Study On Combination Of Metallic Oxide Supported On Activated Carbon And Plasma To Degradation Of Toluene

The BTEX in the air impacts on people’s lives and health seriously, and degradation ofthese pollutants is difficult because of their high stability. Using plasma to degradate thesepollutants in the air is more active study in recent years. However,using plasma to degradatethe organic pollutants requires a large amount of energy, and generates much the toxicbyproduct. The plasma combination catalytic to remove volatile organic contaminants havebeen studied in recent years, which to expect to achieve low power consumption, highefficiency, no harmful byproducts.This study plasma combined with metal oxide supported on activated carbon catalyst toremove toluene which is used to examine catalyst activity of FeOx, MnOx, TiO2catalyst. Theimpact factors of catalyst activity of the highest catalyst were studied, and also study theimpact on the highest actived catalyst. Various catalysts were characterized.The main research results are as follows:(1) When the voltage does not reach the corona onset voltage, the degradation rate of thetoluence is substantially0. When the corona onset voltage is exceeded, the toluenedegradation rate increases as the voltage increases.When the voltage increases to a certainextent, the degradation rate of growth becomes too slow. This is too large due to the voltagearcing phenomena. When the reaction gas flow rate is decreased, the plasma degradation oftoluene removal efficiency increases, but the plasma unit power of toluene degradation ratedecreased. The NOx concentration increases with the plasma discharge voltage. While thevoltage is low, the concentration of NO is greater than the concentration of NO2.(2) Removal capacity of toluene and O3removal rate in descending order are: Mn3O4>using Fe2O3> TiO2> without catalyst. the degradation ability of NOx are Fe2O3> Mn3O4> TiO2> without catalyst. From XRD characterization patterns shows the oxide of manganesenitrate is Mn3O4and the iron nitrate is Fe2O3after350℃calcination. oxygen-containinggroups of Mn3O4load on the activated carbon is increased after the reaction2h.Boehmtitration shows the activated carbon has a high content of surface groups,and the metal oxideload on activated carbon containing groups on the surface is greatly reduced, especiallyphenolic hydroxyl group.(3) MnOx can reduce the concentration of the byproducts effectively, and the optimalvalue of load amount is9%.The catalyst after calcined at350℃with the highest activity. Themain decomposition products of manganese nitrate is Mn2O3after Calcination at250℃,Mn3O4after Calcination at350℃,and MnO after Calcination at450℃.(4) The main mechanism of combining plasma with metal oxide load on activated carbonto degradate of toluene: the primary particles of the main reaction in the plasma reaction zoneis the high-energy electrons and a variety of radicals;active oxygen and ozone in the catalyticreaction zone.