Catalyst – solid sorbent – or support therefor: product or process – Zeolite or clay – including gallium analogs – And additional al or si containing component
Reexamination Certificate
2007-01-09
2007-01-09
Wood, Elizabeth D. (Department: 1755)
Catalyst, solid sorbent, or support therefor: product or process
Zeolite or clay, including gallium analogs
And additional al or si containing component
C502S064000
Reexamination Certificate
active
10462126
ABSTRACT:
The present invention provides a catalyst system that may be used to regenerate NOxadsorber catalysts. It also provides methods for using these catalysts. According to the present invention, hydrocarbons are introduced into an exhaust gas stream upstream of a metal ion exchanged zeolite catalyst to generate CO. The metal ion exchanged zeolite catalyst is preferably a Cu-ZSM-5 catalyst that has a high loading of copper. The hydrocarbons are oxidized to carbon monoxide, and the carbon monoxide is then exposed to a NOxadsorber catalyst, which facilitates regeneration of that catalyst.
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Crocker Mark
Leprince Thierry
Matsumoto Takeshi
Nakaene Takuji
Kalow & Springut LLP
Locke Scott D.
Umicore AG & Co. KG
Wood Elizabeth D.
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