EXHAUST EMISSION CONTROL METHOD AND DEVICE FOR INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To provide a technique which can prevent sulfur components contained in added reducer from flowing into an NOx catalyst so as to maintain a high NOx cleanup rate.

SOLUTION: By providing an S trap catalyst 11 which entraps sulfur components contained in exhaust gas discharged from an internal combustion engine 1 and an S trap catalyst 12 which entraps the sulfur components contained in the reducer added in the exhaust gas the sulfur components of which have been entrapped by the S trap catalyst 11, the sulfur poisoning of the NOx catalyst 14 can be surely prevented.

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