Application in the purification of automobile exhaust, burning oil, the car is moving in a large number of harmful exhaust emissions, containing carbon monoxide (CO), nitrogen oxides (NOX) and hydrocarbons (HC), the three poisons the atmosphere of serious harm . Currently purifying these toxins has three yuan precious metals (Pt, Rh, Pd) catalyst, palladium catalyst of rare earth and rare earth catalysts. All three catalysts have to join CeO2, to improve the amount of catalyst is 1-10%. Practical showed that adding CeO2 catalyst, may improve the catalytic activity, to improve the purification rate of poison; improve the catalytic ability of anti-drug; increase the strength of the catalyst 15% to 25%.