Catalityc removal of nitrogen oxide from combustion gases

Nitrogen oxide conversion to nitrogen over Pt/Al₂ O₃, Pd/Al₂O₃, Rh/Al₂O₃ catalysts was investigated. The results of the catalytic activity investigations, with the iso-x method, showed that NO reduction by methane occurs at a reasonable rate at the temperature range 200-500°C. Alumina-supported Pd, Pt and Rh catalysts have been compared for the selective reduction of NO to N₂. All the catalysts showed good activity in NO reduction by methane, giving around 80 - 90% N₂ production. At moderate temperatures Pt is the most active catalyst for the removal of NO.