Substoichiometric air addition to first stage of dual catalyst s

Details Substoichiometric air addition to first stage of dual catalyst s Substoichiometric air addition to first stage of dual catalyst s

1972-12-29

1976-03-16

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60284, 60289, 60301, F02B 7510

Patent

active

039437094

ABSTRACT:
Process and apparatus for reducing emissions from internal combustion engine exhaust gas. The exhaust gas treatment system includes a first stage converter containing an NO.sub.x reduction catalyst, a second stage converter containing a catalyst for oxidation of CO and hydrocarbons, and means for admitting secondary air to the inlet of the second stage. Reduced CO and hydrocarbon emissions are obtained by admitting air in an amount not greater than that required to achieve a stoichiometric mixture to the inlet of the first stage during cold (i.e., choked) engine operation, discontinuing the flow of air to the first stage inlet when the average air-fuel ratio reaches approximately its normal warm engine value, and thereafter continuing operation without adding an appreciable quantity of air to the inlet of the first stage. The engine is operated with a substantially net rich average air-fuel ratio during warmup and with a slightly net rich average air-fuel ratio thereafter.

REFERENCES:
patent: 1902160 (1933-03-01), Frazer
patent: 3106820 (1963-10-01), Schaffer
patent: 3109715 (1963-11-01), Johnson
patent: 3544264 (1970-12-01), Hardison
patent: 3565574 (1971-02-01), Kearby
patent: 3662540 (1972-05-01), Murphey
patent: 3665711 (1972-05-01), Muroki
patent: 3757521 (1973-09-01), Tourtellotte
patent: 3771562 (1973-11-01), Curran
patent: 3826089 (1974-07-01), Nakajima

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