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Synergistic growth of self-supporting mesoporous metal-organic frameworks

A metal-organic framework, self-supporting technology, applied in separation methods, alkali metal compounds, chemical instruments and methods, etc., can solve the problems of reducing expected activity, inability to enter the active site of MOFs, hindering mass transfer movement, etc., to promote rapid The effect of carrying out and controlling the process is simple and easy to avoid and avoid damage

Active Publication Date: 2021-02-12
新疆中蓄电制氢设备制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the accumulation or aggregation of low-dimensional MOFs nanosheets and nanowires greatly reduces the expected activity.
Meanwhile, most MOFs only have a microporous structure, which hinders the mass transfer movement, making guest molecules unable to access the active sites within MOFs.

Method used

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  • Synergistic growth of self-supporting mesoporous metal-organic frameworks
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: A method for preparing a self-supporting mesoporous metal-organic framework material in which nanowires and nanosheets grow synergistically, the specific steps are as follows:

[0029] (1) Add 32mL of N,N-dimethylformamide (DMF), 2mL of ethanol and 2mL of deionized water into the lining of the reaction kettle. Add 0.75mmol terephthalic acid (BDC) into the above mixed solution, and disperse evenly.

[0030] (2) Add 0.45mmol NiCl to the above solution 2 .6H 2 O, 0.225mmol VCl 2 and 0.075 mmol FeCl 2 .4H 2 O. After uniform dispersion, quickly add 0.8 mL of triethylamine (TEA) as a binding agent between metal ions and organic ligands, stir until a uniform suspension is formed, add the growth substrate, and then sonicate it for 8 hours.

[0031] (3) The mixture containing the growth substrate obtained after ultrasonication was transferred to a high-pressure reactor, and reacted at 140° C. for 12 hours.

[0032] (4) Cool the product obtained after the reactio...

Embodiment 2

[0034] Example 2: A method for preparing a self-supporting mesoporous metal-organic framework material in which nanowires and nanosheets grow synergistically, the specific steps are as follows:

[0035] (1) Add 32mL of N,N-dimethylformamide (DMF), 2mL of ethanol and 2mL of deionized water into the lining of the reaction kettle. Add 0.75mmol terephthalic acid (BDC) into the above mixed solution, and disperse evenly.

[0036] (2) Add 0.506mmol NiCl to the above solution 2 .6H 2 O, 0.169 mmol VCl 2 and 0.075 mmol FeCl 2 .4H 2 O. After uniform dispersion, quickly add 0.8 mL of triethylamine (TEA) as a binding agent between metal ions and organic ligands, stir until a uniform suspension is formed, add the growth substrate, and then sonicate it for 8 hours.

[0037] (3) The mixture containing the growth substrate obtained after ultrasonication was transferred to a high-pressure reactor, and reacted at 140° C. for 12 hours.

[0038] (4) Cool the product obtained after the react...

Embodiment 3

[0039] Example 3: A method for preparing a self-supporting mesoporous metal-organic framework material in which nanowires and nanosheets grow synergistically, the specific steps are as follows:

[0040] (1) Add 32mL of N,N-dimethylformamide (DMF), 2mL of ethanol and 2mL of deionized water into the lining of the reaction kettle. Add 0.75mmol terephthalic acid (BDC) into the above mixed solution, and disperse evenly.

[0041] (2) Add 0.45mmol NiCl to the above solution 2 .6H 2 O, 0.225mmol VCl 2 and 0.075 mmol FeCl 2 .4H 2 O. After uniform dispersion, quickly add 0.8 mL of triethylamine (TEA) as a binding agent between metal ions and organic ligands, stir until a uniform suspension is formed, add the growth substrate, and then sonicate it for 8 hours.

[0042] (3) The mixture containing the growth substrate obtained after ultrasonication was transferred to a high-pressure reactor, and reacted at 140° C. for 24 hours.

[0043] (4) Cool the product obtained after the reaction ...

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Abstract

The invention relates to a preparation method of a self-supporting mesoporous metal-organic framework material co-grown with nanowires and nanosheets, which is prepared by adopting a two-step method: (1) ultrasonic nucleation; (2) hydrothermal or solvothermal growth. Take N,N-dimethylformamide, ethanol, and water respectively in the lining of the reaction kettle, and then ultrasonically disperse the organic ligands in the mixed solution, add different combinations of metal salts and stir to make them evenly dispersed, and then add Triethylamine is used as an acid binding agent, and after being mixed evenly, it is added to the growth substrate, and an ultrasonic nucleation reaction is carried out for a certain period of time. Then, it was transferred to an autoclave to continue the reaction. After being cooled to room temperature, washed and dried to obtain a self-supporting metal-organic framework material in which nanowires and nanosheets grow synergistically. The self-supporting metal-organic framework material prepared by the invention in which the nanowires and nanosheets grow together has a continuous mesoporous structure, and the catalytic activity is improved; at the same time, the nanowires and the nanosheets support each other, and the stability is improved.

Description

technical field [0001] The invention relates to a self-supporting mesoporous metal-organic framework material with synergistic growth of nanowires and nanosheets and a preparation method thereof. The metal-organic framework material obtained by this method forms a self-supporting structure from in-situ grown nanowires and nanosheets, and has a continuous mesoporous structure, stable structure, simple and easy preparation method, and is mainly used in catalytic materials, gas separation, gas adsorption etc. Background technique [0002] Metal Organic Frameworks (MOFs) is a compound with a periodic porous structure assembled from organic ligands and metal ions. It is a new type of material that has received increasing attention in recent years. At present, great progress has been made in the preparation of carbon-metal hybrid materials as electrocatalysts using MOFs as sacrificial templates or precursors, but little research has been done on the activity of MOFs themselves. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/28B01J20/22B01J20/30B01J20/32B01D53/02B01J3/04B82Y40/00
CPCB01D53/02B01J3/04B01J20/226B01J20/28007B01J20/28083B01J20/3078B01J20/3085B01J20/3204B01J2220/4806B01J2220/4812B82Y40/00
Inventor 贾希来许婕朱晓
Owner 新疆中蓄电制氢设备制造有限公司