Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Patent
1993-12-13
1997-12-02
Straub, Gary P.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
4232391, C01B 2100
Patent
active
056933002
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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Dunn Jr. Thomas G.
Noxtech, Inc.
Straub Gary P.
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