| 摘要 |
According to the present invention, at least one reducing agent selected to the group consisting of oxygenated hydrocarbons, carbohydrate, and a mixture thereof, which include carbon number of three or more and at least one of hydroxyl group, ether group, aldehyde group and ketone group contained in one molecule or carbon number of two or more and at least one of hydroxyl group, ether group, aldehyde group and ketone group contained in one molecule, is injected on at least one injection position in a moving path of exhaust gas including nitrogen dioxide. According to the present invention, a removal rate of nitrogen dioxide to an injected amount of reducing agent is increased or an amount of by-products is reduced so that nitrogen dioxide can be effectively reduced at a low driving cost. |
