High activity MTT framework type molecular sieves
AssigneeExxonMobil Research and Engineering Company
InventorsWenyih F. Lai, Christine N. Elia
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Abstract
A process is described of producing an MTT framework type molecular sieve by crystallizing a mixture capable of forming said molecular sieve, wherein the mixture comprises sources of alkali or alkaline earth metal (M), an oxide of trivalent element (X), an oxide of tetravalent element (Y), water and a directing agent (R) of the formula (CH3)3N+CH2CH2CH2N+(CH3)2CH2CH2CH2N+(CH3)3, and has a composition, in terms of mole ratios, within the following ranges. YO2/X2O3 less than 45 H2O/YO2 5 to 100 OH−/YO2 0.05 to 0.5 M/YO2 0.05 to 0.5 and R/YO2>0 to <0.5.
Claims20
A process of producing an MTT framework type molecular sieve, the process comprising:
- (a) preparing a mixture capable of forming said molecular sieve, said mixture comprising sources of alkali or alkaline earth metal (M), an oxide of trivalent element (X), an oxide of tetravalent element (Y), water and a directing agent (R) of the formula (CH3)3N+CH2CH2CH2N+(CH3)2CH2CH2CH2N+(CH3)3, and having a composition, in terms of mole ratios, within the following ranges:
- YO2/X2O3 less than 45
- H2O/YO2 5 to 100
- OH−/YO2 0.05 to 0.5
- M/YO2 0.05 to 0.5
- R/YO2>0 to <0.5;
- and
- (b) maintaining said mixture under sufficient conditions to produce said MTT framework type molecular sieve.
An MTT framework type aluminosilicate molecular sieve having a silica to alumina molar ratio less than 45 and an external surface area less than about 80 m2/g.
An MTT framework type aluminosilicate molecular sieve having a silica to alumina molar ratio from 25 to less than 30.
Dependencies are inferred from the claim text.