The V 2 O 5 catalysts supported on TiO 2 -SiO 2 -MoO 3 (TSM) prepared by the coprecipitation method were investigated for the selective catalytic reduction (SCR) of NO by NH 3 at low temperatures. The V 2 O 5 /TSM catalyst with 7-13 wt% SiO 2 was found to exhibit a superior SCR activity and a good sulfur tolerance at low temperatures (<250°C). The presence of highly active polymeric vanadates formed by the incorporation of MoO 3 to TiO 2 -SiO 2 and superior redox properties seems to enhance SCR activity, and furthermore the very lower SO 2 oxidation activity due to the higher acidity leads to the remarkable improvement of sulfur tolerance.
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