| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device of an internal combustion engine capable of promoting sulfur poisoning recovery processing of an exhaust emission control catalyst while restraining an excessive temperature rise in the exhaust emission control catalyst temperature when performing the sulfur poisoning recovery processing in the exhaust emission control device having the exhaust emission control catalyst requiring the sulfur poisoning recovery processing. <P>SOLUTION: This exhaust emission control device of the internal combustion engine has a hydrocarbon-based fuel adding means for adding hydrocarbon-based fuel in exhaust gas on the upstream side of the exhaust emission control catalyst, and an H<SB>2</SB>O adding means for adding H<SB>2</SB>O in the exhaust gas on the upstream side of the exhaust emission control catalyst, and is characterized by supplying the hydrocarbon-based fuel and H<SB>2</SB>O in the exhaust gas on the upstream side of the exhaust emission control catalyst by the hydrocarbon-based fuel adding means and the H<SB>2</SB>O adding means for lowering the temperature of the exhaust emission control catalyst by steam refining reaction when the temperature of the exhaust emission control catalyst exceeds the predetermined temperature when performing the sulfur positioning recovery processing of the exhaust emission control catalyst. <P>COPYRIGHT: (C)2007,JPO&INPIT |
