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

1991-02-07

1993-03-02

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

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

60303, F01N 328

Patent

active

051898764

ABSTRACT:
An exhaust gas purification system for an internal combustion engine includes an engine 1 capable of fuel combustion at lean air-fuel ratios, a lean NOx catalyst 3 installed in an exhaust conduit 16 of the engine, an HC producing means for producing hydrocarbons of low boiling points utilizing fuel for the engine, and an HC supply means for supplying the hydrocarbons of low boiling points to the exhaust conduit upstream of the lean NOx catalyst 3. NOx reduction reaction needs hydrocarbons of low boiling points. The HC producing means produces hydrocarbons of low boiling points from diesel oil by cracking, fractional distillation, or both cracking and fractional distillation. The cracked and/or distilled fuel includes a large amount of hydrocarbons of low boiling points and increases NOx purification rate of the lean NOx catalyst when the hydrocarbons of low boiling points are introduced into the exhaust conduit by the HC supply means.

REFERENCES:
patent: 3635200 (1972-01-01), Rundell et al.
patent: 3827238 (1974-08-01), Hayashi
patent: 3908371 (1975-09-01), Nagai et al.
patent: 4188364 (1980-02-01), Gladden

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