: A comparison of their sulfur tolerance properties

Insights into the CO oxidation and sulfur tolerance over supported Pt catalysts were carried out. The nominal 1 wt% Pt was loaded onto Al 2 O 3 , TiO 2 , SiO 2 , and SnO 2 by the incipient wetness impregnation method. Results showed that the presence of H 2 O would promote the catalytic oxidation of CO, and Pt/TiO 2 and Pt/SnO 2 catalysts showed superior catalytic activity. In combination with a series of characterizations, it was concluded that excellent catalytic activity was dependent on higher dispersion and strong metal support interaction (SMSI) whether water is present or not. In the coexistence of H 2 O and SO 2 , the sulfation of the support will lead to the deactivation of the catalyst. Sulfur resistance can be improved over TiO 2 with low sulfate decomposition temperature. While for Pt/SnO 2 catalyst, its superior sulfur-tolerance was strongly associated with its special core-shell structure. It provides guidelines for the development of catalysts with excellent CO catalytic activity and sulfur tolerance.