Two-stage catalysis of engine exhaust

Details Two-stage catalysis of engine exhaust Two-stage catalysis of engine exhaust

1978-07-13

1980-02-12

Peters, G. O.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Mixture is exhaust from internal-combustion engine

4232137, 422171, B01D 5334

Patent

active

041883640

ABSTRACT:
The invention relates to reduction of nitric oxide in exhausts from hydrocarbon burning engines. The nitric oxide is reacted with ammonia over a first catalyst and then the excess ammonia is reacted with oxygen present in the exhaust gas over a second catalyst. The resulting effluent stream has greatly reduced nitric oxide content without having an objectionable content.

REFERENCES:
patent: 3499063 (1969-06-01), Griffing et al.
patent: 3599427 (1969-09-01), Jones
patent: 3895094 (1975-07-01), Carter
patent: 3970739 (1976-07-01), Shiraishi et al.
Oka et al., "Hydrocarbon Processing;" Oct. 1974, pp. 113-114.

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