High performance of catalytic sheet filters of V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> for NO<sub>x</sub> reduction

Abstract

Nitrogen oxide (NOx) emissions in fuel from the stationary as well as from mobile sources primarily from power stations, industrial heaters, cogeneration plants, and diesel engines represent a major worldwide environmental problem. The selective catalytic reduction (SCR) of NO(x)with NH(3)over catalyst based on V2O5-WO3/TiO2(VWT) is the most effective benchmark technique to efficiently reduce NO(x)emissions from stationary and mobile sources. Among the different transition metals (Mn, Nb, Co, Cr, Cu, Ce) used in current research work, the manganese could make up the loss of SCR activity caused by the decrease of V(2)O(5)loading (50%) in prepared VWT powder catalyst. The optimal loading of Mn is 3 wt% in case of 3V9WT powder catalyst, which shows the best catalytic performance. 3Mn3V9WT powder catalyst exhibits enhanced NO conversion performance, i.e., similar to 95-98% with NH(3)leakage < 20 ppm, for the temperature window of 260-320 degrees C in comparison with all other metal-doped 3V9WT catalyst powder. Manganese is the best substitute (50%) to vanadium in VWT catalyst without compromising the NO conversion performance even in presence of SO2(1000 ppm), i.e., > 94% for the temperature of 300-320 degrees C. The recovery of SCR activity of the 3Mn3V9WT catalyst after SO(2)effect was good, i.e., similar to 94% at 320 degrees C for long interval of time, where NH(3)leakage was < 5 ppm.