CO Oxidation over Bimetallic Au-Pd Supported on Ceria-Zirconia Catalysts: Effects of Oxidation Temperature and Au:Pd Molar Ratio

Au-Pd supported on ceria-zirconia catalysts, with Au:Pd molar ratios in the 1:1-10:1 range, have been prepared using deposition precipitation of Au followed by impregnation with Pd. The resulting Au-Pd supported catalysts were activated by oxidation at 350, 450 and 700 degrees C. The oxidation at 700 degrees C led to the formation of large Au-Pd alloy nanoparticles showing lower catalytic activity for CO oxidation. The Au-Pd/Ce0.62Zr0.38O2 catalyst with the highest Au:Pd ratio, 10:1, exhibited the highest CO oxidation activity.