Method of producing zeolite membrane complex and zeolite membrane complex

Patent metadata

Field	Value
Publication number	US-11400421-B2
Application number	US-202117444851-A
Country	US
Kind code	B2
Filing date	Aug 11, 2021
Priority date	Mar 25, 2019
Publication date	Aug 2, 2022
Grant date	Aug 2, 2022

Abstract

In production of a zeolite membrane complex, a starting material solution containing at least a structure-directing agent and FAU-type zeolite particles having an average particle diameter of 50 to 500 nm is prepared. Then, a support is immersed in the starting material solution to form a zeolite membrane on the support by hydrothermal synthesis, the zeolite membrane being composed of AFX-type zeolite. After that, the structure-directing agent in the zeolite membrane is removed.

First claim

The invention claimed is:

1. A method of producing a zeolite membrane complex, comprising:
a) preparing a starting material solution containing at least a structure-directing agent and FAU-type zeolite particles having an average particle diameter of 50 to 500 nm;
b) immersing a support in said starting material solution to form a zeolite membrane on said support by hydrothermal synthesis, said zeolite membrane being composed of AFX-type zeolite; and
c) removing said structure-directing agent in said zeolite membrane.

2. The method of producing a zeolite membrane complex according to claim 1 , further comprising
depositing seed crystals of AFX-type zeolite on said support before said operation b).

3. The method of producing a zeolite membrane complex according to claim 1 , wherein
said starting material solution in said operation a) further contains silicon source and alkali source.

4. The method of producing a zeolite membrane complex according to claim 1 , wherein
said FAU-type zeolite particles are composed of Y-type zeolite or X-type zeolite.

5. The method of producing a zeolite membrane complex according to claim 1 , wherein
the average particle diameter of said FAU-type zeolite particles is in a range of 100 to 400 nm.

6. The method of producing a zeolite membrane complex according to claim 1 , wherein
in volume-based particle diameter distribution of said starting material solution, (D90−D10)/D50 is 3 or less.

7. The method of producing a zeolite membrane complex according to claim 1 , wherein
said support is porous.

8. The method of producing a zeolite membrane complex according to claim 1 , wherein
said support is an alumina sintered compact, a mullite sintered compact, or a titania sintered compact.

9. A zeolite membrane complex, comprising:
a support; and
a zeolite membrane provided on said support, said zeolite membrane being composed of AFX-type zeolite, wherein
in a cross section of said zeolite membrane which is perpendicular to a surface thereof, maximum and minimum values of thickness of said zeolite membrane in an area with a width of 10 μm in a direction along said surface are represented as A and B, respectively, and an evaluation value obtained by ((A−B)/(A+B)) is 0.04 or more and 0.70 or less.

10. The zeolite membrane complex according to claim 9 , wherein
CF 4 gas permeance of said zeolite membrane complex is 10 nmol/m 2 ·s·Pa or less.

Assignees

• Ngk Insulators Ltd

Inventors

• Noda Kenichi
• Miyahara Makoto

Classifications

• B01D2323/24

  Use of template or surface directing agents [SDA] · CPC title

• Y02P20/151

  Reduction of greenhouse gas [GHG] emissions, e.g. CO2 · CPC title

• B01D53/228

  characterised by specific membranes · CPC title

• C01B39/48 Primary

  using at least one organic template directing agent · CPC title

• B01D69/02

  characterised by their properties · CPC title