Process and catalyst for reducing No.sub.x in exhaust combustion

Details Process and catalyst for reducing No.sub.x in exhaust combustion Process and catalyst for reducing No.sub.x in exhaust combustion

1997-09-30

1999-02-09

Lewis, Michael L.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

4232132, 4232135, B01J 800

Patent

active

058690131

ABSTRACT:
The present invention relates to a process for the catalytic reduction of nitrogen oxides contained in exhaust gases from combustion, which process comprises bringing said exhaust gases into contact with a Beta Zeolite exchanged with suitable amounts of cobalt salts, in the presence of a light hydrocarbon as the reducing agent. The present invention relates also to a catalyst for such a process, which catalyst comprises a Beta zeolite exchanged with cobalt salts, characterized by a Co: zeolite AL molar ratio of<0.5.

REFERENCES:
patent: 3308069 (1967-03-01), Wadlinger et al.
patent: 4867954 (1989-09-01), Staniulis et al.
patent: 5149512 (1992-09-01), Li et al.
"Catalyst for cleaning exhaust gas-comprises zeolite-beta on which copper, copper.RTM., iron.RTM. or platinum is supported", Database WPI, Section Ch, Week 9339, Derwent Publications Ltd., London, Great Britain, Class E36, AN 93-308484.
Suzuki Hiromasa, "Exhaust Gas Purifying Catalyst", Patent Abstracts of Japan, vol.: 17, No. 670, C-1139, Dec. 1993, JP, A 5 220 403, Aug. 1993. (abstract only).

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