Process and apparatus for removing NO.sub.x from gas streams
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United States of America Patent
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Dec 2, 1997
Grant Date -
N/A
app pub date -
Dec 13, 1993
filing date -
Sep 14, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Process and apparatus for reducing the NO.sub.x content of a gas stream containing NO.sub.x by reacting the gas stream with activated species. The activated species may be produced by providing a fluid reactant selected from HNCO, NH.sub.3, and H.sub.2 NNH.sub.2 and passing the fluid reactant across a catalyst. The activated species are believed to include free radicals selected from the group consisting of .circle-solid.NCO, .circle-solid.NH.sub.2, .circle-solid.NH, .circle-solid.H, .circle-solid.N, .circle-solid.OH, .circle-solid.NC, and mixtures thereof. The activation step takes place out of contact with the gas stream, so the catalyst or other activated species generator is not exposed to the gas stream. The activation step allows the contacting step and subsequent reaction of the activated species and the NO.sub.x to proceed more quickly, more completely, or at a lower temperature than would otherwise occur without the activation step.
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