| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device preventing increase in amount of carbon monoxide and leakage of reducing agent, when a NOx occlusion reduction catalyst is recovered from a state poisoned with sulfur. <P>SOLUTION: The exhaust emission control device has the NOx occlusion reduction catalyst 13 provided halfway in an exhaust pipe 11 in which exhaust gas 9 flows from an engine 1, and a fuel adding means 15 disposed upstream of the NOx occlusion reduction catalyst 13 so as to add fuel in the exhaust gas 9. The exhaust emission control device recovers the NOx occlusion reduction catalyst 13 by adding the reducing agent when the NOx occlusion reduction catalyst 13 is poisoned with sulfur, and has an oxygen supply means supplying oxygen to the downstream of the NOx occlusion reduction catalyst 13. <P>COPYRIGHT: (C)2008,JPO&INPIT |
