Catalytic Performance of Ce/Zr Oxides Catalysts for Soot Combustion

摘要

Catalytic performances of a series Ce/Zr oxides(Ce_x Zr_(1-x)O_2) for soot combustion were investigated. The catalytic activities for soot combustion were affected by both the Ce/Zr ratio and the oxygen storage capability of Ce/ Zr oxides. O_2-TPD and TG-DTA results indicate that Ce_xZr_(1-x)O_2 can release its lattice oxygen continuously and promote soot combustion even no oxygen occurs in the reaction atmosphere. Among these Ce/Zr oxides, Ce_(0.5)Zr_(0.5) O_2 has the best catalytic activity, and the ignition temperature of soot combustion was about 410℃, which is close to the practical exhaust temperature of the diesel engine.