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

1992-01-31

1993-04-13

Lazarus, Ira S.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 60285, 60287, 60298, 60300, 60301, F01N 320

Patent

active

052018024

ABSTRACT:
An exhaust gas purification system for an internal combustion engine includes an engine capable of fuel combustion at lean air-fuel ratios, a catalyst constructed of zeolite carrying at least one metal selected from the transition metals and noble metals to reduce NOx under oxidizing gas conditions and in the presence of HC. The exhaust gas purification system also includes a device for determining degradation of the catalyst, and a device for increasing the amount of HC or changing a catalyst temperature to a higher side when it is determined that the catalyst has been degraded. The NOx purification rate of the catalyst is maintained high even after the catalyst has been degraded.

REFERENCES:
patent: 3882451 (1975-05-01), Fujishiro et al.
patent: 4079714 (1978-03-01), Saito
patent: 4729220 (1988-03-01), Terasaka et al.
patent: 4912928 (1990-04-01), Kaneko et al.

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