Zeolite L preparation
AssigneeExxon Chemical Patents Inc. (ECPI)
InventorJohannes P. Verduijn
Life of this patent
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Abstract
Zeolite L containing caesium having enhanced catalytic properties is prepared by a process in which said zeolite L is crystallized from a synthesis mixture with a molar composition (expressed as oxides) of: ______________________________________ K.sub.2 O/SiO.sub.2 0.22 to 0.30 K.sub.2 O/Cs.sub.2 O 5 to 12 H.sub.2 O/K.sub.2 O 50 to 90 and SiO.sub.2 /Al.sub.2 O.sub.3 6.0 to 7.0 ______________________________________ and containing 0.5 to 20 ppm (by weight) of divalent metal cations, e.g. Mg ions. The zeolite L can form part of a dehydrocyclization and/or isomerisation catalyst.
Claims7
A process for the preparation of a zeolite L substantially free of pollucite and comprising cylindrical crystallites having basal planes wherein at least 80% of the basal planes are microscopically flat to within about 200 .ANG. and do not exhibit spiral step growths thereon and containing cesium in which said zeolite L is crystallized from a synthesis mixture with a molar composition (expressed as oxides) of:
- ______________________________________ K.sub.2 O/SiO.sub.2 0.22 to 0.30 K.sub.2 O/Cs.sub.2 O 5 to 12 H.sub.2 O/K.sub.2 O 50 to 90 and SiO.sub.2 /Al.sub.2 O.sub.3 6.0 to 6.7 ______________________________________
- and containing at least 0.5 ppm (by weight) of divalent metal cations.
A zeolite L substantially free of pollucite and comprising cylindrical crystallites having basal planes wherein at least 80% of the basal planes are microscopically flat to within about 200 .ANG. and do not exhibit spiral step growths thereon, said zeolite L having the formula expressed as molar ratio of the oxides:
- 0.9-1.3 M'.sub.2 O:Al.sub.2 O.sub.3 :<5.0SiO.sub.2 :yH.sub.2 O where M' represents mixed K and Cs cations and y is from 0 to 9.
Dependencies are inferred from the claim text.