Enhanced activity of Au catalysts from extra-high surface area CeO₂ for CO oxidation

Abstract

A series of Au/CeO₂ catalysts has been prepared with CeO₂ of varying surface areas and tested for low-temperature CO oxidation. With a higher surface area support, the Au/CeO₂ catalysts show a higher catalytic activity for CO oxidation (0.175 mol_CO g_Au^-1 h^-1 at

0 °C). Higher oxygen vacancies provided by the formation of solid solution of Au_xCe_1-xO_2-_δ and higher CO chemisorption sites related to Au species are responsible for the enhanced activity.