Reduction of nitrogen oxides using multiple split streams

Details Reduction of nitrogen oxides using multiple split streams Reduction of nitrogen oxides using multiple split streams

2007-01-10

2009-02-24

Vanoy, Timothy C (Department: 1793)

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Mixture is exhaust from internal-combustion engine

C423S213500, C423S213700, C423S235000, C423S236000, C423S237000, C423S239100, C422S168000, C422S169000, C422S170000, C422S171000, C422S172000, C422S177000, C422S180000, C422S181000, C060S274000, C060S282000, C060S299000, C060S301000, C060S324000

Reexamination Certificate

active

07494634

ABSTRACT:
Systems and methods of removing at least nitrogen oxides from an exhaust fluid generally include dividing a flow of an exhaust fluid comprising a concentration of nitric oxide into three types of flow-through cells. The first flow-through cell comprises a catalyst configured to reduce the nitric oxide with a reductant to form a first feedstream comprising nitrogen containing species derived therefrom. The second flow-through cell comprises a catalyst configured to oxidize nitric oxide to form a second feedstream comprising nitrogen dioxide. The third flow-through cell does not change the nitric oxide concentration and form a third feedstream comprising nitric oxide. After flowing through the three different types of cells, the feedstreams are mixed to form a homogenous mixture and then fed to a catalyst bed configured to convert the nitrogen containing species, the nitric oxide, and the nitrogen dioxide to a fluid comprising nitrogen gas and water.

REFERENCES:
patent: 5863508 (1999-01-01), Lachman et al.
patent: 6835689 (2004-12-01), He et al.
patent: 2005/0002843 (2005-01-01), Kim et al.
patent: 2008/0102010 (2008-05-01), Bruck et al.
patent: 1422395 (2006-06-01), None

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