Exhaust gas purifying system for internal combustion engine

Details Exhaust gas purifying system for internal combustion engine Exhaust gas purifying system for internal combustion engine

1998-09-03

2000-09-05

Denion, Thomas

Power plants

Internal combustion engine with treatment or handling of...

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

60300, 60299, 60297, 60286, 422177, F01N 310

Patent

active

061125202

ABSTRACT:
In an exhaust system of the internal combustion engine, there are provided, in this order from upstream, a three-way catalyst, an adsorbent-catalyst containing at least zeolite in its composition and capable of absorbing hydrocarbons, an electrically heated catalyst containing at least platinum in its composition, and a catalyst containing at least palladium in its composition. The electrically heated catalyst can effectively purify low boiling-point HC of paraffinic hydrocarbon which has been desorbed from the adsorbent-catalyst after about 20 seconds from the start of the engine. On the other hand, the catalyst can effectively purify high boiling-point HC of aromatic hydrocarbon which has been desorbed from the adsorbent-catalyst after about 80 seconds from the start of the engine. When the catalyst is an electrically heated catalyst, it is energized after the energization of the other electrically heated catalyst is ended and the supply of electric power can hence be minimized.

REFERENCES:
patent: 5146743 (1992-09-01), Maus et al.
patent: 5538697 (1996-07-01), Abe et al.
patent: 5802845 (1998-09-01), Abe et al.
patent: 5887422 (1999-03-01), Abe et al.
patent: 5941068 (1999-08-01), Brown et al.

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