Selective catalytic reduction (SCR) of NO by NH3 over TiO2-supported V2O5–WO3 and V2O5–MoO3 catalysts

A comparison between commercial and model WO3–V2O5/TiO2 and MoO3–V2O5/TiO2 SCR catalysts is considered in this study. The data indicate that WO3 and MoO3 behave as “structural” and “chemical” promoters for the catalysts. MoO3-based catalysts are more active but less selective than WO3–V2O5/TiO2 catalysts in the SCR reaction, although in the presence of water the catalytic performances of the investigated samples are comparable.