Engine exhaust gas purification device

Details Engine exhaust gas purification device Engine exhaust gas purification device

1994-11-23

1996-09-03

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

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

60297, 60301, F01N 322

Patent

active

055512313

ABSTRACT:
An exhaust gas purification device comprising a three way catalyst, an oxidizing catalyst and a NOx absorbent which are arranged in this order in the exhaust passage. A rich air-fuel mixture is burned in the combustion chamber, and secondary air is supplied upstream of the three way catalyst so as to make the air-fuel ratio of the exhaust gas flowing into the three way catalyst a rich air-fuel ratio greater than the air-fuel ratio of the air-fuel mixture burned in the combustion chamber. Further, secondary air is supplied upstream of the oxidizing catalyst to make the air-fuel ratio of the exhaust gas flowing into the oxidizing catalyst and the NOx absorbent slightly leaner than the stoichiometric air-fuel ratio.

REFERENCES:
patent: 5235956 (1993-08-01), Yoshizaki
patent: 5388406 (1995-02-01), Takeshima et al.
patent: 5433074 (1995-07-01), Seto et al.
"NO Removal by Absorption into BaO-CuO Binary Oxides" (J. Chem. Soc., Chem. Commun., pp. 1165-1166) (1990).
"Formation and Decomposition of BaCuO.sub.2.5 Prepared from a Mixture of Nitrates" (Journal of Solid State Chemistry, pp. 176-179) (1991).
"NO Removal by Absoprtion into Ba-Cu -O Binary Oxides" (Catalyst vol. 33, No. 2, pp. 87-90) (1991).

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