Selective Catalytic Reduction of NO_x on High Concentration of Vanadium Catalyst at Middle-Low Temperature

摘要

A series of high concentration of vanadium catalysts were prepared by the citric acid method and was evaluated for the selective catalytic reduction of NO_x by ammonia (NH_3-SCR) at middle-low temperature (180-280°C). Experimental results showed that V-W/SiTiO_x exhibited the good activity on NH_3-SCR reactions, N_2 selectivity and SO_2 durability over a broad temperature range of 180-280°C with the high space velocity. Above 90% conversion of NO_x with 100% selectivity of N_2 had been achieved on V_5W_8SiTi at 220-240°C with the space velocity of 36,000 h~(-1). X-ray diffraction, BET were adopted for the characterization of the active phase. The high activity of the VW/SiTi mixed oxide catalyst could be main be reason for the strong interaction between V and W.