Method of making ultrasmall crystal MTT molecular sieves

Details Method of making ultrasmall crystal MTT molecular sieves Method of making ultrasmall crystal MTT molecular sieves

2007-11-26

2010-11-02

Brunsman, David M (Department: 1793)

Chemistry of inorganic compounds

Zeolite

Organic compound used to form zeolite

C423S718000

Reexamination Certificate

active

07824658

ABSTRACT:
A method for preparing a crystalline molecular sieve having MTT framework topology and crystallite sizes of about 150 to about 600 Angstroms, comprising:a. preparing a reaction mixture comprising, in terms of mole ratios, the following.YO2/W2O330-40R+/YO20.06-0.12OH−/YO20.20-0.26K+/YO20.09-0.15and an amount of water not substantially in excess of the amount required to cause and maintain crystallization, wherein Y is silicon, germanium or mixtures thereof; W is aluminum, boron, gallium, iron or mixtures thereof; and R+is a diisopropylimidazolium cation, andb. heating said reaction mixture at crystallization conditions and in the absence of an external liquid phase for sufficient time to form a crystallized material containing crystals of the molecular sieve.Also, a method to make the shaped ultrasmall crystal MTT molecular sieve, and a method to form the molecular sieve using a particular order of addition of components.

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