Exhaust gas purification system for an internal combustion engin

Details Exhaust gas purification system for an internal combustion engin Exhaust gas purification system for an internal combustion engin

1990-12-04

1994-07-26

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

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

60289, 60298, F01N 328

Patent

active

053318099

ABSTRACT:
An exhaust gas purification system for an internal combustion engine includes a catalyst installed in an exhaust conduit of an engine and constructed of zeolite carrying at least one kind of metal selected from transition metals and noble metals to reduce nitrogen oxides included in the exhaust gas from the engine under an oxidizing gas condition and in the presence of hydrocarbons. The system further includes means for repeating a cycle of cooling the catalyst and then stopping the cooling to allow the catalyst to rise in temperature so that the temperature rising courses of the catalyst are positively and repeatedly produced. Since the catalyst can show a higher nitrogen oxides reducing ability in the temperature rising course than in the temperature lowering course, the NOx purification rate is greatly improved due to the positive production of the temperature rising courses.

REFERENCES:
patent: 3181928 (1965-05-01), Frilette
patent: 3282046 (1966-11-01), Walker
patent: 4315895 (1982-02-01), Bramer
patent: 4331644 (1983-05-01), Ritscher
patent: 4394351 (1983-07-01), Gast
patent: 4404795 (1983-09-01), Oishi et al.
patent: 4438627 (1984-03-01), Gotoh
patent: 4583363 (1986-04-01), Urushidani et al.
patent: 5125231 (1992-06-01), Patil

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