NO.sub.x reduction catalyst

Details NO.sub.x reduction catalyst NO.sub.x reduction catalyst

1998-07-10

2000-11-07

Dunn, Tom

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

Zeolite or clay, including gallium analogs

And group viii containing

502 60, 502 64, 502 66, B01J 2100

Patent

active

06143681&

ABSTRACT:
A volatile metal halide is sublimed over a zeolite, which is then exposed to water, dried and calcined. A promoter may then be incorporated into the zeolite structure by adding the zeolite to a solution of a rare earth salt resulting in a metal exchanged zeolite such as La-Fe/ZSM-5. Contacting exhaust gas with NO.sub.x over the catalyst results in reduction of the NO.sub.x to N.sub.2. The spent catalyst may be regenerated by heating in an oxygen atmosphere.

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Lunin et al., Iron-Bearing Catalysts in Selective Methane Reduction of NO, Doklady Physical Chemistry, vol. 349, Nos. 4-6, pp. 193-195, Apr. 1, 1996.
Feng et al., FeZSM-5: A Durable SCR Catalyst for NO.sub.x Removal from Combustion Streams, Journal of Catalysts 166, 368-376 (Article No. CA971530), 1997.
Fend et al. ("A durable SCR catalyst for NOx Removal from Combustion Streams"), Journal of Catalysis 166, pp. 368-376, 1997.

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