Role of WO3 in mixed V2O5-WO3/TiO2catalysts for selective catalytic reduction of nitric oxide with ammonia

Effect of the origin of TiO2 on the properties of honeycomb monolith V-W-Ti-O catalysts for selective no reduction by ammonia

“…WO3 and Nb205 additives to V-Ti-O catalysts were experimentally eonftrmed to stabilize the thermal stability and activity of these catalysts under their working conditions in gas media containing traces of sulfur compounds [9]. This agrees with Res [6,10].…”

“…2, the optimum V-W-Ti-O catalyst content is 1.5 wt.% VzO5 and 3 wt.% WO3. Use of K2WO4 as the initial W-contakting compound causes a sharp impairment of the catalytic properties, which is l~ely to be associated with the poisoning of active sites by the alkaline metal oxide [6]. At 225~ the support titania itself exhibits an insignificant activity in selective NO reduction by ammonia (Fig.…”

A comprehensive review on selective catalytic reduction catalysts for NOx emission abatement from municipal solid waste incinerators

“…Chen et al . indicated that the introduction of HCl led to a sharp decrease in NO conversion. The NO conversion dropped from 98 to 22% in 30 min, and continued to decrease as a function of time .…”

“…Commercial SCR catalysts consist of TiO 2 and V 2 O 5 ‐WO 3 , with a high surface area support and active catalyst compounds. WO 3 increased the number of acid sites and stabilizes the Brønsted acidity of catalyst . Furthermore, WO 3 increased the resistance of catalyst to chemical deactivation by alkali metal oxides and reduced ammonia oxidation as well as SO 2 oxidation to SO 3 .…”

Hybrid selective noncatalytic reduction (SNCR)/selective catalytic reduction (SCR) for NOx removal using low-temperature SCR with Mn-V2O5/TiO2 catalyst

“…This is because V 2 O 5 /TiO 2 achieves active reduction of NO generated from a fixed source by using NH 3 as the reducing agent. Also, V 2 O 5 /TiO 2 has superior endurance against SO 2 compared with other catalysts (Chen and Yang, 1992). For formulation of a practical V 2 O 5 /TiO 2 catalyst, WO 3 (Choo et al, 2003), MoO 3 (Lietti et al, 1999), SiO 2 (Sorrentino et al, 2001), or other chemicals is added or sulfated according to the processing condition.…”