Synthesis of DDR framework-type molecular sieves
AssigneeExxonMobil Research and Engineering Company
InventorsAllen W. Burton, Eugene Terefenko
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Abstract
A process for synthesizing a DDR framework-type molecular sieve comprises crystallizing a reaction mixture comprising water, a source of silicon, and a structure directing agent, Q, selected from the group consisting of a methyltropinium salt, a 2,6,N,N-tetramethylpiperidinium salt, a 2,N,N-trimethylpiperidinium salt and mixtures thereof, wherein the reaction mixture has a molar ratio of water to silicon from 5 to 80 and a molar ratio of alkali or alkaline earth metal, M, to silicon less than 0.01.
Claims14
A process for synthesizing a DDR framework-type molecular sieve, the process comprising.
- (a) forming a reaction mixture capable of forming the molecular sieve, the mixture comprising water, a source of silicon, and a structure directing agent, Q, selected from the group consisting of a methyltropinium salt, a 2,6,N,N-tetramethylpiperidinium salt, a 2,N,N-trimethylpiperidinium salt and mixtures thereof, wherein the reaction mixture has a molar ratio of water to silicon from 5:1 to 80:1 and a molar ratio of alkali or alkaline earth metal, M, to silicon less than 0.01:1;
- (b) heating said reaction mixture under conditions effective to produce crystals of the DDR framework-type molecular sieve;
- and
- (c) recovering crystals of the DDR framework-type molecular sieve produced in (b).
Dependencies are inferred from the claim text.