Small crystal SSZ-41, its synthesis and use

Patent metadata

Field	Value
Publication number	US-11547986-B2
Application number	US-202217693503-A
Country	US
Kind code	B2
Filing date	Mar 14, 2022
Priority date	Mar 15, 2021
Publication date	Jan 10, 2023
Grant date	Jan 10, 2023

Abstract

A method is disclosed for producing small crystal, high aluminum content zincoaluminosilicate crystalline materials having the SSZ-41 framework structure. The compositions made according to that method, as well as uses of the same, are also disclosed.

First claim

The invention claimed is:

1. A method of synthesizing a zincoaluminosilicate molecular sieve having the framework structure of SSZ-41, the method comprising:
(1) forming a reaction mixture comprising:
(a) a FAU framework type zeolite;
(b) a source of zinc;
(c) a structure directing agent (Q) comprising 1,1′-(1,4-butanediyl)bis[4-aza-1-azoniabicyclo[2.2.2]octane] dications;
(d) a source of lithium;
(e) a source of hydroxide ions;
(f) water; and
(g) seeds; and

(2) subjecting the reaction mixture to crystallization conditions sufficient to form crystals of the zincoaluminosilicate molecular sieve;

wherein the reaction mixture is free or essentially free of sodium.

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

SiO 2 /Al 2 O 3
 30 to <100

SiO 2 /ZnO
15 to 75

Q/SiO 2
0.10 to 0.50

Li/SiO 2
0.05 to 0.35

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 /Al 2 O 3
50 to 90

SiO 2 /ZnO
20 to 40

Q/SiO 2
0.15 to 0.40

Li/SiO 2
0.10 to 0.30

OH/SiO 2
0.15 to 0.40

H 2 O/SiO 2
 15 to 45.

4. The method of claim 1 , wherein the FAU framework type zeolite is zeolite Y.

5. The method of claim 1 , wherein the source of zinc comprises a zinc salt of organic or inorganic acid, a zinc-exchanged FAU framework type zeolite, or any combination thereof.

6. The method of claim 1 , wherein the source of lithium comprises lithium hydroxide, a lithium halide, or any combination thereof.

7. The method of claim 1 , wherein the seeds comprise a molecular sieve having the framework structure of SSZ-41.

8. The method of claim 1 , wherein the reaction mixture comprises from 0.1 to 20 wt. % of seeds relative to total weight of SiO 2 in the reaction mixture.

9. The method of claim 1 , wherein the crystallization conditions heating the reaction mixture under autogenous pressure at a temperature in a range of from 100° C. to 200° C. for a time of from 1 day to 14 days.

Assignees

• Chevron Usa Inc

Inventors

• Zones Stacey Ian
• Chen Cong-Yan

Classifications

• C01B39/06 Primary

  Preparation of isomorphous zeolites characterised by measures to replace the aluminium or silicon atoms in the lattice framework by atoms of other elements {, i.e. by direct or secondary synthesis} · CPC title

• C07C2529/04

  having base-exchange properties, e.g. crystalline zeolites, pillared clays · CPC title

• C01P2004/62

  Submicrometer sized, i.e. from 0.1-1 micrometer · CPC title

• C07C4/06

  Catalytic processes {(C07C4/025 takes precedence)} · CPC title

• B01J2229/18

  to introduce other elements into or onto the molecular sieve itself · CPC title