Sn修饰CuCeOx催化剂的高湿CO催化燃烧性能研究OA

Low-temperature CO oxidation technology has been widely applied in the field of environmental pollution control,yet challenges remain in CO purification under high-moisture environments.In this study,a series of CuCeOx-Sn catalysts supported on CeO2 were prepared via the excess impregnation method,and their catalytic performance in the low-temperature catalytic combustion of CO was systematically evaluated.The results indicate that CuCeOx-Sn0.1(with a Sn loading of 0.1％)exhibits the optimal low-temperature catalytic activity,with the lowest r50 and t90 values.The temperature for 90％CO conversion(t50 and t90)decreases progressively with increasing Sn loading up to 0.1％.Beyond this threshold,further Sn loading does not lead to a significant reduction in t90;in fact,t90 slightly increases compared to that observed at 0.1％Sn.Furthermore,this catalyst maintains stability during water-on/water-off switching tests,demonstrating excellent water resistance.Through characterization techniques including XPS,O2-TPD,CO-TPD and CO-TPSR,it is revealed that the introduction of Sn effectively increases the concentration of surface oxygen vacancies and promotes the activation and migration of surface adsorbed oxygen and lattice oxygen.