Experimental Study Of Diesel NOx Catalytic Converter

With the development of society and the improvement of people's live, environmental problem is becoming the focus of the world. Diesel engine is widely used as power source of vehicles and dynamic equipments for its simple construction, good reliability, high efficiency, strong dynamic performance and low carbon monxide and hydrocarbon. At the same time, the emission regulations related to the diesel engines are becoming more and more stringent. After treatment is considered the development trend of diesel emission control and catalytic technologies are believed to be the most effective way to reduce the nitric oxide of diesel. Developing and testing of NOx catalytic converter presented in excess oxygen environment are subjects of the research.Development of catalysis applied in vehicle emission control and the theory of catalytic reaction are introduced. Cu-ZSM-5, Cu-TS-1 and noble metal catalysis are prepared with new methods for diesel nitric oxide control. Catalytic performance and endurance of the converters are studied on test bench. Catalytic reaction mechanism of NO on the surface of Cu-ZSM-5 is analyzed and the Arrhenius equation of the reaction is deduced. And the experimental results carried on a diesel show that in the presence of real diesel exhaust, for copper catalysis, NO conversion is not high and endurance is not satisfying. Comparing with copper catalysis, noble metal catalysis has a better endurance performance and wide reaction temperature window. But it is still far from reality use. The key is to develop new catalysis, improve the catalytic conversion when there is excess oxygen and keep it performance when it is prepared into a ceramic converter.