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Method for constructing hierarchical-pore MOF (metal organic framework) by ligand selective retention

A technology of hierarchical pores and ligands, applied in the field of hierarchical porous MOFs, can solve the problems of poor stability of MOFs, and achieve significant catalytic effect, good acid-base stability, and enhanced Lewis acidity.

Active Publication Date: 2019-10-08
NANKAI UNIV
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Problems solved by technology

But the fact is that most MOFs are not stable, especially in water, or undergo changes in solvent polarity, acidity and alkalinity, and temperature

Method used

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  • Method for constructing hierarchical-pore MOF (metal organic framework) by ligand selective retention
  • Method for constructing hierarchical-pore MOF (metal organic framework) by ligand selective retention
  • Method for constructing hierarchical-pore MOF (metal organic framework) by ligand selective retention

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Embodiment Construction

[0023] The present invention relates to the preparation of hierarchically porous UiO-66 by ligand selective retention method. For the specific process, please refer to the attached figure 1 . The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] Preparation of HP-UiO-66-dhtz (BDC:dhtz=1:1): Take 4 mL of glacial acetic acid and 7 mL of DMF in a 20 mL glass bottle, and add 70 μL of zirconium n-propoxide into it. Stir evenly, put the glass vial in an oven at 130°C for two hours, and the solution turns from colorless to yellow. Weigh 36.5mg BDC and 36.5mg dhtz, add them to the above solution, put them into a horizontal shaker, and react at 240rpm, 25°C for 5-7 days until all the white powder in the bottle turns into yellow powder. Centrifuge and wash three times with ethanol. After drying the sample in N 2 Hierarchical UiO-66 was obtained by pyrolysis at 250℃ for 2h under atmosphere.

[0025] Preparation ...

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Abstract

The invention discloses a method for constructing a hierarchical-pore MOF (metal organic framework) by ligand selective retention and relates to the technical field of construction of hierarchical-pore metal organic frameworks. The method includes that an instable 3,6-dicarboxylic acid-1,2,4,5-dihydrotetrazine ligand and a stable terephthalic acid ligand are simultaneously introduced into a UiO-66framework; further, by high-temperature pyrolysis at 250 DEG C for two hours, the stable terephthalic acid ligand is kept for maintaining stability of the framework while the instable tetrazine ligand collapses to increase the pore diameter of the material. Original pores in a certain proportion are retained while the mesopore diameter of the constructed hierarchical-pore UiO-66 can be increasedto 2-15nm, and high acid-base stability is achieved. Zirconium nuclear unsaturated metal sites are increased during decomposition of the instable ligand, the large pore diameter is beneficial to a mass transfer process, and hierarchical-pore UiO-66 has an excellent catalytic effect on oxidative desulfurization of benzothiophene owing to the two advantages.

Description

technical field [0001] The present invention relates to the technical field of constructing hierarchical porous metal-organic frameworks, in particular to introducing stable ligands and unstable ligands into the MOF framework at the same time, and obtaining hierarchical porous MOF through further pyrolysis. The material has excellent catalytic benzo Oxidative desulfurization performance of thiophene. Background technique [0002] Metal-organic frameworks (Metal-Organic Frameworks, MOFs) are a class of crystalline porous framework materials with a periodic network structure formed by metal ions or metal clusters and organic ligands through coordination bonds. , adjustable structure and other characteristics, it has potential application prospects in gas adsorption and separation, catalysis, sensing and proton conduction. See: Nandasiri, M.I.; Jambovane, S.R.; McGrail, B.P.; Schaef, H.T.; S. B. Choi, E. Choi, A. Yazaydin, R.Q. Snurr, M.O'Keeffe, J.Kim, O.M. Yaghi, Science ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00B01J31/22
CPCB01J31/1691B01J31/2239B01J2531/48C08G83/008
Inventor 常泽孙小雯卜显和
Owner NANKAI UNIV
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