Reduction of nitrogen oxide and carbon monoxide in effluent gases
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United States of America Patent
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Mar 9, 1993
Issued Date -
N/A
app pub date -
Mar 12, 1991
filing date -
Sep 20, 1990
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Expired
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Abstract
A method is described for promoting a reaction between nitrogen oxide and carbon monoxide which comprises conducting the reaction in the presence of a dysprosium-containing catalyst which is free of noble metals and metals of the first transition series. More particularly, a method is described for reducing the nitrogen oxide and carbon monoxide content of effluent gas streams derived from the combustion of fossil fuels by contacting the effluent gases with a catalyst comprising dysprosium which is free of metals capable of promoting the oxidation of carbon monoxide. Generally, the catalyst is contacted with the effluent gases at temperatures of from about 300.degree. F. to about 1200.degree. F.
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