Synthesis of SFE framework type molecular sieves

Patent metadata

Field	Value
Publication number	US-10414663-B2
Application number	US-201815996610-A
Country	US
Kind code	B2
Filing date	Jun 4, 2018
Priority date	Jun 5, 2017
Publication date	Sep 17, 2019
Grant date	Sep 17, 2019

Abstract

A method is provided for synthesizing a molecular sieve of SFE framework type using a structure directed agent selected from one or more of 1,2,3,5-tetramethyl-1H-pyrazol-2-ium cations and 1,2,3,4-tetramethyl-1H-imidazol-3-ium cations.

First claim

The invention claimed is:

1. A method of synthesizing a molecular sieve of SFE framework type, the method comprising:
(a) preparing a reaction mixture comprising:
(1) a source of silicon oxide;
(2) a source of an oxide of a trivalent element (X);
(3) optionally, a source of a Group 1 or Group 2 metal (M);
(4) a structure directing agent (Q) comprising one or more of 1,2,3,5-tetramethyl-1H-pyrazol-2-ium cations and 1,2,3,4-tetramethyl-1H-imidazol-3-ium cations;
(5) hydroxide ions; and
(6) water; and

(b) subjecting the reaction mixture to crystallization conditions sufficient to form crystals of the molecular sieve.

2. The method of claim 1 , wherein the reaction mixture has a composition, in terms of molar ratios, as follows:

SiO 2 /X 2 O 3
5 to 400

M/SiO 2
0 to 0.50

Q/SiO 2
0.05 to 0.50

OH/SiO 2
0.10 to 0.50

H 2 O/SiO 2
10 to 60.

3. The method of claim 1 , wherein the reaction mixture has a composition, in terms of molar ratios, as follows:

SiO 2 /X 2 O 3
150 to 250

M/SiO 2
0.10 to 0.30

Q/SiO 2
0.10 to 0.30

OH/SiO 2
0.15 to 0.40

H 2 O/SiO 2
15 to 40.

4. The method of claim 1 , wherein the trivalent element X is selected from one or more of boron, aluminum, gallium, and iron.

5. The method of claim 1 , wherein the trivalent element X comprises boron.

6. The method of claim 1 , wherein the reaction mixture also contains seeds.

7. The method of claim 6 , wherein the reaction mixture comprises from 0.01 to 10,000 ppm by weight of seeds.

8. The method of claim 6 , wherein the seeds comprise a crystalline material of SFE framework type.

9. The method of claim 1 , wherein the crystallization conditions include a temperature of from 125° C. to 200° C.

10. A molecular sieve of SFE framework type and, in its as-synthesized form, comprising one or more of 1,2,3,5-tetramethyl-1H-pyrazol-2-ium cations and 1,2,3,4-tetramethyl-1H-imidazol-3-ium cations in its pores.

11. The molecular sieve of claim 10 , and having a SiO 2 /X 2 O 3 molar ratio of 20 to 300, wherein X is selected from one or more of boron, aluminum, gallium, and iron.

12. The molecular sieve of claim 11 , wherein X comprises boron.

Assignees

• Chevron Usa Inc

Inventors

• Xie Dan

Classifications

• B01J29/70

  of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65 · CPC title

• C01B39/12

  the replacing atoms being {at least} boron atoms · CPC title

• B01J37/0018

  Addition of a binding agent or of material, later completely removed among others as result of heat treatment, leaching or washing,(e.g. forming of pores; protective layer, desintegrating by heat) · CPC title

• B01J29/86

  Borosilicates; Aluminoborosilicates {(B01J29/005 takes precedence)} · CPC title

• B01J37/10

  in the presence of water, e.g. steam · CPC title