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Multi-shell MOF-polyCOF core-shell structure composite catalytic material and preparation method thereof

A core-shell structure and catalytic material technology, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, hydrolysis preparation, etc., can solve difficult adsorption substrates, restrict catalytic reactions, conversion rates and selection Low sex and other problems, to achieve the effect of improving activity

Pending Publication Date: 2022-04-12
杭州阿德旺斯材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, most MOFs are difficult to dissolve in water or have low dispersion in water, which restricts the development of catalytic reactions of such materials in aqueous media, and it is difficult to adsorb substrates, resulting in low conversion and selectivity.
However, polyCOFs have good stability and hydrophobicity in organic solvents, and can adsorb hydrophobic substrates. Therefore, we prepared a multi-shell MOF-polyCOF core-shell structure material to solve the problem that MOF is difficult to adsorb substrates.

Method used

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  • Multi-shell MOF-polyCOF core-shell structure composite catalytic material and preparation method thereof
  • Multi-shell MOF-polyCOF core-shell structure composite catalytic material and preparation method thereof
  • Multi-shell MOF-polyCOF core-shell structure composite catalytic material and preparation method thereof

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Effect test

Embodiment 1

[0031] (1) Using 2,5-diethoxyhydroquinone (DTH) dimer and PEG bridge (DTH-dimer-x, x = PEG molecular weight) as a monomer, pass PolyCOF obtained by interfacial polycondensation of 1,3,5-tris(4'-formylphenyl)benzene and dth-dimer x, specifically: add 0.0375 mmol of DTH-dimer-42 to a beaker, dissolve in 1.0 ml 1,4-dioxane solution to obtain solution 1; 0.025mmol of 1,3,5-tri(4'-formylphenyl)benzene and 0.525ml of CHCOOH solution in 3mL mesitylene Solution 2 was obtained; mixed solutions 1 and 2 were stirred at room temperature for 48 hours to obtain polyCOFs mother liquor.

[0032] (2) Coating the first MOF shell on the polyCOF, specifically: the polyCOF prepared in step 1 is used as the core to disperse the Fe(NO 3 ) 3 9H 2 In a mixed solution of O (0.40g, 1.0mmol), organic ligand (Formula 1) (0.11g, 0.66mmol) and 10mL of water, stir well for 5 minutes until uniform, then transfer to a polytetrafluoroethylene-lined reaction kettle , and then reacted at 180°C for 4 hours, wa...

Embodiment 2

[0051] (1) Using 2,5-diethoxyhydroquinone (DTH) dimer and PEG bridge (DTH-dimer-x, x = PEG molecular weight) as a monomer, pass PolyCOF obtained by interfacial polycondensation of 1,3,5-tris(4'-formylphenyl)benzene and dth-dimer x, specifically: add 0.0375 mmol of DTH-dimer-42 to a beaker, dissolve in 1.0 ml 1,4-dioxane solution to obtain solution 1; 0.025mmol of 1,3,5-tri(4'-formylphenyl)benzene and 0.525ml of CHCOOH solution in 3mL mesitylene solution 2; mixed solutions 1 and 2, stirred at room temperature for 48 hours, and obtained polyCOFs mother liquor

[0052] (2) Coating the first MOF shell on the polyCOF, specifically: dispersing the polyCOF prepared in step 1 as the core into Cr(NO 3 ) 3 9H 2 O (0.40g, 1.0mmol), organic ligand (Formula 2) (0.11g, 0.66mmol) and 10mL water mixed solution, stirred for 5 minutes until uniform, then transferred to a polytetrafluoroethylene-lined reactor, Then react at 180°C for 4 hours, wash twice with DMF and deionized water respectiv...

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Abstract

The invention discloses a multi-shell MOF (Metal Organic Framework)-polyCOF (PolyCOF) core-shell structure. According to the structure, a polyCOF core is coated with shell layer MOFs to form an amphipathic reaction interface, and the amphipathic COF has the characteristics of amphipathic performance, excellent coordination capability and facilitation of stability of metal particles. The invention also provides a synthesis method of the multi-shell MOF-polyCOF core-shell structure material, the obtained material has the characteristics of large specific surface area and wide pore size distribution, introduced hydrophilic groups such as hydroxyl, carboxyl and amino improve the dispersity of a catalyst in a reaction medium, sufficient contact between substrate molecules and the catalyst is facilitated, and the reaction efficiency is improved. 95.3% of substrate conversion rate and catalyst recycling stability can be obtained.

Description

technical field [0001] The invention belongs to the field of preparation and application of catalysis, and in particular relates to a synthesis method of a multi-shell MOF-polyCOF core-shell structure material and its application to the hydrolysis reaction of ester substances. Background technique [0002] Covalent organic frameworks (COFs) are a class of organic porous crystalline materials constructed by covalent bonds of light elements (C, O, N, F, B, etc.). They are composed of pure organic matter, so they are stable in organic solvents. Good sex and hydrophobicity, can better adsorb hydrophobic substrates. Covalent organic frameworks (COFs) are crystalline materials with regular structure, chemical stability, high porosity and tunable pore size. Separation and other fields have potential application value. A series of polyCOFs were prepared by introducing polymers containing building monomers, which possess the advantages of covalent organic framework materials (high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22B01J31/06C08G8/04C07C51/09C07C53/08C07C29/09C07C35/08
Inventor 禹杰
Owner 杭州阿德旺斯材料科技有限公司
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