Vehicle Exhaust Gas Purification Materials

With the rapid growth of quantity of motor vehicle,atmospheric pollution caused by motor vehicle exhaust emission is more and more serious,especially the danger of the carbon particles and NOx have caused governments great attention.Four-way catalytic technology of diesel vehicles can effectively reduce the exhaust of HC,CO,PM and NOx, and the removal of the four pollutants simultaneously be able to come up with a catalyst is particularly important,so the development of a new type of diesel engine exhaust gas catalyst become a competing subject.In this paper,developments of the current vehicle exhaust purification material and four types of diesel exhaust emissions and its harmful principle are mainly introduced,which purification technology are separately expressed and possibility of which simultaneous removal are explored.On this basis the four-way catalyst research is introduced and the advantages and disadvantages of noble metal catalysts and the nonnoble metal catalyst are mainly introduced.Finally,the perovskite-type oxides are explored from the structure and activity,perovskite-type oxides are selected as active component,through the alternative of the AB-bit elements on the basis of experiments and using of the method their catalytic activity must be evaluated,and then atalyst characterization is carried out.The results of removing the four exhaust emissions at the same time have been researched.So i can make some contributions for the development of new types of vehicle exhaust catalysts.