Low temperature selective catalytic reduction of NO by NH3 over V2O5 supported on TiO2–SiO2–MoO3

Abstract

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.

Catalysts for the selective catalytic reduction of NOx with NH3 at low temperature

“…6,75,76 The catalytic performance was further promoted by loading V2O5 on a TiO2-SiO2-MoO3 support using co-precipitation method. 77 This catalyst exhibited a superior SCR activity and a good sulfur tolerance at lower temperature. Such superior lowtemperature SCR activity was mainly attributed to the presence of polymeric vanadate species and high redox property besides high surface area.…”

Relationship between the molecular structure of V2O5/TiO2 catalysts and the reactivity of SO2 oxidation

“…6 Choo et al found that BaO on a V 2 O 5 /TiO 2 catalyst significantly suppresses SO 2 oxidation by reducing the redox ability of vanadium oxide on the catalyst surface and the adsorption capacity of SO 2 . [8][9][10] A few fundamental studies have been performed on the mechanism of SO 2 oxidation over V 2 O 5 /TiO 2 based catalysts. [8][9][10] A few fundamental studies have been performed on the mechanism of SO 2 oxidation over V 2 O 5 /TiO 2 based catalysts.…”

The characterization and activity of F-doped vanadia/titania for the selective catalytic reduction of NO with NH3 at low temperatures

“…Recently, efforts have been made to promote low-temperature SCR performance of vanadia catalysts through the use of promoters such as 1%CrO 3 -6%V 2 O 5 /TiO 2 [3] and 1%MO x (M = Fe, Mn, Cu or Cr)-3%V 2 O 5 /mesoporous carbon-coated monoliths [6]. Other approaches have changed the support to materials such as 3-8%V 2 O 5 /carbon-coated monoliths [7][8][9] [13], 3-7%VO x (x < 2.5)/TiO 2 (supports obtained from different companies) [14]. However, these catalysts were unable to reduce the vanadia loading.…”