V-W/Ti Catalysts For Purification Of Chlorinated Volatile Organic Compounds

As the more attention to the Chlorinated Volatile Organic Compounds (CVOCs), the methods of dealing with CVOCs had the well developed. Among the various disposal methods, catalytic combustion has advantages of low temperature operation, low costs and no by-products which became an important method. The V-W/Ti system became the hotspot because of higher activity of vanadium and tungsten.In this paper, catalytic combustion of 1,2-dichloroethane is a model reaction. Researching of TiO2 support on catalytic activity and then comparing with them. Compared with V, W impregnating order and atomic ratio of V/W to investigate on 1,2-dichloroethane catalytic performance. Characterization of BET, XRD, TPR, and FTIR to research the surface area, crystalline, oxidation ability and acid of catalysts. The Raman spectra to explain catalytic stability for the decline.The research shows that performance of 500℃for TiO2 prepared of catalyst is better than that 700℃for TiO2. This can be attributed to the former has higher content of anatase crystal type, which has higher chemical activity. In different impregnating order prepared of the samples, the simultaneous impregnation has amount of medium-strong B acid and strong oxidation, the catalytic activity is obviously. During the evaluation of catalytic activity with different V/W atomic ratio, atomic ratio of 3 with a large amount of B acid, however, the V in partial with V2O5. Furthermore, the oxidation is week which leads to worst activity. Atomic ratio of 1 is better than other two in acid strength and oxidation which has better performance on activity. Based on the experiment results to study preliminarily on the reaction mechanism of 1,2-dichloriethane. In the experiment of stability, carbon deposition (W-V/Ti) and crystal transformation (V3W1) are lead to a decline in stability.