Promotional roles of ZrO2 and WO3 in V2O5-WO3/TiO2-ZrO2 catalysts for NOx reduction by NH3: Catalytic performance, morphology, and reaction mechanism

WO3 and ZrO2 facilitated dispersion of all metal oxides on catalysts. The addition of WO3 or ZrO2 led to different pathways for NOx reduction, involving either [NH4+-NO-Brönsted acid site]* and [NH2-NO-Lewis acid site]* intermediates.