Simultaneous Removal Of NOx And Soot By High Frequency Dielectric Barrier Discharge And Catalysis

Diesel engines have drawn great attention from all over the world and the usage of diesel vehicles is rapidly increasing because diesel engines have higher efficiency than gasoline engines. The main pollutants from diesel engines are NOx and soot. Both of them are harmful to people's health and will lead to environmental pollution, especially in the urban areas. Nowadays, the emission regulations on diesel engines are becoming more and more stringent. Kinds of measures were taken to meet these regulations, such as high-pressure fuel injection, injection delay, injection rate control, inter-cooled turbocharger, exhaust gas reccirculation, and newly developed combustion system. But all of these measures can not essentially reduce the emissions of NOx and soot at the same time due to the trade-off between Nox formation and soot formation, therefore the diesel exhaust aftertreatment is necessary to reduce both NOx emission and soot emission.Most studies on simultaneous removal of NOx and soot is based on catalysis methods, in which the properties of catalysts affect greatly the reaction process. In this work, partial substitution of La or Mn in LaMnO3 as well as its effects on simultaneous removal of NOx and soot was investigated. The catalytic properties of catalysts were evaluated using temperature programmed reaction (TPR) method. The catalyst with best comprehensive performance was used to study the influences of reaction parameters on simultaneously catalytic removal of NOx and soot. In addition, high frequency dielectric barrier discharge assisted catalysis was proposed to promote the removal efficiency. The detailed researches can be summarized as following.