Study On Treatment Of Organic Waste Gas From Butadiene Styrene Rubber By Catalytic Combustion Process

With the rapid development of the global industry, modern industry produce amount of “three wastes”, especially the emission of exhaust gas, which deeply affect man’s lives. In recent years, the frequent haze weather was directly related to the emission of exhaust gas, especially the emission of VOCs. Most of the VOCs are volatile and toxic, which is difficult to prevent and control, it also can participate in the formation of photochemical smog and aerosols. The effective control of VOCs is becoming a part of the atmospheric science that must be addressed. The petrochemical industries are the key enterprises, producing amount of VOCs. In order to alleviate the VOCs pollution of the petrochemical rubber enterprise, titanium-based catalysts were prepared by sol-gel method, and its modification of Ce-doping. The effect of the active ingredient loaded, calcination temperature and Ce content on catalytic combustion of VOCs catalyst performance was investigated. The catalysts were characterized by XRD and BET and the possibility passway of styrene over catalytic mechanism of titanium-based catalyst was analysised. The results achieved are as follows.The results of VOx/TiO₂ and modified catalyst over catalytic combustion performance showed that the catalyst has better performance when the radio of V/Ti was 0.12, and the calcination temperature was 500 ℃ for 5h. With this catalyst, the ignition temperature T50 was 230℃ and the maximum conversion of styrene was 70%. The catalyst had best catalytic performance after modified by the Ce when the radio of Ce / Ti was 0.05. The temperature of ignition and the complete conversion of the styrene temperature were 170 ℃ and 260 ℃, respectively. Meanwhile the modified catalyst has good durability. The results of XRD, BET and SEM showed that the modified catalyst had complete anatase structure, large surface area and the active component is uniformly dispersed in a carrier surface, and has a strong oxygen storage capacity, so the higher the catalyst activity.The results of MnOx/TiO₂ and modified catalyst over catalytic combustion performance showed that the catalyst has better performance when the radio of Mn/Ti was 0.1, and the calcination temperature was 500℃ for 5h. With this catalyst, the ignition temperature T50 was 150℃ and the complete convertion temperature was 260℃ The catalyst had best catalytic performance after modified by the Ce when the radio of Ce / Ti was 0.05. The temperature of ignition temperature were 170℃ and and the complete conversion temperature dropped 40℃, which ignition temperature, he complete conversion temperature, and stability were better than vanadium catalyse. The emissin concentration of styrene was 60mg/m3 at the best times, which has hit the state limits. The results of XRD, BET and SEM showed that, due to the synergistic effects of Ce and Mn, the particals on the surface of catalyst become smaller, and the crystal sructure of the catalyst was improved, and the active component was dispersed. In addition, because of the special oxygen storage capacity, the performance of the catalyst was improved。Through the analysis of the process of styrene catalytic combustion and the possibility of the action mechanism, we know that, anion vacancy on the TiO₂ carrier surface was the Intermediate material between carrier and transition metals, which can bring strong interaction to effectively disperse the active component, Improve the microstructure of catalyst, Improve the performance of catalyst; Besides, the process of styrene catalytic combustion was in accordance with the action mechanism of adsorption-oxidation...