Compositions and methods for treating exhaust gases

Details Compositions and methods for treating exhaust gases Compositions and methods for treating exhaust gases

2007-08-01

2010-02-09

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, C423S237000, C423S239100, C060S282000, C060S299000, C060S301000

Reexamination Certificate

active

07658898

ABSTRACT:
The present invention provides compositions, systems, and methods for achieving high efficiencies of nitrogen oxide (NOx) removal from exhaust gases while minimizing ammonia slip and sulfur dioxide oxidation. In one embodiment, a method of removing nitrogen oxides from an exhaust gas comprises providing a first catalyst layer, adding an ammonia-containing compound to the exhaust gas upstream of the first catalyst layer in excess of the stoichiometric equivalent of the nitrogen oxides in the exhaust gas, flowing the exhaust gas through the first catalyst layer, selectively catalytically decomposing ammonia in excess of the stoichiometric reaction equivalent of the nitrogen oxides in the exhaust gas, and catalytically reducing the nitrogen oxides by reaction with ammonia not selectively catalytically decomposed.

REFERENCES:
patent: 3784675 (1974-01-01), Kobylinski et al.
patent: 3809743 (1974-05-01), Unland et al.
patent: 4071324 (1978-01-01), Reid
patent: 4307068 (1981-12-01), Matsumoto et al.
patent: 4335023 (1982-06-01), Dettling et al.
patent: 4472358 (1984-09-01), Khudenko
patent: 4758410 (1988-07-01), Grimm et al.
patent: 4833115 (1989-05-01), Koschling et al.
patent: 4904633 (1990-02-01), Ohata et al.
patent: 5055282 (1991-10-01), Shikada et al.
patent: 5076908 (1991-12-01), Stangeland et al.
patent: 5102634 (1992-04-01), Hayashi et al.
patent: 5387399 (1995-02-01), Nishida et al.
patent: 5449501 (1995-09-01), Luebke et al.
patent: 5494881 (1996-02-01), Machida et al.
patent: 5505910 (1996-04-01), Nishida et al.
patent: 5601798 (1997-02-01), Cooper et al.
patent: 5629067 (1997-05-01), Kotani et al.
patent: 5916529 (1999-06-01), Scheuerman
patent: 6080376 (2000-06-01), Iida et al.
patent: 6156277 (2000-12-01), Leibacher et al.
patent: 6159578 (2000-12-01), Ichikawa
patent: 6299845 (2001-10-01), Romatier et al.
patent: 6479026 (2002-11-01), Iida et al.
patent: 6852302 (2005-02-01), Ukai et al.
patent: 6863868 (2005-03-01), Alvin
patent: 2003/0086846 (2003-05-01), Adusei et al.
patent: 2004/0060239 (2004-04-01), Rostrup-Nielsen et al.
patent: 2005/0202971 (2005-09-01), DiFrancesco et al.
patent: 2005/0255021 (2005-11-01), DiFrancesco et al.
patent: 2006/0083671 (2006-04-01), Obayashi et al.
patent: 42 15 481 (1993-11-01), None
patent: 0 516 262 (1992-12-01), None
patent: 0 631 805 (1995-01-01), None
patent: 0 636 410 (1995-02-01), None
patent: 0 686 423 (1995-12-01), None
patent: 0 694 329 (1996-01-01), None
patent: 0 723 805 (1996-07-01), None
patent: 0 988 885 (2000-03-01), None
patent: 1 063 002 (2000-12-01), None
patent: 1146736 (1969-03-01), None
patent: 56113349 (1981-09-01), None
patent: 61024168 (1986-02-01), None
patent: 01306710 (1989-12-01), None
patent: 06018018 (1994-01-01), None
patent: 11022924 (1999-01-01), None
patent: 11207172 (1999-08-01), None
patent: 02239345 (2002-08-01), None
patent: 04162641 (2004-06-01), None
patent: WO 95/03887 (1995-02-01), None
Hums, “Is Advanced SCR Technology at a Standstill? A Provocatation for the Academic Community and Catalyst Manufacturers,” Catalyst Today, 1998, 42(1): 25-35.
Lefers et al, “Modeling of Selective Catalytic Denox Reactors,” Chemical Engineering and Technology, 1991, 14(3): 192-200.
Oxidation Catalyst, as printed from http://www.catalystproducts.com/12128/13052.html on Feb. 5, 2008.
Written Opinion of the International Searching Authority mailed Aug. 25, 2005 for Patent Cooperation Treaty Serial No. PCT/US2005/006287.
Improved Catalyst Can Clear The Air, Power Engineering, May 2006 Edition, 4 pages.
International Search Report for PCT/US2007/017154 dated Dec. 10, 2007, 3 pages.
Written Opinion of the International Searching Authority for PCT/US2007/017154, 8 pages dated Dec. 10, 2007.

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