Effect of CeO2-ZrO2 composite oxide on performance of catalyst with metal monolith substrate

In this paper, the CeO2-ZrO2 composite oxide with different composition was prepared by dip-coating method. Meanwhile, the crystalline phase structure, reduction performance, surface area and thermostability of the oxide were characterized by using XRD, H-2-TPR and BET. The results showed that the solid solution was formed in the CeO2-ZrO2 composite oxide, and Ce0.6MZr0.4O2 was more easily to be reduced by H-2, compared with Ce0.90Zr0.10O2, the parameters of its crystal cells were not obviously changed, and the surface area was still as high as 11.8 m(2)/g when calcined at 1100 degreesC for 4 h. The catalytic activity of Pt-Pd-Rh/CeO2-Al2O3 and Pt-Pd-Rh/CeO2-ZrO2-Al2O3 was investigated by using simulating emission gas of 2-stroke motorcycle, and the results revealed that the calcined catalysts still have high activity. In the lean oxygen area, the Pt-Pd-Rh/Ce0.6Zr0.4O2-Al2O3 catalyst, which has superiority of activity for hydrocarbon oxidation, over other two catalysts, is a good catalyst with high thermostability.