Process for preparing MTT zeolites using N,N,N,N′,N′,N′-hexamethyl-propane-1,3-diammonium dication structure directing agent
AssigneeChevron U.S.A. Inc.
InventorAllen W. Burton, Jr.
Life of this patent
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Abstract
The present invention rebates 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 an N,N,N,N′,N′,N′-hexamethyl-propane-1,3-diammonium dication as a structure directing agent.
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 potassium oxide;
- (2) optionally, sources of an oxide selected from the oxides of aluminum, boron, iron, gallium, titanium, vanadium or mixtures thereof (3) sources of silicon oxide;
- (4) a structure directing agent comprising a N,N,N,N′,N′N′-hexamethyl-propane-1,3-diammonium dication (hereinafter also referred to as “SDA Q”) 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, as follows:
- YO2/WcOd
- 15~∞
- Q/YO2
- 0.02-0.10
- K/YO2
- 0.005-0.10
- 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;
- and Q is
- N, N, N,N′N′N′-Hexamethyl-propane-1,3-diammonium cation.
Dependencies are inferred from the claim text.