Catalytic performance of indium-supported TiO_2-ZrO_2 for the selective reduction of nitrogen monoxide in the presence of oxygen

摘要

The catalytic activity of indium-supported TiO_2-ZrO_2 binary metal oxide for the selective reduction of NO with propene in the presence of oxygen was investigated. The supported indium caused a drastic enhancement of NO reduction activity of TiO_2- ZrO_2. It was suggested that the "dispersed phase" of indium oxide, which is reduced at lower temperature in temperature-pro- Grammed reduction (TPR), is responsible for the high activity. Propene served as the most efficient reducing agent, while oxyge- Nated hydrocarbons were not good ones. A reaction mechanism was proposed that N_2 is formed through the reaction of propene And NO_2, which was formed on the acid sites of TiO_2-ZrO_2 on the indium sites.