Preparation method for synthesizing metal organic framework UiO-66 adsorbents by aid of mixed ligands

A technology of metal-organic frameworks and mixed ligands, applied in chemical instruments and methods, and other chemical processes, can solve the problems of not reaching the ideal hydrogen adsorption capacity, achieve good application prospects, simple preparation process and equipment, and good repeatability Effect

Inactive Publication Date: 2019-03-01
DALIAN UNIV OF TECH
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Problems solved by technology

In summary, the materials obtained by the current preparation methods of UiO-66 do not reach the ideal hydrogen adsorption capacity, and there is an urgent need in this field for a new preparation method of UiO-66 that does not change its chemical and hydrothermal stability.

Method used

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  • Preparation method for synthesizing metal organic framework UiO-66 adsorbents by aid of mixed ligands
  • Preparation method for synthesizing metal organic framework UiO-66 adsorbents by aid of mixed ligands
  • Preparation method for synthesizing metal organic framework UiO-66 adsorbents by aid of mixed ligands

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Embodiment 1

[0030] Weigh 0.35g of zirconium chloride and 2.70mL of acetic acid, and dissolve them completely in 27.30mL of N,N-dimethylformamide solvent to form solution A; weigh 0.30g of terephthalic acid, Diformic acid / terephthalic acid molar ratio is 4:6 Weigh a certain amount of 2-aminoterephthalic acid to make it completely dissolved in 30mL N,N-dimethylformamide to form solution B; put solution B in In a constant-speed water bath at room temperature, add solution A drop by drop at a constant speed to mix the two solutions evenly to obtain solution C. Transfer solution C to a stainless steel reaction kettle lined with polytetrafluoroethylene and crystallize at 150°C. 21 hours; the obtained product was washed, centrifuged, dried, and vacuum activated at 150° C. for 12 hours to obtain a mixed ligand UiO-66 adsorbent. The XRD of the adsorbent, N 2 Adsorption-desorption, pore size distribution, SEM, TGA analysis results are as follows: figure 1 , 2 , 3, 4, and 5.

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Abstract

The invention provides a preparation method for synthesizing metal organic framework UiO-66 adsorbents by the aid of mixed ligands. The preparation method includes mixing zirconium sources and regulators with one another and then dissolving the zirconium sources and the regulators in solvents to obtain solution A; uniformly dissolving 2-aminoterephthalic acid, terephthalic acid and solvents to obtain mixed ligand solution B; dropwise adding the solution A into the solution B at the constant speed to obtain solution C; injecting the solution C into reaction kettles with polytetrafluoroethylenelinings and carrying out crystallization at the temperatures of 100-160 DEG C for 18-24 h; carrying out reaction, and then carrying out treatment to obtain target products. As proved by XRD (X-ray diffraction) analysis, the obtained products are UiO-66 adsorbent materials. The preparation method for synthesizing the adsorbent materials has the advantages that the preparation method is simple; theUiO-66 adsorbents synthesized by the aid of the mixed ligands are excellent in chemical and thermal stability; the hydrogen adsorption capacity of the metal organic framework UiO-66 adsorbents can beimproved to a great extent, and effective treatment methods and research directions can be provided to hydrogen adsorption separation and storage.

Description

technical field [0001] The invention belongs to the technical field of metal-organic framework adsorption materials, and in particular relates to a method for preparing a metal-organic framework UiO-66 adsorbent synthesized by using mixed ligands. Background technique [0002] At present, the sustainable development of human society is facing the dual pressure of increasingly serious fossil energy depletion and environmental pollution. Hydrogen energy, as a renewable new energy source, provides a new solution to this problem, and the use of adsorption method for material adsorption Or storage has a long history, and the adsorbent is a key factor in the high-efficiency adsorption process. As a unique class of porous materials, metal-organic frameworks have been increasingly used in the fields of gas separation and gas adsorption due to their advantages such as high specific surface area, adjustable pore size, and various topological structures. They consist of organic ligand...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30
CPCB01J20/223
Inventor 鲁金明张雯刘毅杨建华张艳王金渠
Owner DALIAN UNIV OF TECH
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