Metal-organic framework-based micro-membrane reactor, preparation method and application

A metal-organic framework and reactor technology, used in the preparation of organic compounds, chemical instruments and methods, preparation of aminohydroxy compounds, etc., can solve the problems of low loading, small active surface area, etc. Effects of mass and heat transfer processes

Pending Publication Date: 2020-01-03
HKUST SHENZHEN RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, low loading capacity and small active surface area are the main weaknesses of catalytic membrane materials

Method used

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  • Metal-organic framework-based micro-membrane reactor, preparation method and application
  • Metal-organic framework-based micro-membrane reactor, preparation method and application
  • Metal-organic framework-based micro-membrane reactor, preparation method and application

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preparation example Construction

[0034] The invention provides a preparation method of a metal-organic framework-based micro-membrane reactor, which comprises the following steps: preparing a fiber membrane substrate; growing a metal-organic framework membrane on the fiber membrane; and assembling the metal-organic framework membrane into the micro-membrane reactor.

[0035] The metal-organic framework film is prepared by in-situ growth method and secondary growth method, or the noble metal is doped in the metal-organic framework film by an improved secondary growth method. A metal-organic framework-based micro-membrane reactor with tight packaging is obtained by superimposing a cover plate with an inlet and an outlet with a metal-organic framework membrane, and then encapsulating it with polydimethylsiloxane. The rough surface and porous structure of the fibrous substrate can be regarded as microchannels for organic reactions. The fibrous substrate can simultaneously confine the metal-organic framework parti...

Embodiment 1

[0037] Example 1: Preparation of ZIF-8 metal-organic framework membrane on hydrophilic or hydrophobic glass fiber membrane (secondary growth method)

[0038] Place the glass fiber membrane substrate soaked in ethanol in 10 ml of seed crystal solution for 30 minutes at a temperature of 30 degrees. The molar ratio of the seed solution is 1Zn(NO 3 ) 2 ·6H 2 O:70~80 2-Methylimidazole: 5000~6000 water. Then the seeded substrate was washed with water three times, and added to 10 ml of fresh growth solution for 24 hours at 30°C. The molar ratio is 1Zn(NO 3 ) 2 ·6H 2 O:70~80 2-Methylimidazole: 5000~6000 water. Dried glass fiber membranes, without soaking in ethanol, were also treated with the above procedure. The glass fiber membrane was weighed before and after loading ZIF-8 to calculate the loading amount of ZIF-8. Figure 8A Demonstrated the loading of ZIF-8 on a hydrophobic glass fiber membrane; Figure 8B It is the loading of ZIF-8 on the hydrophilic glass fiber membran...

Embodiment 2

[0041] Embodiment 2: Long ZIF-8 metal-organic framework film (secondary growth method) on carbon cloth

[0042] Place the carbon soaked in ethanol in 10ml of seed solution for 30 minutes at a temperature of 30°C. The molar ratio of the seed solution is 1Zn(NO 3 ) 2 ·6H 2 O:70~80 2-Methylimidazole: 5000~6000 water. Then the seeded substrate was washed with water three times, and added to 10 ml of fresh growth solution for 24 hours at 30°C. The molar ratio is 1Zn(NO 3 ) 2 ·6H 2 O:70~80 2-Methylimidazole: 5000~6000 water. The carbon cloth is finally washed with methanol to remove deposits.

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Abstract

The invention discloses a method for preparing a metal-organic framework-based micro-membrane reactor, which includes the following steps: preparing a fiber membrane substrate; growing a metal-organicframework membrane on the fiber membrane; and assembling the fiber membrane having a metal-organic framework grown thereon to a micro-membrane reactor. Compared with a planar substrate, the fiber-based substrate provides larger surface area. Therefore, limiting or growing metal-organic framework nanoparticles to or on the fiber substrate can increase the surface area, thereby increasing the catalytically active sites. Further, the rough surface and the porous internal space of the fiber membrane can be regarded as microchannels, which promote the mass and heat transfer process of a catalyticreaction.

Description

technical field [0001] The invention relates to a metal-organic framework-based catalytic membrane reactor, including the preparation of the metal-organic framework membrane, the design and assembly of the microreactor, and its application in catalytic reactions. Background technique [0002] Metal-organic frameworks and noble metal-doped metal-organic frameworks are potential catalysts in organic reactions. The large-area metal-organic framework nanoparticles provide sufficient catalytically active sites. But in tank reactions, nanoparticle catalysts are difficult to separate and reuse; in fixed-bed reactions, they also bring high pressure drops. The catalytic membrane reactor integrating reaction and separation can increase the reaction conversion rate, improve selectivity, simplify product separation, and promote the process of continuous reaction. However, low loading capacity and small active surface area are the main weaknesses of catalytic membrane materials. Cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/00B01J19/24B01J19/32B01J31/22B01J31/28C07C255/41C07C253/30C07C215/76C07C213/02C07C43/307C07C41/56
CPCB01J19/0093B01J19/2475B01J19/32B01J31/1691B01J31/28B01J2231/341B01J2231/342B01J2231/641B01J2531/0213B01J2531/16B01J2531/26B01J2531/48B01J2531/842C07C41/56C07C213/02C07C253/30C07C255/41C07C215/76C07C43/307
Inventor 杨经伦何凯琳韩伟
Owner HKUST SHENZHEN RES INST
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