Phase structure of V₂O₅/TiO₂ catalyst and catalytic behavior with removal of NO by ammonia

V₂O₅/TiO₂ catalyst with 3% (w/w) V loading has been prepared by sol-gel method. The characterization results of the catalyst structure and catalytic activity show that VO _X state is strongly dependent on the calcination temperature. Little effect is found for phase structure of TiO₂ support on catalytic activity. High catalytic activity in wide temperature range (240-420 °C) is observed for the catalysts calcinated at different temperatures at a space velocity of 50,000 h^-1. Space velocity and alkali metal oxides strongly influence the catalytic activity of the catalyst which was calcinated at 450 °C, furthermore, the one has high tolerance to SO₂ in our test conditions.