Methods for the preparation of molecular sieves, including zeolites, using metal chelate complexes
AssigneeBoard of Regents, The University of Texas System
InventorsKenneth J. Balkus, Stanislaw Kowalak
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Abstract
The present disclosure relates to improved methods for the preparation of aluminum phosphate molecular sieves and faujasite-type zeolites having stably encapsulated multidentate metal chelate complexes. This is achieved through direct incorporation of a selected multidentate chelate complex into the molecular sieve or zeolite reaction admixture prior to crystallization, allowing the admixture to react under conditions appropriate for the selected molecular sieve or zeolite, followed by preparation of the resultant molecular sieve-metal chelate complex in a highly crystalline form.
Claims44
A process for the preparation of zeolites of the faujasite group which includes an encapsulated multidentate metal chelate complex, the process comprising the steps of:
- preparing an aqueous alkaline admixture of aluminate and silicate anions and an alkaline or alkaline earth hydroxide, in molar ratios and a pH appropriate for the formation of a zeolite of the faujasite group;
- introducing a multidentate metal chelate complex larger than nominal pore size of the faujasite zeolite into the admixture;
- reacting the admixture under conditions appropriate for the formation of a crystalline zeolite of the faujasite group;
- and
- preparing from the reacted admixture a crystalline zeolite having the multidentate metal complex encapsulated within the zeolite.
A process for the preparation of a crystalline aluminum phosphate molecular sieve which includes an encapsulated multidentate metal chelate complex, the process comprising the steps of:
- a) preparing an aqueous acidic admixture of aluminate and phosphate anions in molar ratios appropriate for the formation of an aluminum phosphate molecular sieve;
- b) introducing a multidentate metal chelate complex larger than nominal pore size of the crystalline aluminophosphate molecular sieve into the admixture;
- c) reacting the admixture under conditions appropriate for the formation of an aluminum phosphate molecular sieve;
- and
- d) preparing from the reacted admixture the molecular sieve having the multidentate metal chelate complex encapsulated within the molecular sieve.
Dependencies are inferred from the claim text.