DENITRATION METHOD BY REDUCTION WITH AMMONIA AND ITS APPARATUS

Title:

DENITRATION METHOD BY REDUCTION WITH AMMONIA AND ITS APPARATUS

Document Type and Number:

Japanese Patent JPS6022922

Kind Code:

A

Abstract:

PURPOSE: To reduce NO2 by NH3 in a single stage without by-producing N2O by using a high-activity catalyst for the reduction of NO2 and N2O with NH3.

CONSTITUTION: The alkali metal or alkaline-earth metal of natural or synthetic zeolite is substituted with hydrogen and/or iron to obtain a catalyst. The catalyst is active not only to the denitration of N2O by reduction with ammonia but also to the denitration of NO2. The so-called high-silica zeolite having ≥3 ratio of SiO2/Al2O3 can be suitably used as the zeolite. The substitution is carried out by immersing zeolite into an aq. soln. of hydrochloric acid, NH4Cl, FeCl3, or ferric nitrate, and then calcining at 500°C to manufacture the catalyst. The amt. of NH3 injected during the nitration is preferably regulated to ≥1.34 NH3/NOx, especially to ≥1.6.

Inventors:

KATOU YASUYOSHI
KONISHI KUNIHIKO
OOTA MASAO

Application Number:

JP13076783A

Publication Date:

February 05, 1985

Filing Date:

July 20, 1983

Export Citation:

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