| 摘要 |
PROBLEM TO BE SOLVED: To provide a catalyst, a method and a system for processing the exhaust flow of a diesel engine, a lean burn gasoline engine, etc.SOLUTION: The catalyst includes a first catalyst including platinum supported on a metal oxide having light resistance, and a second catalyst including a metal selected from copper and iron supported on an ion exchange site of zeolite having a CHA structure. The catalyst has an effect for removing ammonia by oxidation even at a temperature lower than about 300°C, without substantial reduction in the efficiency of oxidation of ammonia due to hydrothermal curing. In an aspect of the method, the exhaust flow of a vehicle engine is allowed to pass through a catalyst for reducing NO, and the ammonia-containing exhaust flow from the catalyst for reducing NOis allowed to pass through the ammonia oxidation catalyst. |
