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Preparation and purification method and application of metal organic frameworks immobilized with nano-platinum

A metal organic framework and purification method technology, applied in the field of preparation and purification of metal organic framework materials, can solve the problems of uneven distribution of nanoparticles, easy agglomeration of active components, poor recyclability, etc. Not easy to drain effect

Active Publication Date: 2018-09-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the technical problems such as complex and time-consuming preparation process of the existing nanoparticle@MOFs composite material, uneven distribution of nanoparticles, and easy agglomeration of active components after use, resulting in poor recyclability. Preparation and purification method of platinum metal-organic framework (Pt@Ce-BTC)

Method used

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  • Preparation and purification method and application of metal organic frameworks immobilized with nano-platinum
  • Preparation and purification method and application of metal organic frameworks immobilized with nano-platinum
  • Preparation and purification method and application of metal organic frameworks immobilized with nano-platinum

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Effect test

Embodiment 1

[0043] The preparation of the metal-organic framework material Ce-BTC, the specific steps are as follows:

[0044] Weigh 2.17g Ce(NO 3 ) 3 ·6H 2 O and 2.10 g of 1,3,5-trimesic acid were dissolved in a mixture of 50 ml of N,N-dimethylformamide and 10 ml of deionized water, and magnetically stirred at room temperature until the solution was clear to obtain a Ce-BTC precursor solution; then transfer the homogeneously dispersed Ce-BTC precursor solution to a 100ml polytetrafluoroethylene liner, seal the lid and put it into a stainless steel reaction kettle, and heat it up to 100°C in a constant temperature blast drying oven. 1°C / min, after 24 hours of continuous reaction, take out the reactor and let it cool down to room temperature; Methanol is replaced every 12 hours for 3 days; the impregnated product is dried in a vacuum oven at 150°C for 12 hours, and the obtained white powder is Ce-BTC with a specific surface area of ​​600-700m 2 / g.

[0045]The X-ray powder diffraction...

Embodiment 2

[0050] The preparation of the metal-organic framework material Pt@Ce-BTC immobilized with nano-platinum, the specific steps are as follows:

[0051] (1) Preparation of nano-platinum: take 0.05g H 2 PtCl 6 ·6H 2 O In a 100ml round bottom flask, add 20ml of ethylene glycol and 0.222g of polyvinylpyrrolidone (molecular weight: 58000); fix the round bottom flask in an oil bath, heat to 180°C, heat and reflux for 10min, then cool naturally to room temperature; add Acetone until the dark brown colloidal precipitate appears in the black solution, the dark brown colloidal precipitate solution is centrifuged, the supernatant is discarded, the obtained precipitate is washed twice with n-hexane and acetone, and finally dispersed in 18ml N,N-dimethyl In formamide, dark brown nano-platinum solution is obtained;

[0052] (2) Preparation of Pt@Ce-BTC: Weigh 2.17g Ce(NO 3 ) 3 ·6H 2 O and 2.10g of 1,3,5-trimesic acid were dissolved in a mixture of 50ml of N,N-dimethylformamide and 10ml o...

Embodiment 3

[0058] The preparation of the metal-organic framework material Ce-BTC, the specific steps are as follows:

[0059] Weigh 2.17g Ce(NO 3 ) 3 ·6H 2 O and 1.05g 1,3,5-trimesic acid were dissolved in 30ml deionized water and 30ml ethanol respectively, and stirred at room temperature until clarification, respectively, to obtain cerium nitrate solution and trimesic acid solution; Mix cerium solution and trimesic acid solution, transfer to 100ml polytetrafluoroethylene liner, seal the lid and put it into a stainless steel reaction kettle, heat up to 120°C in a constant temperature blast drying oven, with a heating rate of 1°C / min, after 12 hours of continuous reaction, take out the reactor and cool it down to room temperature naturally; the reaction product is separated by suction filtration, then washed with ethanol for 3 times, and then immersed in 100ml of acetone, and the acetone is replaced every 12 hours for 3 days; The product was dried in a vacuum oven at 150°C for 12 hour...

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Abstract

The invention discloses a preparation and purification method and application of metal organic frameworks immobilized with nano-platinum. The method comprises the steps that firstly, an alcohol reduction method is adopted, and with organic alcohol as a reducing agent, polyvinyl pyrrolidone as a protective agent and chloroplatinic acid as a platinum source, nano-platinum is prepared through heatingreflux; secondly, a solvothermal method is adopted, metal salt, organic ligands and nano-platinum react with one another in a solvent, and the metal organic frameworks immobilized with nano-platinumare obtained after purification treatment. Nano-platinum in a purified Pt@Ce-BTC composite material prepared by means of the method is uniform in size, good in dispersibility and not easy to agglomerate, and the high-efficiency fixation effect of nano-platinum is achieved; moreover, after a catalytic reaction, the active components of the material are not easily agglomerated or lost, the use stability is high, the problem of agglomeration of the active components after the use of catalysts is effectively solved, and the prepared purified Pt@Ce-BTC composite material has broad application prospects in the field of catalytic purification for volatile organic matter.

Description

technical field [0001] The invention relates to the field of functionalization of metal-organic framework materials, in particular to a method for preparing and purifying metal-organic framework materials immobilized with nano-platinum and its application. Background technique [0002] Metal organic frameworks (MOFs) are porous materials with a periodic multidimensional network structure formed by self-assembly of metal ion clusters and organic ligands. Due to the high specific surface area, tunable pore structure, and large porosity of MOFs, they show great application prospects in adsorption, gas storage, chemical separation, and drug delivery. In recent years, the application of MOFs in the field of catalysis has gradually become an emerging research hotspot, and has attracted widespread attention. [0003] However, previous studies have found that due to the lack of catalytic active sites in MOFs, the catalytic performance is often unsatisfactory in practical use. Ther...

Claims

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Application Information

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IPC IPC(8): B01J31/22B01D53/86B01D53/72
CPCB01D53/8668B01J31/1691B01J31/2239B01D2257/7027B01J2531/38B01J35/394B01J35/396B01J35/393B01D2253/204B01D2257/708B01J35/00B01J37/16B01J23/42B01J2531/0216B01J2231/70B01J35/23
Inventor 付名利贺辉叶代启朱雪晴吴军良林雪婷胡芸
Owner SOUTH CHINA UNIV OF TECH
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