Catalysis Letters, Vol.112, No.3-4, 133-138, 2006
Role of tungsten in promoting selective reduction of NO with CO over Ir/WO3-SiO2 catalysts
The catalytic activity for the selective reduction of NO with CO over Ir/SiO2 was greatly increased by the addition of a W species. The active site for reduction of NO over Ir/WO3-SiO2 was an Ir-WOx species (2.92 <= x <= 3). The role of the Ir-WOx active site was to promote the NO dissociation step.