Purification of exhaust gas

Details Purification of exhaust gas Purification of exhaust gas

1973-10-02

1976-03-30

Peters, G. O.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Mixture is exhaust from internal-combustion engine

23288F, 23277C, 60299, 60301, 423210, F01N 314, B01D 5300

Patent

active

039475450

ABSTRACT:
There are provided an improved thermal reactor apparatus for, and an improved method of, purifying exhaust gases, particularly from a motor vehicle, wherein thermal oxidation and catalytic oxidation of the CO and HC contents of the exhaust gases and/or catalytic reduction of the NO.sub.x contents of the exhaust gases are effected within an environment such that at least some of the components of the reactor exposed to the exhaust gases are coated with and/or made of a catalytic alloy capable of acting as a catalyst for oxidation of the CO and HC contents of the exhaust gases and for reduction of the NO.sub.x contents of the exhaust gases.
In the preferable embodiment of the invention, the above mentioned environment comprises an upper stream zone occupied by a rich reducing gas mixture, including the starting exhaust gases, and a lower stream zone occupied by a rich oxidizing gas mixture, including the resultant gases from the upper stream zone and additional air.

REFERENCES:
patent: 3302394 (1967-02-01), Pahnke et al.
patent: 3460916 (1969-08-01), Aronsohn
patent: 3505028 (1970-04-01), Douthit
patent: 3701823 (1972-10-01), Hardison
patent: 3733181 (1973-05-01), Tourtellotte et al.
patent: 3756027 (1973-09-01), Gotoh et al.
patent: 3757521 (1973-09-01), Tourtellotte et al.
patent: 3773894 (1973-11-01), Bernstein et al.
patent: 3807173 (1974-04-01), Zmuda et al.

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