Exhaust gas purification device for an engine

Details Exhaust gas purification device for an engine Exhaust gas purification device for an engine

1993-07-26

1995-07-18

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

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

60285, 60286, 60289, 60297, 422169, 4232137, F01N 322, F01N 320

Patent

active

054330742

ABSTRACT:
An engine comprising an exhaust passage having therein a NO.sub.x absorbent which absorbs the NO.sub.x when the air-fuel ratio of the exhaust gas flowing into the NO.sub.x absorbent is lean and releases the absorbed NO.sub.x when the air-fuel ratio of the exhaust gas flowing into the NO.sub.x absorbent becomes the stoichiometric air-fuel ratio or rich. A catalyst having an O.sub.2 storage function is arranged in the exhaust passage downstream of the NO.sub.x absorbent. When NO.sub.x is to be released from the NO.sub.x absorbent, the air-fuel ratio of the exhaust gas is made rich to an extent such that the amount of unburned HC and CO is excessive beyond an amount necessary to reduce the whole NO.sub.x.

REFERENCES:
patent: 5201802 (1993-04-01), Hirota
patent: 5211010 (1993-05-01), Hirota
J. Chem. Soc., Chem. Commun., 1990, pp. 1165-1166 "No Removal by Absorption into BaO-CuO Binary Oxides".
Journal of Solid State Chemistry 91, pp. 176-179 (1991) "Formation and Decomposition of BACuO.sub.2.5 Prepared from a Mixture of Nitrates".
67th CATSJ Meeting Abstracts No. A9, vol. 33, No. 2, 1991, pp. 87-90 "No Removal by Absorption into Ba-Cu-O Binary Oxides".

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