Effect Of 13X Zeolites Loading Mn-Ag On Degradation Of Adsorbed Toluene By Non-thermal Plasma

Volatile organic compounds(VOCs) is toxic and carcinogenic, due to volatile, it will cause serious harm to the environment and human health. VOCs are widely exist in the production of chemical raw materials and printing, spraying and other industries, having the characteristics of low concentration of organic waste gas can use non-thermal plasma technology to degrade it. Non-thermal plasma technology combined with catalysts which have adsorption properties make process short and efficiency. Catalysts play an important role in non-thermal plasma technology; it not only improves the selectivity of CO2, but also improves the decomposition of O3. But how to optimize the catalyst activity is needed to be further investigated.In experiment, Mn-Ag acted as activity and 13 X zeolites acted as carrier in catalysts. A series of Mn-Ag/13 X catalysts prepared in different methods, loading sequence, molar rate, total amount and calcinations temperature, were investigated in absorption of toluene, degradation of absorbed toluene and generation byproducts of O3 and N2 O in non-thermal plasma technology. The catalysts were characterized by scanning electron microscope(SEM), Brunauer-emmett teller(BET) and X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS). Main conclusions are as follows:(1) Catalysts were prepared in incipient-wetness impregnation method and deposition-precipitation method. It was showed that incipient-wetness impregnation method loaded most Mn-Ag than deposition-precipitation method in fact, under the same theorist loading. Mn-Ag-IM/13 X had short adsorption breaking time of toluene. But it had high COX concentration and selective of CO2, and emission of O3 and N2 O were less in non-thermal plasma reactor decomposition of absorbed toluene. Using incipient-wetness impregnation method load Mn-Ag to study following investigations.(2) Catalysts were prepared in different load sequence, some activity were covered so that the main activity were different in catalysts surfaces. MnF-Ag/13 X had longest adsorption breaking time of toluene about 125 min, COX concentration and selective of CO2 were highest in non-thermal plasma reactor degradation of toluene. Using load manganese first then load silver method to study following investigations.(3) Catalysts were prepared in different molar rate and total amount. Mn-Ag/13X(1:3) had highest COX concentration and selective of CO2, in this molar rate, 5%Mn-Ag/13 X had longer adsorption breaking time of toluene and highest COX concentration and selective of CO2 in non-thermal plasma reactor degradation of absorbed toluene. Mn: Ag = 1:3, 5% total amount was the optimal load, use it to study next investigation.(4) Catalysts were prepared in different calcination temperature. Mn-Ag/13X(500℃) had longer adsorption breaking time of toluene. While it had most lattice oxygen, so COX concentration was highest, CO2 selectivity was higher, byproducts of O3 and N2 O emitted less in non-thermal plasma reactor degradation of absorbed toluene. 500℃ was the desirable calcination temperature of Mn-Ag/13 X catalysts.