| 摘要 |
In an exhaust gas purifier (10) including an NOx catalyst (12) of the selective reduction type and a DPF (14), which are arranged in series, and being disposed in an exhaust passage (2) of an internal combustion engine, provided are: a passage for urea supply (16) having a hydrolysis catalyst (15) deposited therein and a passage for HC supply (18) having an oxidation catalyst (17) deposited therein, the passages (16) and (18) being disposed in parallel to each other on the upstream side of both the NOx catalyst (12) of the selective reduction type and the DPF (14); a urea feeder (20) which supplies urea to the passage for urea supply (16); and an HC feeder (21) which supplies HCs to the passage for HC supply (18). By this, the system for exhaust gas purification (1), which employs both the NOx catalyst (12) of the selective reduction type and the DPF (14), reconciles the injection of an ammonia solution with the direction injection of HCs into the exhaust pipe in a compact space. |
