Exhaust gas control apparatus for internal combustion engine

Details Exhaust gas control apparatus for internal combustion engine Exhaust gas control apparatus for internal combustion engine

2007-12-11

2007-12-11

Tran, Binh Q. (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

C060S274000, C060S285000, C060S297000

Reexamination Certificate

active

10573702

ABSTRACT:
A converter (70) which houses a NOx storage/reduction catalyst is provided in an exhaust passage (2) of an engine (1). At a front half portion (inlet side portion) (7a) of a carrier of the NOx storage/reduction catalyst in the converter (70), the amount of an oxygen storage component is made less than it is at a rear half portion (outlet side portion) (7b) of the carrier, and a NOx storage capacity is made larger than it is at the rear half portion (7b) of the carrier. As a result, unpurified NOx released from the front half portion (7a) of the carrier at the beginning of a rich spike due to an02storage operation is able to be stored in the rear half portion (7b) of the carrier, and so is not exhausted outside the catalyst Moreover, the amount of HC and CO components in the exhaust gas that are needlessly consumed by the02storage operation without being used to purify NOx is reduced, making it possible to purify NOx efficiently.

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