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AssigneeKorea Power Enginering Company
InventorsSung-Ho Hong, Hyun-Young Chang, Seok-Joo Hong, Dong-Won Kim, Sung-Chang Hong, Tae-Sung Park, Dong-Sup Doh, Soon-Kwan Jung
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There is disclosed a method for removing nitrogen oxides of exhaust gas using natural manganese ores. In the method, ammonia is used as a reductant to selectively reduce the nitrogen oxides in the presence of a catalyst prepared from the natural manganese ores. The catalyst allows nitrogen oxides to be completely removed from exhaust gas at a relatively low temperature of 130-250° C. without discharging unreacted ammonia through oxidation reaction. The catalyst is superior in economic terms in addition to preventing the deleterious effects which occur when discharging ammonia.
A method for removing nitrogen oxides in an exhaust gas, which comprises carrying out a selective catalytic reduction by use of ammonia as a reductant in the presence of a catalyst comprising natural manganese ores at a temperature of 130-250° C. to remove the nitrogen oxides, wherein the natural manganese ores contain 50-90 wt % of pyrolusite of beta-MnO2 as a main component.
Dependencies are inferred from the claim text.