Process for improved 3-way emission control

Details Process for improved 3-way emission control Process for improved 3-way emission control

1976-12-06

1978-01-31

Peters, G. O.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Mixture is exhaust from internal-combustion engine

423288, B01D 5334

Patent

active

040716007

ABSTRACT:
A process for improved three-way emissions control comprising the steps of contacting the emissions stream with a first catalyst consisting of rhodium supported on a refractory substrate to effect the selective chemical reduction of nitric oxide to nitrogen, said rhodium being present in an amount of at least about 0.002% by weight of the catalyst, said emissions stream being then contacted with a second catalyst consisting of at least one of the noble metals selected from the group of platinum and palladium, said noble metal being present in a small but effective amount to accomplish the oxidation of the hydrocarbons and carbon monoxide left in said emissions stream, said process being accomplished without the addition of oxygen to said emissions stream.

REFERENCES:
patent: 3370914 (1968-02-01), Gross
patent: 3801667 (1974-04-01), Kobyliwski
patent: 3914376 (1975-10-01), Barker
patent: 3929965 (1975-12-01), Kim et al.

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