Method for removing nitrogen oxides using natural manganese ores
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United States of America Patent
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Nov 4, 2003
Grant Date -
Oct 24, 2002
app pub date -
Sep 6, 2001
filing date -
May 17, 1997
priority date (Note) -
Expired
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Abstract
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.degree. 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.
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