Metal organic framework glass membrane and preparation method thereof

Patent metadata

Field	Value
Publication number	US-12246291-B2
Application number	US-202017754349-A
Country	US
Kind code	B2
Filing date	Nov 30, 2020
Priority date	Sep 30, 2019
Publication date	Mar 11, 2025
Grant date	Mar 11, 2025

Abstract

A metal organic framework glass membrane and a preparation method thereof are provided. The preparation method includes a step of heating a crystalline metal organic framework material to the melting temperature at a rate of 1-15° C./min and then naturally cooling the crystalline metal organic framework material. The crystalline metal organic framework material contains a metal node and a ligand A. The metal node is a zinc ion and/or a cobalt ion and the ligand A is imidazole or phosphoric acid. The metal organic framework glass membrane has a wide range of membrane-forming conditions, and the material thereof can be melted without being decomposed within a control range to form a continuous glass layer with good repeatability.

First claim

The invention claimed is:

1. A preparation method of metal organic framework glass membrane, comprising:
forming a crystalline metal organic framework material;
heating the crystalline metal organic framework material to a temperature at or above a melting point thereof and below a decomposition temperature thereof at a rate of 1-15° C./min; and
cooling the heated crystalline metal organic framework material,
wherein the crystalline metal organic framework material comprises a metal node and a first ligand, the metal node is selected from a zinc ion, a cobalt ion, or a mixture thereof,
the first ligand is imidazole or phosphoric acid, and
the melting point is in a range of 370-600° C.

2. The method according to claim 1 , wherein the crystalline metal organic framework material comprises a second ligand selected from benzimidazole, 2-methylbenzimidazole, 5-methylbenzimidazole, 5,6-dimethylbenzimidazole, 5-chlorobenzimidazole, 5-hydroxybenzimidazole, and triazole.

3. The method according to claim 2 , wherein the second ligand is selected from benzimidazole, 5-methylbenzimidazole, and 5-chlorobenzimidazole.

4. The method according to claim 3 , wherein the first ligand is imidazole.

5. The method according to claim 1 , wherein the rate of heating is 8-10° C./min.

6. The method according to claim 1 , wherein the crystalline metal organic framework material is synthesized in a solution comprising zinc ions, cobalt ions, or a mixture thereof, the first ligand, the second ligand, and an organic solvent, wherein a molar ratio of the first ligand, the second ligand, and the organic solvent is 1:4.5-30:0-5:100-500, and
the organic solvent is selected from N,N-dimethylformamide, N,N-dimethylacetamide, water, methanol, ethanol, and a mixture thereof.

7. The method according to claim 1 , wherein the crystalline metal organic framework material is supported on a support having a pore diameter of 70 nm-1 μm.

8. The method according to claim 7 , wherein the support is made of a material selected from α-Al 2 O 3 , γ-Al 2 O 3 , TiO 2 , and stainless steel.

9. A metal organic framework glass membrane prepared using the method according to claim 1 .

Assignees

• Univ Ningbo

Inventors

• Li Yanshuo
• Jin Hua

Classifications

• B01D67/00411

  by sintering · CPC title

• B01D2323/12

  Specific ratios of components used · CPC title

• B01D71/06 Primary

  Organic material · CPC title

• B01D71/04 Primary

  Glass · CPC title

• B01D53/228

  characterised by specific membranes · CPC title