Influence Of Catalyst Composition On Decomposition Of Adsorbed Toluene With Non-thermal Plasma

Volatile organic compounds(VOCs) is an important component of atmospheric pollution, will cause serious harm to the environment and human health.With industrial development and the improvement of human living standards, seeking and using the economic and effective method to cure VOCs become imperative.Non-thermal plasma technology with low cost, simple process and the advantages of wide scope of application become an important research direction of VOCs abatement, especially in the treatment of the printing, spraying and other industries having the characteristics of low concentration, big air volume of organic waste gas shows a good advantage.For VOCs insufficient degradation and producing by-products in the process of governance, the paper selected commonly used organic solvent toluene as the research object, preparing different components of catalyst, respectively studied non-thermal plasma circulation-degradation system and catalytic combined with non-thermal plasma circulation-degradation system to deal with adsorbed toluene, and examined the adsorption storage capacity, voltage, circulating gas flow, circulation background gas and other process parameters and the effects of the different catalyst composition on toluene degradation, and addition of catalyst was analyzed on the degree of degradation, the influence law of O3 and N2 O, provided a theoretical basis and design basis for industrial application.Paper main conclusions are as follows:(1) the research of toluene degradation with non-thermal plasma showed that COx yield and CO2 selective decreased with the increase of adsorption storage capacity, but COx production increased;With the increase of applied voltage and cyclic gas flow, COx yield and CO2 selectivity were increased;When the O2 was circulation background gas COx yield and CO2 selectivity were increased in comparison to air.(2) the research of toluene degradation with catalytic combined with non-thermal plasma circulation-degradation system showed that the addition of catalyst can significantly improve the COx yield and CO2 selectivity and with oxygen being gas circulation background, increased more.In the same conditions, different catalyst composition corresponding COx yield sequence is: Ce>Mn>Ag>Co, corresponding to the CO2 selectivity sequence is:Ag>Mn>Co>Ce.Two-component complex metal oxide catalysts Ce/Ag、Mn/Ag can effectively improve COx yield and CO2 selectivity at the same time.(3) FT-IR spectrum analysis of adsorbed toluene degradation products showed that the main product were CO2, H2 O and small amounts of CO,and by-products mainly was O3;Product remained infinitesimal amounts of toluene without catalyst,and the addition of catalyst can make all toluene removed,reducing the emissions of CO and O3;It was be formation of N2 O with air circulation background gas.(4) the air for gas circulation background, the addition of catalyst inhibited the formation of N2O(except Ce) with air circulation background gas, the corresponding N2 O inhibition performance being: Co>Mn>Ag>no catalyst>Ce;Three components of composite catalyst Ce/Ag/Co、Mn/Ag/Co can improve COx yield and CO2 selectivity at the same time effectively inhibit N2 O.The addition of catalyst can reduce O3 and the ability in improving toluene degradation effect of catalyst had no correlation with the ability in reducing O3.