Synthesis of aluminosilicate zeolites having the offretite structure

Patent metadata

Field	Value
Publication number	US-10407313-B2
Application number	US-201815895207-A
Country	US
Kind code	B2
Filing date	Feb 13, 2018
Priority date	Mar 31, 2017
Publication date	Sep 10, 2019
Grant date	Sep 10, 2019

Abstract

A method is provided for the synthesis of a zeolite of the offretite structure using cyclopropyltrimethylammonium cations as a structure directing agent.

First claim

The invention claimed is:

1. A method of preparing a zeolite of OFF framework type, the method comprising:
(a) preparing a reaction mixture comprising:
(1) a source of silicon oxide;
(2) a source of aluminum oxide;
(3) a source of a Group 1 or Group 2 metal (M);
(4) a structure directing agent (Q) comprising cyclopropyltrimethylammonium cations;
(5) a source of hydroxide ions; and
(6) water; and

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

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
10 to 100

M/SiO 2
0.10 to 0.60

Q/SiO 2
0.10 to 0.50

OH/SiO 2
0.30 to 1.00

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
20 to 80

M/SiO 2
0.20 to 0.50

Q/SiO 2
0.15 to 0.35

OH/SiO 2
0.40 to 0.70

H 2 O/SiO 2
15 to 40.

4. The method of claim 1 , wherein the Group 1 or Group 2 metal comprises potassium.

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

6. A zeolite of OFF framework type and, in its as-synthesized form, comprising cyclopropyltrimethylammonium cations in its pores.

7. The zeolite of claim 6 , and having a molar ratio of SiO 2 /Al 2 O 3 in a range of 5 to 20.

8. The zeolite of claim 6 , and having a molar ratio of SiO 2 /Al 2 O 3 in a range of 10 to 20.

Assignees

• Chevron Usa Inc

Inventors

• Xie Dan

Classifications

• C01B39/305

  using at least one organic template directing agent · CPC title

• B01J29/50

  of the erionite or offretite type, e.g. zeolite T, as exemplified by patent document US2950952 · CPC title

• B01J37/10

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

• C01B39/48 Primary

  using at least one organic template directing agent · 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