Catalytic conversion of 1,2-dichlorobenzene over mesoporous V ₂O ₅/TiO ₂ prepared from spray pyrolysis

Mesoporous V ₂O ₅/TiO ₂ particles were prepared by spray pyrolysis and applied to the catalytic oxidation of 1,2-dichlorobenzene (1,2-DCB). Two different precursors (alkoxide and nanoparticles) for the TiO ₂ support were used to determine the effects on the texture properties and the catalytic activity of the mesoporous V ₂O ₅/TiO ₂ particles. The 5 wt% V ₂O ₅/TiO ₂ particles had the largest surface area (173 m2/g) and 4.7 nm in average pore size. The catalytic activity of the V ₂O ₅/TiO ₂ particles depended strongly on the loading quantity of vanadium, whereas the P25-derived samples showed no significant change in catalytic activity with weight% of vanadium. The surface area of the V ₂O ₅/TiO ₂ particles prepared using the alkoxide precursor was larger than that of the particles prepared using P25 nanoparticles. The P25-derived V ₂O ₅/TiO ₂ particles, however, showed a higher catalytic activity compared with those alkoxide-derived, which is due to the difference in the vanadium quantity exposed to the pore surface. It was confirmed that the 10 wt% V ₂O ₅/TiO ₂ particles prepared by spray pyrolysis had an excellent activity for the oxidation of 1,2-DCB, particularly at temperatures below 300 deg;C.