Zeolite L
AssigneeExxon Chemical Patents Inc.
InventorJohannes P. Verduijn
Life of this patent
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Abstract
Potassium zeolites of type L in which the crystals are very flat cylinders of "hockeypuck" or "coin" shape may be prepared by adjusting the K.sub.2 O/SiO.sub.2 and SiO.sub.2 /Al.sub.2 O.sub.3 ratio and including in the mixture from which the zeolite is crystallized a small amount of divalent cation such as magnesium or barium. The resulting zeolite has a short channel length and is particularly useful as a base for aromatization catalysis.
Claims30
A Crystalline type L Zeolite L in which the crystals are cylindrical and have an average length of 0.6 microns or less and an average length:diameter ratio of less than 0.2 and have substantially flat basal planes.
A process for preparing a crystalline aluminosilicate L zeolite in which the crystals are cylindrical and have an average length of 0.6 microns or less and an average length:
- diameter ratio of less than 0.2 comprising:
- a. forming a mixture of q moles of water, a divalent cation, a source of m moles of K.sub.2 O, a source of n moles of SiO.sub.2 and a source of p moles of Al.sub.2 O.sub.3 wherein m:n is 0.2 to 0.35, n:p is 15 to 160 and q:m is 45 to 70;
- and
- b. heating said mixture for a period of time sufficient to crystallize the zeolite.
A process for the aromatization of a petroleum hydrocarbon feed stream comprising contacting the feed stream under aromatization conditions with a crystalline KL zeolite impregnated with an aromatization promoter metal, in which the crystals of said zeolite are cylindrical and have an average length of 0.6 microns or less and an average length:diameter ratio of less than 0.2 and have substantially flat basal planes.
Dependencies are inferred from the claim text.