Power plants – Internal combustion engine with treatment or handling of... – By means producing a chemical reaction of a component of the...
Reexamination Certificate
2007-08-07
2007-08-07
Denion, Thomas (Department: 3748)
Power plants
Internal combustion engine with treatment or handling of...
By means producing a chemical reaction of a component of the...
C060S286000, C060S288000
Reexamination Certificate
active
11176710
ABSTRACT:
In an exhaust aftertreatment system comprising a NOx adsorber-catalyst followed by an SCR catalyst, means are provided for preventing the SCR catalyst from becoming heated to near the same peak temperatures as the NOx adsorber-catalyst during desulfation. In one embodiment, the means is a thermal mass between the NOx adsorber-catalyst and the SCR catalyst. In another embodiment, the means is a valve configured to selectively divert exhaust leaving the NOx adsorber-catalyst from the SCR catalyst. In a method of the invention, the NOx adsorber-catalyst temperature is cycled during desulfation. The peaks of the cycles are within an appropriate temperature range for desulfating the NOx adsorber-catalyst, but the average temperature is below the temperature range at which the SCR catalyst is damaged. The temperature peaks are damped as they travel from the NOx adsorber-catalyst to the SCR, whereby the SCR experiences much lower peak temperatures than the NOx adsorber-catalyst.
REFERENCES:
patent: 3981145 (1976-09-01), Noguchi et al.
patent: 5211012 (1993-05-01), Swars
patent: 5402641 (1995-04-01), Katoh et al.
patent: 5974793 (1999-11-01), Kingusa et al.
patent: 6109024 (2000-08-01), Kingusa et al.
patent: 6161378 (2000-12-01), Hanaoka et al.
patent: 6176079 (2001-01-01), Konrad et al.
patent: 6182443 (2001-02-01), Jarvis et al.
patent: 6357226 (2002-03-01), Borland
patent: 6530216 (2003-03-01), Pott
patent: 6718753 (2004-04-01), Bromberg et al.
patent: 6732507 (2004-05-01), Stanglmaier et al.
patent: 6766642 (2004-07-01), Binder et al.
patent: 6820417 (2004-11-01), May et al.
patent: 6835689 (2004-12-01), He et al.
patent: 6845612 (2005-01-01), Jobson et al.
patent: 6863874 (2005-03-01), Twigg
patent: 6871489 (2005-03-01), Tumati et al.
patent: 6871490 (2005-03-01), Liang et al.
patent: 7082753 (2006-08-01), Dalla Betta et al.
patent: 7117669 (2006-10-01), Kaboord et al.
patent: 2003/0101713 (2003-06-01), Dalla Betta et al.
patent: 2004/0050037 (2004-03-01), Betta et al.
patent: 2004/0076565 (2004-04-01), Gandhi et al.
patent: 2004/0175315 (2004-09-01), Brisley et al.
patent: 2005/0129601 (2005-06-01), Li et al.
patent: 2006/0010857 (2006-01-01), Hu et al.
patent: WO 2004/061278 (2004-07-01), None
patent: WO 2004/090296 (2004-10-01), None
patent: WO 2005/014146 (2005-02-01), None
Hakim et al., NOx Adsorbers for Heavy Duty Truck Engines—Testing and Simulation.
Hu Haoran
McCarthy, Jr. James Edward
Yan Jiyang
Denion Thomas
Eaton Corporation
Edwards Loren
Keller Paul V.
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