Catalytic performance of silver- and indium-supported TiO2ZrO2 binary oxide for the selective reduction of nitrogen monoxide with propene

The catalytic activity of silver- and indium-supported TiO2ZrO2 binary oxide for NO reduction by propene in the presence of oxygen was investigated. Silver and indium enhanced drastically the NO reduction activity of TiO2ZrO2. This metal additive effect was considered to be due to the promotion of the reaction of NO2 with propene leading to the formation of N2 via organic compounds containing oxygen and nitrogen. In fact, in-situ FT-IR measurements suggested that silver on TiO2ZrO2 catalyzes effectively the reaction of adsorbed species to form an isocyanate species which is a possible reaction intermediate in this reaction.