Preparation of Au/sulfonated polystyrene catalysts for low-temperature CO oxidation

Supported Au catalysts for low-temperature CO oxidation were prepared by so lvated metal atom impregnation (SMAI) and conventional impregnation (Cl). X -ray photoelectron spectroscopy (XPS) investigations indicated that the ele mental gold in all the samples was in the metallic state, XRD measurements showed that the mean diameters of Au particles prepared by SMAI were smalle r than those prepared by Cl with the same gold content. Catalytic tests sho wed that the SMAI catalyst had higher CO oxidation activity than the CI cat alyst with the same compositions. Both SMAI and Cl catalysts exhibited high activity in low temperature CO oxidation. Full CO conversion was obtained at 323-383K.