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A kind of maf-4 metal organic framework film and its application

A metal-organic framework, MAF-4 technology, applied in membrane technology, semi-permeable membrane separation, separation methods, etc., can solve the problems of the support body and the membrane layer are not tightly connected, the selectivity of the separation membrane is low, and the preparation process is simple. , The effect of good membrane separation performance and good application prospects

Inactive Publication Date: 2021-09-03
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims to solve the current H 2 / CO 2 The problem of low selectivity of the separation membrane and the loose connection between the support body and the membrane layer

Method used

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  • A kind of maf-4 metal organic framework film and its application
  • A kind of maf-4 metal organic framework film and its application
  • A kind of maf-4 metal organic framework film and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1 Preparation of zinc oxide support

[0036] Prepare 0.3 g of polyvinyl alcohol aqueous solution with a mass fraction of 3%: weigh 3.5 g of zinc oxide powder (purity 99.9%, particle size figure 2 (c) is the PXRD spectrum of the pressed ZnO support, image 3 (a) is the surface SEM image of the pressed ZnO support.

Embodiment 2

[0037] Example 2: Preparation of seeded support

[0038] A solution of 2-Hmim (2-methylimidazole, 22.7 g) in methanol (40 mL) was added to Zn(NO 3 ) 2 ·6H 2 O (1.1 g) in methanol (40 mL), stirred rapidly for 2 h to obtain MAF-4 powder suspension. After taking it out, it was washed with fresh methanol three times by centrifugation, and dried in vacuum for 12 h to obtain MAF-4 powder with a crystal diameter of about 150 nm. The MAF-4 powder (0.5 g) and water (2.0 g) were evenly mixed and uniformly coated on the surface of the zinc oxide support. in, figure 2 (d) is the PXRD spectrum of the seeded support, image 3 (a) is the SEM image of the surface of the seeded support.

Embodiment 3

[0039] Embodiment 3: the preparation of MAF-4 film

[0040] A solution of 2-Hmim (2.27 g) in water (20 mL) was added to Zn(NO 3 ) 2 ·6H 2 O (0.11 g) in aqueous solution (20mL), 2-Hmim and Zn(NO 3 ) 2 ·6H 2 The molar ratio of O is 5.7, water (40 ml) and Zn(NO 3 ) 2 ·6H 2 The molar ratio of O is 460. After continuing to stir rapidly for 30 min, pour into a 75 ml stainless steel reaction kettle with polytetrafluoroethylene lining, then fix the seeded zinc oxide support on a special tetrafluoro frame, slowly put it into the reaction kettle vertically, and React at room temperature for 6 h. After the membrane was taken out, it was washed three times with fresh methanol, immersed in methanol solution for 12 h, and then taken out and dried. figure 2 (e) is the PXRD spectrum of the synthesized MAF-4 film, image 3 (c) and image 3 (d) SEM images of the surface and cross-section of the synthesized film, respectively.

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Abstract

The invention discloses a MAF‑4 (SOD‑[Zn(mim) 2 ], Hmim=2‑methylimidazole) type metal organic framework membrane and its separation of H 2 / CO 2 in the application. The present invention uses porous zinc oxide as a support body, and adopts a simple secondary growth method to synthesize a continuous and dense MAF-4 film layer on the support body. Can be applied to H at different pressures and temperatures 2 / CO 2 separation. The preparation process of the MAF-4 type metal-organic framework membrane provided by the invention is simple, and for single-component H 2 / CO 2 H separated or mixed with other gas components 2 / CO 2 The separation shows good separation performance, good repeatability and stability, and has a good application prospect in the field of gas separation.

Description

technical field [0001] The invention belongs to the technical field of film preparation and application, and more particularly, relates to a MAF-4 metal organic framework film and its application. Background technique [0002] Compared with traditional industrial separation technologies, membrane separation technology has the advantages of low energy consumption, less pollution, easy to achieve continuous separation, easy coupling with other separation processes, mild conditions of use, and easy amplification. , metallurgy and other industrial fields are more and more widely used. The membrane separation process mainly includes microfiltration, ultrafiltration, reverse osmosis, nanofiltration, electrophoresis, gas separation and pervaporation. [0003] As an energy carrier with a wide range of sources and high energy density, hydrogen (H 2 ) has attracted widespread attention (Science, 2003, 300: 1127-1129). Currently, H 2 The production is mainly through the conversion ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/06B01D67/00B01D53/22
CPCB01D53/228B01D67/0006B01D71/06Y02C20/40
Inventor 张飞廖培钦张杰鹏
Owner SUN YAT SEN UNIV
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