Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Reexamination Certificate
2007-07-03
2007-07-03
Nguyen, Cam N. (Department: 1754)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
C502S326000, C502S327000, C502S328000, C502S330000, C502S332000, C502S333000, C502S334000, C502S339000, C502S302000, C502S303000, C502S304000, C502S527120, C502S527130
Reexamination Certificate
active
10707659
ABSTRACT:
The present invention provides a catalyst for use in a NOxtrap that has reduced NOxrelease during rich purges, increased NO conversion efficiency under stoichiometric conditions, and improved sulfur tolerance. The catalyst of this embodiment includes a precious metal, an oxygen storage component in contact with the precious metal, and a NOxstorage material. The oxygen storage component in contact with the precious metal is present in an amount that provides sufficient oxygen storage capacity to reduce the NOxrelease from the NOxtrap during rich purges to less than 20% of the NOxthat is stored in the NOxtrap across the operating temperature window of the NOxtrap, increase the NOxconversion efficiency under stoichiometric conditions to a value greater than 70%, and increase the sulfur tolerance of the NOxtrap.
REFERENCES:
patent: 5492878 (1996-02-01), Fujii et al.
patent: 5948376 (1999-09-01), Miyoshi et al.
patent: 6358880 (2002-03-01), Hedouin et al.
patent: 6395675 (2002-05-01), Suga et al.
patent: 6413483 (2002-07-01), Brisley et al.
patent: 6468941 (2002-10-01), Bortun et al.
patent: 6499294 (2002-12-01), Katoh et al.
patent: 6677272 (2004-01-01), Beall et al.
patent: 6897182 (2005-05-01), Cutler et al.
patent: 2002/0013226 (2002-01-01), Maunula
patent: 2002/0015674 (2002-02-01), Taniguchi et al.
patent: 2002/0048542 (2002-04-01), Deeba et al.
patent: 2002/0051122 (2002-05-01), Kakuta et al.
patent: 2002/0131914 (2002-09-01), Sung
patent: 2003/0021745 (2003-01-01), Chen
patent: 2003/0040432 (2003-02-01), Beall et al.
patent: 2004/0048741 (2004-03-01), Poulston et al.
patent: 2004/0198595 (2004-10-01), Chen
patent: 2006/0100097 (2006-05-01), Chigapov et al.
patent: 0 666 103 (1995-08-01), None
patent: 2 258 146 (1993-02-01), None
Goralski, Jr. Christian
Jen Hungwen
Surnilla Gopichandra
Theis Joseph
Ura Justin
Brooks & Kushman P.C.
Ford Global Technologies LLC
Nguyen Cam N.
Porcari Damian
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