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

1998-09-22

2000-06-13

Dunn, Tom

Catalyst, solid sorbent, or support therefor: product or process

Zeolite or clay, including gallium analogs

And group viii containing

502 64, 502 66, B01J 2100

Patent

active

060749768

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.
patent: 5648558 (1997-07-01), Hatano et al.
JP 5 220 403 English language Abstracts as follows:
Database WPI, Section Ch, Week 9339, Derwent Publications Ltd., London, Great Britain, Class E36, AN 93-308484, (1993).
Suzuki Hiromasa, "Exhaust Gas Purifying Catalyst," Patent Abstracts of Japan, vol. 17, No.: 670, C-1139, Dec. 1993, JP, A5,220,403.
Li et al. The Effect of SO.sub.2 on the Catalytic Performance of Co-ZSM-5 and Co-ferrierite for the selective reduction of NO by CH.sub.4 in the presence of O.sub.2, Applied Catalysis, (1995) pp. L257-L270.

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