A kind of chitosan embedded palladium nanofiber catalyst and its preparation method and application

A chitosan nanometer and chitosan technology, which is applied in the field of chitosan-embedded palladium nanofiber catalyst and its preparation, can solve the problems of reducing the physical or chemical adsorption performance of a palladium catalytic center, affecting the catalytic performance, and palladium clustering. , to achieve high specific surface area, improve solubility, and improve solvent resistance.

Inactive Publication Date: 2020-10-20
SHAOXING UNIVERSITY
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Problems solved by technology

This type of catalyst can fully contact with the reaction substrate due to the support of the palladium catalytic center on the surface of the carrier, thereby maintaining good catalytic activity, but the reduction of palladium ions and harsh reaction conditions (such as high temperature) often reduce the support for palladium. The physical or chemical adsorption performance of the catalytic center leads to the clustering or even loss of palladium, which affects its catalytic performance

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  • A kind of chitosan embedded palladium nanofiber catalyst and its preparation method and application
  • A kind of chitosan embedded palladium nanofiber catalyst and its preparation method and application

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] The preparation method of chitosan-embedded palladium nanofiber membrane, taking 0.90g of chitosan with a molecular weight of 200,000 and 0.10g of sodium polyacrylate with a molecular weight of 4-5 million, dissolved in 24.0g of trifluoroacetic acid / acetic acid at 40°C In an aqueous solution, including 4.0 g of trifluoroacetic acid, 12 g of acetic acid, and 7 g of water, a uniform solution was obtained after stirring at 40°C. 25mgPdCl 2 and 18mgNaCl are dissolved in 1g of water to obtain red Na 2 PdCl 4 aqueous solution. Na 2 PdCl 4 Add the aqueous solution into the chitosan / sodium polyacrylate solution, and stir vigorously at 60° C. to obtain a mixed solution of palladium / chitosan / sodium polyacrylate.

[0020] Inject the spinning solution into a 20 mL syringe with a flat needle with an inner diameter of 0.51 mm, fix the syringe in the electrospinning appa...

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Abstract

The invention relates to a chitosan-embedded palladium nanofiber catalyst and its preparation method and application. The fiber diameter of the catalyst is 500nm-900nm, and the mass percentage of palladium is 0.5-3.0% of the carrier. The catalyst material manufacturing method adopts the following process steps: preparing palladium / chitosan / sodium polyacrylate solution; preparing the palladium / chitosan / sodium polyacrylate solution through electrospinning to obtain chitosan-embedded palladium nanofiber membrane; finally The chitosan-embedded palladium nanofiber membrane is subjected to a cross-linking reaction at 150-250 DEG C, and is reduced and activated with sodium borohydride. The chitosan embedded palladium catalyst prepared by the invention has high catalytic activity, convenient recovery and good repeatability, and is an excellent heterogeneous palladium catalyst.

Description

technical field [0001] The invention belongs to the technical field of chemical catalyst preparation technology, and in particular relates to a chitosan-embedded palladium nanofiber catalyst and a preparation method and application thereof. Background technique [0002] According to statistics, more than 90% of commercialized chemical and pharmaceutical products involve the use of catalysts. Heterogeneous palladium catalysts overcome the shortcomings of homogeneous palladium catalysts, such as difficult separation and recovery, and residual palladium-contaminated products. They are currently a hot spot in the research of palladium catalysts, and they also have great application potential in industry. Chitin is a natural polymer extracted from the shells of crustaceans such as shrimps, insects, and crabs. Its production in nature is second only to cellulose, and chitosan is the product of chitin deacetylation. Chitosan chains contain a large number of amino groups and hydrox...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/06B01J35/06B01J32/00C07C67/347C07C69/734
CPCB01J31/06B01J35/06B01J37/342B01J2231/4261C07C67/347C07C69/734
Inventor 邵林军邢桂英齐陈泽
Owner SHAOXING UNIVERSITY
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