Catalytic method for selectively reducing nitrogen oxides
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United States of America Patent
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Sep 22, 1998
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N/A
app pub date -
Mar 14, 1997
filing date -
Jun 30, 1993
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Abstract
A method for the catalytic removal of nitrogen oxides, methane and carbon monoxide out of oxygen-rich exhaust gases emitted from motors that may combust natural gas by contacting the exhaust gas with a zeolite of the NFI structure that contains palladium. The palladium containing zeolite has been activated under oxygen prior to use by calcining the palladium containing zeolite at about 300.degree. C. for about one hour, then calcining the palladium containing zeolite at about 500.degree. C. for about one hour, and cooling the palladium containing zeolite to about 300.degree. C.
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