Nitrogen oxide reduction system

Details Nitrogen oxide reduction system Nitrogen oxide reduction system

1973-10-24

1976-08-03

Garvin, Patrick P.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

4232135, B01J 2102

Patent

active

039728315

ABSTRACT:
A system is proposed for the purification of exhaust gases from internal combustion engines, preferably the reduction of nitrogen oxides in exhaust gases from internal combustion engines in which nitrogen is selectively formed as substantially the only nitrogen-containing product. The exhaust gas is contacted at an elevated temperature with a noble metal in a reducing atmosphere, wherein nitrogen oxides are selectively converted to nitrogen as substantially the only nitrogen containing product, and/or is contacted with a noble metal in an oxidizing atmosphere, wherein carbon monoxide and unburned hydrocarbons are converted to carbon dioxide and water, said noble metal being distended on a microporous glass body. In a preferred embodiment the exhaust gas is contacted at an elevated temperature in a reducing atmosphere with ruthenium supported on a microporous glass body comprising a leached, phase-separated alkali borosilicate.

REFERENCES:
patent: 2106744 (1938-02-01), Hood et al.
patent: 2315329 (1943-03-01), Hood et al.
patent: 2480672 (1949-08-01), Plank
patent: 2500801 (1950-03-01), Church
patent: 3053612 (1962-09-01), DE Rosset
patent: 3189563 (1965-06-01), Havel
patent: 3619127 (1971-11-01), Hass et al.
patent: 3637344 (1972-01-01), Thompson
patent: 3804647 (1974-04-01), Elmer et al.

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