Molecular sieve SSZ-91

Patent metadata

Field	Value
Publication number	US-9802830-B2
Application number	US-201514837071-A
Country	US
Kind code	B2
Filing date	Aug 27, 2015
Priority date	Aug 27, 2015
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

A family of new crystalline molecular sieves designated SSZ-91 is disclosed. Molecular sieve SSZ-91 is structurally similar to sieves falling within the ZSM-48 family of molecular sieves, and is characterized as: (1) having a low degree of faulting, (2) a low aspect ratio that inhibits hydrocracking as compared to conventional ZSM-48 materials having an aspect ratio of greater than 8, and (3) is substantially phase pure.

First claim

What is claimed is:

1. A molecular sieve belonging to the ZSM-48 family of zeolites, wherein the molecular sieve comprises:
a silicon oxide to aluminum oxide mole ratio of 40 to 200,
at least 70% polytype 6 of the total ZSM-48 family material present in the product, and
an additional EUO framework molecular sieve phase in an amount of between 0 and 3.5 percent by weight of the total product; and
wherein the molecular sieve has a morphology characterized as polycrystalline aggregates comprising crystallites collectively having an average aspect ratio of between 1 and 8.

2. The molecular sieve of claim 1 , wherein the molecular sieve has, in its as-synthesized form, an X-ray diffraction pattern substantially as shown in the following Table:

2-Theta
d-spacing (nm)
Relative Intensity(*)

7.55 ± 0.20
1.170
W

8.71 ± 0.20
1.015
W

12.49 ± 0.20 
0.708
W

15.12 ± 0.20 
0.586
W

21.18 ± 0.20 
0.419
VS

22.82 ± 0.20 
0.390
VS

24.62 ± 0.20 
0.361
W

26.39 ± 0.20 
0.337
W

29.03 ± 0.20 
0.307
W

31.33 ± 0.20 
0.285
W

(*)Relative intensity scale in which the strongest line in the X-ray diffraction pattern is assigned a value of 100, wherein: W = weak (>0 to 20); M = medium (>20 to 40); S = strong (>40 to 60); VS = very strong (>60 to 100).

3. The molecular sieve of claim 1 , wherein the molecular sieve has a silicon oxide to aluminum oxide mole ratio of 70 to 160.

4. The molecular sieve of claim 3 , wherein the molecular sieve comprises at least 80% polytype 6 of the total ZSM-48 family material present in the product.

5. The molecular sieve of claim 3 , wherein the molecular sieve comprises at least 90% polytype 6 of the total ZSM-48 family material present in the product.

6. The molecular sieve of claim 3 , wherein the crystallites collectively have an average aspect ratio of between 1 and 5.

7. The molecular sieve of claim 3 , wherein the crystallites collectively have an average aspect ratio of between 1 and 3.

8. The molecular sieve of claim 3 , wherein the molecular sieve comprises between 0.1 and 2 wt. % EUO framework molecular sieve.

9. The molecular sieve of claim 3 , wherein the molecular sieve comprises between 0.1 and 1 wt. % EUO framework molecular sieve.

10. The molecular sieve of claim 3 , wherein the molecular sieve comprises between 0.1 and 2 wt. % EU-1.

11. The molecular sieve of claim 3 , wherein the molecular sieve comprises between 0.1 and 1 wt. % EU-1.

12. The molecular sieve of claim 1 , wherein the molecular sieve has a silicon oxide to aluminum oxide mole ratio of 80 to 140.

13. The molecular sieve of claim 12 , wherein the molecular sieve comprises at least 80% polytype 6 of the total ZSM-48 family material present in the product.

14. The molecular sieve of claim 12 , wherein the molecular sieve comprises at least 90% polytype 6 of the total ZSM-48 family material present in the product.

15. The molecular sieve of claim 12 , wherein the crystallites collectively have an average aspect ratio of between 1 and 5.

16. The molecular sieve of claim 12 , wherein the crystallites collectively have an average aspect ratio of between 1 and 3.

17. The molecular sieve of claim 12 , wherein the molecular sieve comprises between 0.1 and 2 wt. % EUO framework molecular sieve.

18. The molecular sieve of claim 12 , wherein the molecular sieve comprises between 0.1 and 1 wt. % EUO framework molecular sieve.

19. The molecular sieve of claim 12 , wherein the molecular sieve comprises between 0.1 and 2 wt. % EU-1.

20. The molecular sieve of claim 12 , wherein the molecular sieve comprises between 0.1 and 1 wt. % EU-1.

21. The molecular sieve of claim 1 , wherein the molecular sieve comprises at least 80% polytype 6 of the total ZSM-48 family material present in the product.

22. The molecular sieve of claim 1 , wherein the molecular sieve comprises at least 90% polytype 6 of the total ZSM-48 family material present in the product.

23. The molecular sieve of claim 1 , wherein the crystallites collectively have an average aspect ratio of between 1 and 5.

24. The molecular sieve of claim 1 , wherein the crystallites collectively have an average aspect ratio of between 1 and 3.

25. The molecular sieve of claim 1 , wherein the molecular sieve comprises between 0.1 and 2 wt. % EUO framework molecular sieve.

26. The molecular sieve of claim 1 , wherein the molecular sieve comprises between 0.1 and 1 wt. % EUO framework molecular sieve.

27. A method of preparing the molecular sieve of claim 1 , comprising:
(a) preparing a reaction mixture containing:
at least one source of silicon,
at least one source of aluminum,
at least one source of an element selected from Groups 1 and 2 of the Periodic Table,
hydroxide ions,
hexamethonium cations, and
water; and

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

28. The method of claim 27 , wherein the molecular sieve is SSZ-91 and has, in its as-synthesized form, the X-ray diffraction pattern substantially as shown in the following Table:

2-Theta
d-spacing (nm)
Relative Intensity(*)

7.55 ± 0.20
1.170
W

8.71 ± 0.20
1.015
W

12.49 ± 0.20 
0.708
W

15.12 ± 0.20 
0.586
W

21.18 ± 0.20 
0.419
VS

22.82 ± 0.20 
0.390
VS

Assignees

• Chevron Usa Inc

Inventors

• Ojo Adeola Florence
• Xie Dan
• Zhang Yihua
• Lei Guan-Dao

Classifications

• C01P2004/54

  Particles characterised by their aspect ratio, i.e. the ratio of sizes in the longest to the shortest dimension · CPC title

• C01B39/48

  using at least one organic template directing agent · CPC title

• C01B39/023 Primary

  Preparation of physical mixtures or intergrowth products of zeolites chosen from group C01B39/04 or two or more of groups C01B39/14 - C01B39/48 · CPC title

• B01J29/80

  Mixtures of different zeolites · CPC title

• B01J29/7034

  MTW-type, e.g. ZSM-12, NU-13, TPZ-12 or Theta-3 · CPC title