NO-NH3-O2 reaction catalyzed by V2O5/AC at low temperatures: effects of SO2, V2O5 loading and reaction temperature

Abstract

The effects of SO 2 , V2O5 loading and reaction temperature on the activity of activated carbon supported vanadium oxide catalyst have been studied for the reduction of NO with NH 3 at low temperatures (150- 250 ). It is found that SO 2 significantly promotes the catalyst activity. Both V 2 O 5 loading and reaction temperature are vital to the promoting effect of SO 2 . The catalysts with V 2 O 5 loadings of 1- 5 weight percent have a positive effect on the promotion of SO 2 , while the catalysts with V 2 O 5 loadings of above 7 weight percent have not such an effect or show a negative effect. At lower temperatures ( 2 poisons the catalyst but at higher temperatures promotes it. The reason of the SO 2 promotion was also discussed; it may results from the formation of SO 4 2- on the catalyst surface, which increases the surface acidity and hence the catalytic activity.