Process for preparing MTT zeolites using nitrogen-containing organic compounds
AssigneeChevron U.S.A. Inc.
InventorsAllen W. Burton, Jr., Stacey Zones
Life of this patent
Estimating the term…
Abstract
The present invention relates to a process for preparing zeolites having the MTT framework topology defined by the connectivity of the tetrahedral atoms in the zeolite, such as zeolites SSZ-32 and ZSM-23, using certain nitrogen-containing organic compounds.
Claims16
A process for preparing a zeolite having the MTT framework topology defined by the connectivity of the tetrahedral atoms in the zeolite, said process comprising:
- (a) preparing a reaction mixture comprising (1) sources of an alkali metal oxide, alkaline earth metal oxide or mixtures thereof;
- (2) optionally, sources of an oxide selected from the oxides of aluminum, boron, iron, gallium, indium, titanium, vanadium or mixtures thereof;
- (3) sources of silicon oxide;
- and (4) at least one nitrogen-containing organic compound selected from the group consisting of the following:
- where pol. indicates that the molecule is polymeric
- where pol. indicates that the molecule is polymeric
- and (5) water;
- (b) maintaining the reaction mixture under conditions sufficient to form crystals of the zeolite;
- and
- (c) recovering the crystals of the zeolite.
A zeolite having the MTT framework topology defined by the connectivity of the tetrahedral atoms in the zeolite and having a composition, as-synthesized and in the anhydrous state, in terms of mole ratios, is as follows:
- YO2/WcOd
- 15–∞
- Q/YO2
- 0.02–0.10
- M2/n/YO2
- 0.015–0.10
- wherein Y is silicon;
- W is aluminum, boron, gallium, indium, iron, titanium, vanadium or mixtures thereof;
- c is 1 or 2;
- d is 2 when c is 1 or d is 3 or 5 when c is 2;
- M is an alkali metal cation, alkaline earth metal cation or mixtures thereof;
- n is the valence of M;
- and Q is at least one nitrogen-containing organic compound selected from the group consisting of the following:
- where pol. indicates that the molecule is polymeric
- where pol. indicates that the molecule is polymeric
Dependencies are inferred from the claim text.