Supported metal-organic framework composite material, and preparation method and application thereof

A metal-organic framework and composite material technology, which is applied to the preparation technology of crystalline materials and their supported composite materials and the field of catalysis applications, can solve the problems of reducing the catalytic effect and agglomeration, and achieves the effects of good dispersibility and high catalytic activity.

Active Publication Date: 2016-11-09
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It is known that noble metal nanoparticles often face some problems in practical applications. They are often prone to agglomeration and reduce the catalytic effect.

Method used

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  • Supported metal-organic framework composite material, and preparation method and application thereof
  • Supported metal-organic framework composite material, and preparation method and application thereof
  • Supported metal-organic framework composite material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Accurately weigh 0.05mmol 3,5-di(2,5-dicarboxyphenyl)benzoic acid, 0.05mmol zinc nitrate, 5ml DMA, 5ml H 2 O, put into a stainless steel reaction kettle with Teflon lining, react at a constant temperature of 140°C for 72h, and then cool down to room temperature at a constant rate of 2-3°C / h to obtain a colorless and transparent bulk porous crystalline metal-organic framework material . Namely Zn-MOF. (The general chemical formula is: {[Zn 5 (ddcba) 2 ]} n , n is positive infinity, and n only represents the structural characteristics of crystalline materials constructed by the repeated appearance of the smallest unit, which is a general formula).

Embodiment 2

[0028] 1) The porous crystalline metal-organic framework material obtained in Example 1 is used as a carrier after being replaced by a solvent to remove guest molecules (guest molecules mainly refer to water molecules and DMA molecules introduced in the synthesis of crystalline materials. Since the material has a pore structure, Both will have certain residues in the channel). The replacement method is: soak the crystalline material sample in ethanol solution for 48 hours, replace the ethanol solution every 24 hours, and then dry it in vacuum at 80°C for 6 hours. Subsequently, 100 mg of the displaced crystalline material was added to 15 ml of deionized water, and then 0.5 ml of a 10 mg / L silver nitrate solution was added, and the above mixed system was shaken for 24 hours.

[0029] 2) Transfer the above mixed system to the quartz test tube of the photochemical reactor, under the condition of stirring, use a mercury lamp with a power of 300W to irradiate with ultraviolet light ...

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Abstract

The invention discloses a supported metal-organic framework composite material, and concretely discloses a noble-metal-loaded composite catalytic material based on a porous crystal metal organic framework material and application of the composite catalytic material to catalyze reduction of p-nitrophenol. A two-step synthesis method is employed and comprises firstly performing self-assembly on an organic ligand 3,5-di(2,5-dicarboxylphenyl)benzoic acid and zinc nitrate in a mixed solution of N,N-dimethylacetamide and water, so as to obtain a porous metal organic framework material, and enabling the matrix and holes of the metal organic framework material to be loaded with noble metal nanoparticles by utilizing a ultraviolet-light reduction technology, so as to finally obtain noble metal Ag nanoparticles which are uniformly distributed, uniform in size and has the diameter of 3-10 nm, wherein the loading amount of the noble metal is adjustable. The catalyst has stability and superior catalytic activity in catalyzing reduction of p-nitrophenol.

Description

technical field [0001] The invention belongs to the field of preparation technology and catalytic application of crystalline materials and their loaded composite materials, and specifically relates to the construction of a porous metal-organic framework material with five-valent carboxylic acid as an organic ligand and zinc nitrate and the material loaded with precious metals to form a composite Material for later application in the catalytic reduction of p-nitrophenol. Background technique [0002] Metal-organic frameworks (MOFs) are a new class of microporous crystalline materials based on the self-assembly of organic ligands and metal ions. Metal ions or metal clusters act as nodes, and organic ligands act as bridges, often forming long-range ordered crystalline materials with regular channels. Compared with traditional porous materials, it has many advantages such as: 1. Adjustable pore size 2. Large specific surface area 3. Diversified skeleton components 4. Pores can ...

Claims

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Application Information

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IPC IPC(8): B01J31/22C02F1/70C07C213/02C07C215/76
CPCB01J31/1691B01J31/223B01J35/006B01J35/0093B01J35/1057B01J35/1071B01J2231/64B01J2531/0238B01J2531/26C02F1/70C02F2101/38C07C213/02C07C215/76
Inventor 李东升伍学谦赵君吴亚盘张健张其春
Owner CHINA THREE GORGES UNIV
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