| abstract |
An exhaust gas purification device comprises a plurality of branch exhaust passages (2, 3), a converging exhaust passage (110), a shut-off valve (4) for performing changing-over between the inflow and the shut-off of exhaust gas into the branch exhaust passages (2, 3), a nitrogen oxide adsorbing member (5) for temporarily adsorbing nitrogen oxides in an excess air atmosphere, desorbing the adsorbed nitrogen oxides in a reduction atmosphere, and reducing the nitrogen oxides in the reduction atmosphere to produce ammonia, a first combustor (6) which is disposed further nearer to the exhaust upstream side than the nitrogen oxide adsorbent (5), and which includes an air supply means and converts the air supplied from the air supply means into the reduction atmosphere, and a selective reduction catalyst (19) which is provided in the converging exhaust passage (110) and selectively reduces the nitrogen oxides with use of ammonia as a reducing agent. |