Synthesis of large crystallite zeolites
AssigneeMobil Oil Corporation
InventorsFrancis G. Dwyer, Pochen Chu, William E. Cormier, Jr.
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Abstract
The invention provides a method of making large crystallite zeolites by a method comprising forming the zeolite in a medium containing a combination of two different alkylammonium cations or a combination of an alkylammonium cation and a metallic cation. In the combination at least one of the cations will have an ionic radius of from about 1.40 to the pore size of the specific zeolite.
Claims10
In a method of preparing a crystalline aluminosilicate zeolite having a SiO.sub.2 to Al.sub.2 O.sub.3 molar ratio of from about 25 to about 1000 and a Constraint Index of from 1 to 12 from an aqueous reaction mixture comprising sources of silica, alumina and alkylammonium cations and metal cations, the improvement which comprises having in the reaction medium for which said zeolite is prepared, metal cations having an ionic radius of from 1.40 A to the pore size of the specific zeolite whereby the crystal size of the zeolite product in increased to at least 1 micron.
Dependencies are inferred from the claim text.