Enhanced chlorobenzene oxidation over V–TiO2 catalysts through enhancing V2O5–TiO2 interaction

To develop efficient catalysts for chlorinated VOC combustion with enhanced chlorine resistance, V–TiO 2 solid-solution catalysts were prepared via the sol–gel (SG) method and evaluated for chlorobenzene oxidation. In contrast to those synthesized by hydrothermal (HT) and impregnation (IM) methods, the SG-derived V–TiO 2 formed a solid solution with abundant V–O–Ti bonds and V 2 O 5 –TiO 2 interfaces. The TiO 2 acts as an electron donor to V 5+ , promoting oxygen vacancy formation, which facilitates oxygen adsorption and activation. As the amount of incorporated vanadium increases, the activity of the V–TiO 2 catalyst exhibits a volcanic pattern, indicating that constructing an appropriate amount of V 2 O 5 –TiO 2 interface is the key to improving the low-temperature activity of the V–TiO 2 catalyst. The SG-prepared V 2 O 5 /TiO 2 achieved 90% chlorobenzene conversion at 250 °C (GHSV   =   22,500  h −1 , C   =   1000  ppm), which is significantly lower than previously reported V 2 O 5 /TiO 2 catalysts. There were only a few kinds of byproducts and no chloride organic byproducts were generated. The catalyst also exhibited excellent stability and water resistance. This work offers an effective strategy for designing stable catalysts for chlorinated VOC combustion.