UTSA-74: a metal organic framework with two accessible binding sites per metal center for gas separation and gas storage

Patent metadata

Field	Value
Publication number	US-10569252-B2
Application number	US-201715494449-A
Country	US
Kind code	B2
Filing date	Apr 22, 2017
Priority date	Apr 22, 2016
Publication date	Feb 25, 2020
Grant date	Feb 25, 2020

Abstract

A metal-organic framework (MOF) and uses thereof are provided herein, including an MOF comprising a repeat unit of the formula [Zn 2 (H 2 O)L.0.5H 2 O] n , wherein L is a ligand of the formula:

The MOFs provided herein may be used in the separation of two or more gaseous molecules from each other. In some embodiments, the gaseous molecules are carbon dioxide and acetylene.

First claim

What is claimed is:

1. A metal-organic framework comprising a repeating unit of the formula: [M 2 L] n , wherein: M is a divalent metal ion and L is a ligand of the formula:

comprising a rhombohedral unit cell of a: 22.9 ű5%, b: 22.9 ű5%, and c: 15.9 ű5%; or a hydrate thereof.

2. The metal-organic framework of claim 1 comprising a repeating unit of the formula: [M 2 L] n , wherein: M is a divalent metal ion and L is a ligand of the formula:

comprising a rhombohedral unit cell of a: 22.8 to 23.0 Å, b: 22.8 to 23.0 Å, and c: 15.8 to 16.0 Å; or a hydrate thereof.

3. The metal-organic framework of claim 1 , wherein M is Zn 2+ .

4. The metal-organic framework of claim 1 , wherein the metal-organic framework comprises a powder X-ray diffraction spectrum having a peak at 7.709° 2θ using CuKα radiation.

5. The metal-organic framework of claim 4 , wherein the powder X-ray diffraction spectrum further comprises peaks at 14.262 and 15.454° 2θ.

6. The metal-organic framework of claim 5 , wherein the powder X-ray diffraction pattern further comprises peaks at 7.117, 10.5, 11.981, 13.039, 13.373, 14.262, 15.454, 16.232, 16.711, 17.032, 18.427, 18.719, 19.599, 20.271, 20.49, 21.089, 21.464, 22.484, 22.794, 22.837, 23.076, 23.27, 24.096, 24.363, 25.054, 25.59, 26.25, 26.556, 26.933, 27.398, 27.656, 27.892, 28.055, 28.752, 28.787, 29.468, 29.57, 29.811, and 30.031° 2θ.

7. The metal-organic framework of claim 1 , wherein the rhombohedral unit cell is 22.917, 22.917, and 15.902; 22.956, 22.956, and 15.883; or 22.951, 22.951, and 15.897.

8. The metal-organic framework of claim 1 , wherein the metal-organic framework is a hydrate.

9. The metal-organic framework of claim 8 , wherein the metal-organic framework is a hemihydrate.

10. The metal-organic framework of claim 1 , wherein the metal-organic framework further comprises a water molecule in each repeating unit.

11. A method of separating two or more compounds using a metal organic framework comprising:
(A) obtaining a metal-organic framework of claim 1 ;
(B) combining the metal-organic framework with a mixture comprising a first compound and one or more second compounds; and
(C) separating the first compound from the one or more second compounds based upon their differential sorption rate within the metal-organic framework.

12. The method of claim 11 , wherein the first compound is acetylene.

13. The method of claim 11 , wherein the second compound is carbon dioxide.

Assignees

• Univ Texas
• East China Inst Technology

Inventors

• Chen Banglin
• Luo Feng

Classifications

• B01J20/3085

  Chemical treatments not covered by groups B01J20/3007 - B01J20/3078 · CPC title

• C07C65/05

  o-Hydroxy carboxylic acids · CPC title

• B01D2253/204

  Metal organic frameworks (MOF's) · CPC title

• B01D53/02

  by adsorption, e.g. preparative gas chromatography {(solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01)} · CPC title

• B01D2257/504

  Carbon dioxide · CPC title