Reduction of nitrogen oxide in effluent gases using NCO radicals
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United States of America Patent
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Aug 10, 1993
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app pub date -
Mar 12, 1991
filing date -
Sep 20, 1990
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Abstract
A process is described for reducing the nitrogen content of a post combustion gas which comprises the steps of (A) generating NCO free radicals, and thereafter (B) adding the free radicals to the gas whereby the NCO free radicals react with the nitrogen oxide in the gas to form nitrogen and carbon dioxide. The NCO free radicals may be obtained from a variety of sources such as by the catalytic decomposition of cyanuric acid; the reaction of formaldehyde with nitrogen or nitric oxide; the reaction of carbon monoxide with nitrogen oxide or nitrogen or mixtures thereof; or the reaction of methanol with nitrogen in the presence of a catalyst. The NCO free radicals thus generated are effective for reducing the nitrogen oxide content of combustion gases in accordance with the process of the present invention at temperatures from ambient temperature up to about 2000.degree. F.
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