The Organic Waste Gas Disposed By Composite Catalyst Under Plasma Treatment

The emission of volatile organic compounds（VOCs） are increasing year by year and have enormous harm to our survival environment. Low temperature plasma technology has been extensive research for the removal of VOCs because of its advantages like high efficiency and wide application. While a single low temperature plasma technology also has the high energy consumption and by-products. With the advantages of higher remove efficiency, CO₂ selectivity and less secondary pollutants, the non-thermal plasma technique assisted with catalyst on decomposition of VOCs has caused wide public concern. Based on the study of a large number of references, the catalytic reaction mechanism of VOCs in catalysis-assisted plasma method is proposed and the existing problems of catalysts used in catalysis-assisted plasma method are discussed.This thesis is divided into four main parts:（1） Using single plasma discharge degradation of organic waste gas of benzene, testing the degradation rate effect of benzene initial concentration, gas flow rate and discharge power.To provide reference for subsequent experiments.（2） α-MnO₂ and β-MnO₂ are prepared by hydrothermal method, the results show that β-MnO₂ catalyst combined plasma degradation of benzene was better, the content of exhaust ozone decreased 72.5%; the degradation rate of benzene was 64.1% at 36 W.（3） Based on the β-MnO₂, and the CuMnO_x catalyst have been prepared by impregnation method, and application of SEM, XRD, XPS, BET method of catalysts have been characterized; plasma-driven catalysis（PDC） reactor was used to study the degradation effect of benzene; influencing factors such as the conditional reaction（initial concentration, flow velocity, power）, catalyst composition and calcination temperature are taken into consideration,it determines the optimum preparation conditions of composite catalyst.The results show that the highest activity was achieved on the copper and manganese mixed with the molar ratio of 1:4 calcined at 500℃for 4h.The content of exhaust ozone decreases 80.0%; the degradation rate of benzene can reach 72.3% at 36 W.（4） Based on the β-MnO₂, FeMnO_x catalyst are prepared by impregnation method.Compared with the CuMnO_x catalyst, FeMnO_x catalyst activity was better, the highest activity was achieved on the iron and manganese mixed with the molar ratio of 1:3 calcined at 600℃for 4h.The content of exhaust ozone decreases 82.5%; the degradation rate of benzene can reach 74.5% at 36 W.