HC-adsorbent for internal combustion engine

Details HC-adsorbent for internal combustion engine HC-adsorbent for internal combustion engine

2006-06-20

2006-06-20

Tran, Hien (Department: 1764)

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Waste gas purifier

C422S171000, C502S060000, C502S064000, C502S067000

Reexamination Certificate

active

07063818

ABSTRACT:
An internal combustion engine HC-adsorbent is located in one of a pair of exhaust passages in parallel to each other downstream of an emission control catalyst for purifying an exhaust gas and through which exhaust gas flows selectively by a switchover valve. The adsorbent is a zeolite mixture having pores at least 3.5 Å and smaller than 6 Å and not equal or larger than 6 Å and smaller than 7 Å, and zeolite having pores at least 7 Å and smaller than 10 Å and not equal or larger than 6 Å and smaller than 7 Å. HCs are desorbed quickly and easily lowering the desorption temperature, while ensuring excellent adsorbing performance for HCs of different molecular diameters. Even when a vehicle travels only a short duration after engine starting, desorption advances quickly and reliably, the adsorbent exhibiting intended adsorbing performance at the next engine starting.

REFERENCES:
patent: 5417947 (1995-05-01), Hertl et al.
patent: 5958818 (1999-09-01), Demmel et al.
patent: 6354076 (2002-03-01), Yasui et al.
patent: 2000087733 (2000-03-01), None

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