Ammonia reduction-denitration process and apparatus therefor

Details Ammonia reduction-denitration process and apparatus therefor Ammonia reduction-denitration process and apparatus therefor

1984-08-13

1986-02-18

Niebling, John F.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

422170, 422171, B01J 800, C01B 2100

Patent

active

045713294

ABSTRACT:
An ammonia reduction-denitration process for exhaust gases containing NO.sub.x consisting mainly of NO.sub.2, and an apparatus therefor are provided, which process comprises treating the exhaust gases with ammonia using a catalyst which is active to both a reaction of (NO.sub.2 +NH.sub.3 .fwdarw.N.sub.2 +N.sub.2 O+H.sub.2 O) and a reaction of (N.sub.2 O+NH.sub.3 .fwdarw.N.sub.2 +H.sub.2 O) at an area velocity of 3 m/h or less and in a concentration ratio of NH.sub.3 /NO.sub.2 of 1.3 or more. According to this process, it is possible to reduce NO.sub.2 contained in the exhaust gases with ammonia at one stage without by-producing N.sub.2 O.

REFERENCES:
patent: 4046888 (1977-09-01), Maeshima
patent: 4048112 (1977-09-01), Matsushita
patent: 4197375 (1979-06-01), Brown
patent: 4220632 (1980-09-01), Pence
patent: 4314913 (1982-02-01), Derrien

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