| abstract |
The exhaust purification material according to the present invention includes a filter (10), which is a particulate filter (10) for trapping particulate matter in exhaust gas, and includes an SCR catalyst that absorbs ammonia and reduces NOx in exhaust gas . The allowable maximum adsorption amount of ammonia that can be adsorbed by the filter (10) is between the upstream side part (10a) of the filter (10) including the end part (10c) on the exhaust gas inlet side and the end part (10a) including the exhaust gas outlet side ( The downstream side part (10b) of 10d) is different. The maximum allowable adsorption amount A of ammonia in the upstream portion (10a) is smaller than the maximum allowable adsorption amount B of ammonia in the downstream portion (10b) (A<B). |