| 摘要 |
The invention discloses a denitration catalyst composition to efficiently and reductively remove nitrogen oxides from exhaust gas of a boiler or an internal combustion engine operated in lean-combustion, such as a gasoline engine, a diesel engine, by carbon monoxide and hydrocarbons; and a denitration method using the same. A denitration catalyst composition, characterized in that a precious metal element (C) having rhodium (Rh) as an essential component is supported on a zirconium oxide-based carrier (A) formed by condensing or mixing primary particles having a zirconium oxide as a main component, and further a cerium-containing oxide (B) is present at the surface of the zirconium oxide-based carrier (A) and at the gap of the secondary particles; and a denitration method characterized in that exhaust gas containing NO (nitrogen oxides), CO (carbon monoxide) and O 2 (oxygen) is contacted with the denitration catalyst composition according to any one of claims 1 to 10, under oxidative atmosphere having an air/fuel ratio (A/F) of 14.7 or higher, at a temperature range of 400 to 800°C or the like. |
