Preparation of Molecular Sieves Using a Structure Directing Agent and An N, N, N-Triakyl Benzyl Quaternary Ammonium Cation
AssigneeChevron U.S.A. Inc.
InventorStacey I. Zones
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Abstract
Crystalline molecular sieves are prepared using a mixture comprising an organic structure directing agent capable of forming the molecular-sieve and an N,N,N-trialkyl benzyl quaternary ammonium cation.
Claims18
A method for preparing a crystalline molecular sieve having a mole ratio greater than about 15 of (1) an oxide of a first tetravalent element to (2) an oxide of a trivalent element, pentavalent element, second tetravalent element which is different from said first tetravalent element or mixture thereof, said method comprising:
- A. forming an aqueous reaction mixture comprising (1) a source of the oxide of the first tetravalent element;
- (2) a source of the oxide of the trivalent element, pentavalent element, second tetravalent element which is different from said first tetravalent element or mixture thereof;
- (3) a source of alkali metal or alkaline earth metal;
- (4) an organic structure directing agent capable of forming the molecular sieve, and (5) an N,N,N-trialkyl benzyl quaternary ammonium cation;
- and
- B. maintaining said aqueous mixture under sufficient crystallization conditions until crystals are formed.
A molecular sieve having a composition, as-synthesized and in the anhydrous state, in terms of mole ratios as follows:
- (1 to 5 or higher) Q:(0.1 to 1) Mn+:XaOb (greater than 15) YO2
- where Y is silicon, germanium or a mixture thereof, X is aluminum boron, gallium, titanium, iron or mixtures thereof, a is 1 or 2, b is 2 when a is 1, b is 3 when a is 2, M is an alkali metal or alkaline earth metal, n is the valence of M, and Q is a mixture of an organic structure directing agent capable of forming the molecular sieve, and an N,N,N-trialkyl benzyl quaternary ammonium cation.
Dependencies are inferred from the claim text.