SSZ-91 catalyst

Patent metadata

Field	Value
Publication number	US-11679987-B2
Application number	US-202117317469-A
Country	US
Kind code	B2
Filing date	May 11, 2021
Priority date	Aug 27, 2015
Publication date	Jun 20, 2023
Grant date	Jun 20, 2023

Abstract

A family of new crystalline molecular sieves designated SSZ-91 is disclosed, as are methods for making SSZ-91 and uses for SSZ-91. 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 catalyst, suitable for use in hydrocarbon hydrocracking, dewaxing, and olefin isomerization reactions, and in the alkylation and isomerization of aromatic compounds, the catalyst comprising a molecular sieve belonging to the ZSM-48 family of zeolites, wherein the molecular sieve comprises:
at least 70% polytype 6 of the total ZSM-48-type material present in the product, and
an additional EUO-type 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, and

wherein, the catalyst comprises one or more modifying metals selected from Groups 8 to 10 metals of the Periodic Table, and is composited with one or more catalytically active or inactive materials, synthetic or naturally occurring molecular sieves, or inorganic materials selected from clays, silica, or metal oxides.

2. The catalyst 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 (b)

 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

(b) W = weak (>0 to ≤ 20);

M = medium (>20 to ≤ 40);

S = strong (>40 to ≤ 60);

VS = very strong (>60 to ≤ 100).

3. The catalyst of claim 1 , wherein the molecular sieve has a silicon oxide to aluminum oxide mole ratio of 40 to 220.

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

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

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

7. The catalyst of claim 1 , wherein the crystallites collectively have an average aspect ratio of between 1 and 5.

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

9. The catalyst of claim 1 , wherein the crystallites collectively have an average aspect ratio of between 1 and 3.

10. The catalyst of claim 1 , wherein the modifying metal comprises nickel, platinum, palladium, or a combination thereof.

11. A process for converting hydrocarbons, comprising contacting a hydrocarbonaceous feed under hydrocarbon converting conditions with the catalyst of claim 1 .

12. The catalyst of claim 1 , wherein the molecular sieve is prepared from a reaction mixture comprising 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 the reaction mixture is subjected to crystallization conditions sufficient to form crystals of the molecular sieve.

13. The catalyst of claim 1 , wherein the molecular sieve is prepared from a reaction mixture comprising, in terms of mole ratios, the following:

SiO 2 /Al 2 O 3
  50-220

M/SiO 2
0.05-1.0

Q/SiO 2
0.01-0.2

OH/SiO 2
0.05-0.4

H 2 O/SiO 2
   3-100

wherein M is selected from the group consisting of elements from Groups 1 and 2 of the Periodic Table; and Q is a hexamethonium cation.

14. The catalyst of claim 1 , wherein the molecular sieve is prepared from a reaction mixture comprising, in terms of mole ratios, the following:

SiO 2 /Al 2 O 3
  85-180

M/SiO 2
 0.1-0.8

Q/SiO 2
0.02-0.1

OH/SiO 2
0.10-0.3

H 2 O/SiO 2
 10-50

wherein M is selected from the group consisting of elements from Groups 1 and 2 of the Periodic Table; and Q is a hexamethonium cation.

15. The catalyst of claim 1 , wherein the molecular sieve is combined with a matrix material prior to loading with one or more Groups 8 to 10 metals.

Assignees

• Chevron Usa Inc

Inventors

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

Classifications

• B01J29/7246

  EUO-type, e.g. EU-1, TPZ-3 or ZSM-50 · CPC title

• B01J29/703

  MRE-type, e.g. ZSM-48 · 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

• B01J29/7461

  MRE-type, e.g. ZSM-48 · CPC title

• C01B39/46

  Other types characterised by their X-ray diffraction pattern and their defined composition {(C01B39/023, C01B39/026, C01B39/06 take precedence)} · CPC title