Effect of CeO2 on oxidation of CO over Pd/Al2O3 catalyst

Surface reaction properties of CO, the desorption properties of surface oxygen over Pd catalysts and their carriers were investigated by means of TPSR-MS and TPD-MS. The oxidation activity of CO on these catalysts was also examined at different concentrations of oxygen. It was found that the desorbed amount of CO2 and the order of peak temperature were in good agreement with their activities. The amount of CO2 in desorbed product on oxidized alumina-supported Pd was more than that on reduced alumina-supported Pd, the disproportionation reaction of CO on H-2-reduced Pd/Al2O3 would form carbon and CO2. The results of O-2-TPD and CO-TPSR showed that the addition of CeO2 would promote the desorption of surface oxygen and the surface reaction of CO on Pd/Al2O3.