| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust treatment device of simple and low-cost structure capable of properly controlling the supply quantity of a reducing agent in response to the exhaust quantity of NOx, satisfying a request for OBD, in regard to an exhaust treatment device in which a selective reduction type catalyst for reducing NOx in the exhaust for exhaust emission control by supplying a reduction agent to the exhaust is arranged and an exhaust emission control catalyst for treating residual reducing agent is arranged on a downstream side of the exhaust. <P>SOLUTION: This exhaust treatment device comprises a urea water adding device 4, a urea SCR catalyst 5 and an ammoxydation catalyst 6. An ammonia sensor 9 is arranged between the urea SCR catalyst 5 and the ammoxydation catalyst 6, and a NOx sensor 8 is arranged on an exhaust downstream side of the ammoxydation catalyst 6. <P>COPYRIGHT: (C)2009,JPO&INPIT |
