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Hollow porous polymer nanospheres composite material encapsulated by noble metal nanoparticles, and synthesis and application thereof

A technology of porous polymers and nanoparticles, applied in the fields of compounds of Group 5/15 elements of the periodic table, organic compounds/hydrides/coordination complex catalysts, metal/metal oxides/metal hydroxide catalysts, etc. Achieve the effects of controllable yolk-shell structure, simple synthesis route, and multiple cycles

Inactive Publication Date: 2019-12-20
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although many studies have demonstrated this solvent-induced change in the porosity of hypercrosslinked porous polymers, this feature of hypercrosslinked porous polymers is utilized to construct highly efficient yolk-shell structured catalysts for solvent-stimuli-responsive Sexual size-selective catalytic applications have not been reported so far

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  • Hollow porous polymer nanospheres composite material encapsulated by noble metal nanoparticles, and synthesis and application thereof
  • Hollow porous polymer nanospheres composite material encapsulated by noble metal nanoparticles, and synthesis and application thereof
  • Hollow porous polymer nanospheres composite material encapsulated by noble metal nanoparticles, and synthesis and application thereof

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preparation example Construction

[0060] The present invention relates to a synthesis method of a hollow porous polymer nanosphere composite material encapsulated by noble metal nanoparticles, comprising the following steps:

[0061] (1) Starting from polylactic acid (PLA) end-modified RAFT chain transfer agent (PLA-TC), styrene (St) is used as a monomer, and PLA-b- PS diblock copolymer, and the remaining part of unreacted St monomer; then under the catalysis of anhydrous ferric chloride, carbon tetrachloride as solvent, one-pot hypercrosslinking to form the final hollow porous polymer nanosphere Skeleton material.

[0062] (2) Pre-disperse the hollow porous polymer nanosphere skeleton material obtained above in DMF solvent, add the noble metal salt, stir at room temperature, wash, reduce, and finally obtain the hollow porous polymer nanosphere catalyst material encapsulated by noble metal nanoparticles ; Wherein, taking palladium nanoparticle encapsulation as an example, the hollow porous polymer nanosphere ...

Embodiment 1

[0073] (1) Synthesis of hollow porous polymer nanosphere framework materials

[0074] Add 400mg PLA-TC, 1.725mL St and 0.49mgAIBN to the reaction test tube, and react at 70°C for 24h after three times of deoxygenation by freeze-pump-thaw method. After the reaction, the reaction solution was naturally cooled to room temperature, directly dissolved in 50 mL of carbon tetrachloride solvent, 3.0 g of anhydrous ferric chloride was added as a catalyst, and reacted at 90° C. for 24 h. After the reaction, the reaction solution was naturally cooled to room temperature, and the obtained crude product was extracted repeatedly by Soxhlet extraction for 48 hours using ethanol / tetrahydrofuran (1:1) as a mixed solvent, and dried in vacuum at 60°C for 24 hours. The yield of the obtained hollow porous polymer nanosphere skeleton material can be calculated to be 1.5 g.

[0075] (2) Preparation of hollow porous polymer nanosphere catalyst material encapsulated by palladium nanoparticles

[007...

Embodiment 2

[0078] Hollow porous polymer nanosphere catalyst material encapsulated by palladium nanoparticles for hydrogenation of styrene

[0079] Taking the hydrogenation of styrene at room temperature as an example, the hollow porous polymer nanosphere catalyst (0.2mol% Pd) encapsulated by palladium nanoparticles was dispersed in 2.0mL ethanol solvent in a reaction flask, and 5.0mmol styrene substrate was added. After replacing the air, react at room temperature for a specified time under a hydrogen atmosphere of 1 atm. The yield of the product was calculated by NMR.

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Abstract

The invention discloses a synthesis method and size selective catalytic application of a hollow porous polymer nanosphere composite material encapsulated by noble metal nanoparticles. Firstly, a porous polymer nanosphere network material with a hollow structure is synthesized by a reversible addition-fracture chain transfer polymerization and friedel-crafts overcrosslinking one-pot reaction. Then,the material is used as a main carrier, various guest noble metal nanoparticles are encapsulated respectively into hollow cavities through an impregnation-reduction method, and the final hollow porous polymer nanosphere composite material encapsulated by the noble metal nanoparticles is formed. The synthesis method and size selective catalytic application of the hollow porous polymer nanosphere composite material encapsulated by the noble metal nanoparticles further focus on taking the hollow porous polymer nanosphere composite material encapsulated by palladium metal nanoparticles as a heterogeneous catalyst, and solvent polarity-induced catalytic hydrogenation application with adjustable size selectivity is provided.

Description

technical field [0001] The invention belongs to the technical field of polymer composite material synthesis, and relates to the technical field of hollow polymer-encapsulated noble metal nanoparticle catalysts, in particular to the synthesis of a hollow porous polymer nanosphere composite material encapsulated by noble metal nanoparticles and its excellent performance in different solvents. Application of sex-induced size selectivity in heterogeneous catalysis. Background technique [0002] In recent years, due to its unique physical and chemical properties, the development and application of yolk-shell (yolk-shell, that is, each shell cavity contains a flexible core) porous nanomaterials has attracted widespread attention from researchers. Especially in the field of catalysis, many porous materials, such as hollow silica, carbon materials, zeolites, and metal-organic frameworks (MOFs), have been used to build hollow nanoreactors with yolk-shell structures for special size s...

Claims

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Application Information

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IPC IPC(8): B01J31/06B01J23/44B01J35/10C07C5/03C07C9/15C07C209/36C07C211/46C07F9/50C07D209/86C07D213/38
CPCB01J31/06B01J23/44C07C5/03C07C209/36C07F9/5022C07F9/5054C07D209/86C07D213/38B01J2231/645B01J2231/641B01J35/398B01J35/61C07C9/15C07C211/46
Inventor 黄琨徐洋余海涛王华青
Owner EAST CHINA NORMAL UNIV
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