Investigation Of Nanofiber Catalysts Combined Non-thermal Plasma For VOCs Abatement

In recent years, air pollution had become more and more serious. As one of the most important pollutants, volatile organic compounds (VOCs) possess carcinogenic, mutagenic effects on human body. They can even form photochemical smog and PM2.5, which are secondary polltants. However, the total emission amount of VOCs had increased year by year and the composition of VOCs emission had become more and more complicated. Therefore, effective VOCs emission controlling is urgent. Two-stage plasma catalysis technology (TPC) has many advantages to removal dilute VOCs. Besides quick response, easy operation and wide range of application which plasma technology contains, TPC possesses the advantages of high efficiency, low energy consumption and less by-product. Nevertheless, the catalyst used in TPC system has limits in VOCs removal efficiency and by-product decomposition. In this work, electrospinning method was adopted to prepare nanofibers catalyst for VOCs abatement and the characteristics and activity of this catalyst was studied. After that, we added this catalyst in TPC system in order to explore the reaction rules in plasma system and TPC system.Chapter one is the background review. Fistly, the harm of VOCs, the trend of VOCs emission and the conventional VOCs removal technology were stated. Secondly, the common catalysts used in VOCs oxidation and the electrospinning method used for preparing nanofibers catalysts was introduced, then the application of TPC in VOCs emission control area was illustrated. Finally, the research approach of nanofibers catalyst combined with TPC system was proposed.Chapter two introduced the materials, installments and test methods used in the experiment. It mainly concluded the installments, processes, characteristic method and activity test method for nanofibers catalyst and the installments, processes, electrical parameter and by-product measuring method in TPC system.Chapter three is on the researches of nanofibers catalyst for VOCs abatement. Fistly, the preparing method for nanofibers catalyst with different Cu/(Cu+Ce) molar ration was introduced. After that, the characterization of catalyst by SEM, EDX, TEM, XRD, XPS,H2-TPR and N2sorption and the activity results were illustrated. After the comprehensive analysis of mechanism of catalytic reaction over nanofibers, the most active nanofibers catalyst (Cu0.50-NFs) possesses1. Nanofibrous morphology with large specific surface area,2. Abundant oxygen vacancies,3. Cations with unusual oxidation states.Chapter four is on the researches of TPC system which adopted nanofibers catalyst. The test of the relationship between VOCs removal efficiency, by-product and peak voltage, initial concentration, SIE. The reaction mechanism of TPC system was analyzed. Then the VOCs removal efficiency was test in curtain DBD reactor with large flow.Chapter five mainly includes the conclusions and the innovative point of this dissertation, and the prospect of future work.