Application of Ceria and Lanthana in Catalyst for Cleansing Exhaust Gas of Car

The importanCe of rare earths being applied in the catalyst for cleansing the exhaust gas out of car was introduced. The acting mechanism of ceria and lanthana in catalyst and its influencing factors were discussed, and its prospect was forecasted. Pt-Rh precious metals three-way catalyst is widely used for decontaminating the exhaust gas of car now. Ceria and lanthana, which can decrease the content of Pt-Rh and increase the content of Pd in the catalyst, are used as additive in the decontaminating catalyst in order to solve the problem of the supply and demand of Pt and Rh.It is reported that increasing the activity of the coat on catalyst, regulating automatically the ratio of air and fuel, acting as catalyst-accelerator, and improving its properties such as thermal stability and strength may primarily amount for the catalyzing, mechanism of ceria and lanthana. The factors, such as their interaction, additive methods, and effects of cocatalyst ZrO2, CuO, AgO, etc. , will remarkably influence the catalyzing function of ceria and lanthana.