Reduction of nitrogen oxide in effluent gases using formaldehyde
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United States of America Patent
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Jan 7, 1992
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N/A
app pub date -
Sep 20, 1990
filing date -
Sep 20, 1990
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Abstract
A method is described for reducing the nitrogen oxide content of an effluent gas stream which comprises contacting the effluent gas with an amount of formaldehyde which is effective in reducing the nitrogen oxide content of the gas. In one preferred embodiment, the formaldehyde is contacted with the effluent stream in the presence of a catalyst which promotes the reaction between the formaldehyde and the nitrogen oxide contained in the gas stream. Preferred catalysts comprise zirconium, cerium, or mixtures thereof. Catalysts comprising zirconium in the plus four oxidation state, cerium in the plus four oxidation state, or mixtures thereof are particularly preferred catalysts.
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