Method for the reduction of nitrogen oxides from waste gases usi

Details Method for the reduction of nitrogen oxides from waste gases usi Method for the reduction of nitrogen oxides from waste gases usi

1989-12-14

1992-05-26

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

B01J 800, C01B 2100

Patent

active

051165864

ABSTRACT:
A zeolite catalyst and a method for reduction of nitrogen oxides present in waste gas streams is described. The method includes mixing the waste gas containing nitrogen oxides with ammonia. At an elevated temperature, this mixture is passed over a zeolite catalyst. Preferably, the zeolite catalyst is in a monolithic or honeycomb form. The zeolite catalyst includes one or more of the following subgroup metals: copper, iron, molybdeum and cerium. The zeolite catalysts made in accordance with this invention show better conversion of nitrogen oxides and longer life than known catalysts.

REFERENCES:
patent: 4018706 (1977-04-01), Inoue et al.
Seiyama et al., "Catalytic Reduction of Nitric Oxide with Ammonia over Transition Metal Ion Exchanged Y Zeolites", Chemistry Letters, (1975), pp. 781-784.

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