Catalyst – solid sorbent – or support therefor: product or process – Zeolite or clay – including gallium analogs
Reexamination Certificate
2005-10-25
2009-06-30
Wood, Elizabeth D (Department: 1793)
Catalyst, solid sorbent, or support therefor: product or process
Zeolite or clay, including gallium analogs
C502S064000, C502S085000
Reexamination Certificate
active
07553790
ABSTRACT:
The present invention describes a method to increase the activity of a catalyst by first performing an ion exchange step with a potassium ion, followed by performing an ion-exchange step with an ammonium ion. Specifically, the present invention describes a method to increase the acidity of a zeolite by incorporating a potassium salt ion-exchange prior to an ammonium salt ion-exchange step. Even more specifically, the present invention is drawn to a method of increasing the activity of a zeolite by employing more than one potassium ion exchanges followed by at least one ammonium ion exchange. The present invention also describes a method to reduce the amount of sodium normally found in commercially produced zeolite by employing any of these methods. The present invention is also drawn to the catalysts produced by any of these methods.
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Occelli et al., “The effects of Na ions on the properties of calcined rare-earth Y (CREY) zeolites”, Applied Catalysis A : General 183 (1999) 53-99, no month.
Beeckman Jean W.
Elia Christine N.
Lissy Daria N.
Mazzone Dominick N.
McCarthy Stephen J.
ExxonMobil Research and Engineering Company
Montalvo L.
Purwin P. E.
Wood Elizabeth D
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