Method for preparing aluminosilicate molecular sieves having the CHA framework type

Patent metadata

Field	Value
Publication number	US-9708192-B2
Application number	US-201414553672-A
Country	US
Kind code	B2
Filing date	Nov 25, 2014
Priority date	Nov 25, 2014
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

A method is disclosed for preparing pure phase aluminosilicate molecular sieves having the CHA framework type using a trimethylphenylammonium cation as a structure directing agent.

First claim

The invention claimed is:

1. A method for preparing an aluminosilicate molecular sieve having the CHA framework type, comprising:
(a) preparing a reaction mixture containing:
(1) a source of silicon;
(2) a source of aluminum;
(3) at least one source of an element selected from Groups 1 and 2 of the Periodic Table;
(4) hydroxide ions;
(5) trimethylphenylammonium cations; 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 molecular sieve is prepared from a reaction comprising, in terms of mole ratios, the following:

SiO 2 /Al 2 O 3
 5 to 350

M/SiO 2
0.01 to 0.80

Q/SiO 2
0.05 to 0.40

OH/SiO 2
0.15 to 1.00

H 2 O/SiO 2
 10 to 100

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

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

SiO 2 /Al 2 O 3
 8 to 50

M/SiO 2
0.20 to 0.60

Q/SiO 2
0.10 to 0.30

OH/SiO 2
0.25 to 0.80

H 2 O/SiO 2
15 to 50

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

4. The method of claim 1 , wherein the source of silicon and aluminum comprises zeolite Y.

5. The method of claim 1 , wherein step (a) is performed in the absence of seed crystals.

6. The method of claim 1 , wherein the molecular sieve has a composition, as-synthesized and in the anhydrous state, in terms of mole ratios, as follows:

SiO 2 /Al 2 O 3
  5 to 350

Q/SiO 2
0.015 to 0.15

M/SiO 2
0.010 to 0.20

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

7. The method of claim 1 , wherein the molecular sieve has a composition, as-synthesized and in the anhydrous state, in terms of mole ratios, as follows:

SiO 2 /Al 2 O 3
 8 to 50

Q/SiO 2
0.04 to 0.10

M/SiO 2
0.05 to 0.20

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

8. An aluminosilicate molecular sieve having the CHA framework type and having a composition, as-synthesized and in the anhydrous state, in terms of mole ratios, as follows:

SiO 2 /Al 2 O 3
  5 to 350

Q/SiO 2
0.015 to 0.15

M/SiO 2
0.010 to 0.20

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

9. The molecular sieve of claim 8 , wherein the molecular sieve has a composition, as-synthesized and in the anhydrous state, in terms of mole ratios, as follows:

SiO 2 /Al 2 O 3
 8 to 50

Q/SiO 2
0.04 to 0.10

M/SiO 2
 0.05 to 0.20.

Assignees

• Xie Dan
• Zones Stacey Ian
• Chevron Usa Inc

Inventors

• Xie Dan
• Zones Stacey Ian

Classifications

• B01J29/7015

  CHA-type, e.g. Chabazite, LZ-218 · CPC title

• C01B39/48 Primary

  using at least one organic template directing agent · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title

• C01P2004/03

  obtained by SEM · CPC title