摘要：Vanadia and tungsten oxide supported on Ti〇2 (VWTi) catalysts with various Ti〇2 carriers or calcination temperature and atmosphere were prepared to remove 1,2-dichlorobenzene (1,2-DCBz) between 150 and 300 °C. The elemental analysis and structural parameters of synthesized catalysts were characterized using EDS, SEM, XRD and N2 physisorption. The results showed higher removal efficiency (RE) could be achieved from nano-scale Ti〇2 carriers (<5 nm) with larger specific surface area and smaller pore size. However, the increased calcination temperature (above 450 °C) decreased RE by causing the collapse of micropore structure, resulting in agglomeration of the particle at higher calcination temperature. To the best of our knowledge, this is the first attempt to optimize the catalytic activity for 1,2-DCBz oxidation under different calcination atmosphere (air, O2, 〇2+100 ppm O3). The surface chemical properties were analyzed by XPS. The transformation of V4+ to V5+ and the concentration of surface chemisorbed oxygen had been highly promoted with the increase of O2 content in calcination atmosphere. The addition of O3 further improved the transformation of V3+ to V4+, both increased the average vanadium oxidate state and catalytic properties.
