| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust emission control device which can restrain deterioration of catalyst due to poisoning of NOx and due to heating, which is small-sized, and which can remove both PM and NOx simultaneously. SOLUTION: This exhaust emission control device, incorporated in an exhaust system of a combustion engine, includes a wall-flow type filter 1. The wall surface 3 of the filter 1 is coated thereover an NOx reduction catalyst layer 5 formed of NOx reduction catalyst on the engine side, and the NOx reduction catalyst layer 5 is coated thereover with an oxidizing catalyst layer 7 formed of an oxidizing catalyst, on the engine side. |
