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Cross-linked polyvinyl alcohol-supported palladium nanocatalyst and its preparation and application

A cross-linked polyvinyl alcohol and polyvinyl alcohol technology, which is applied in the preparation of carbon-based compounds, organic compounds, physical/chemical process catalysts, etc., can solve problems such as high cost of use, difficult separation and recovery, and loss of metal palladium. Achieve the effect of prolonging the service life, high product yield and good effect

Inactive Publication Date: 2016-06-29
SHAOXING UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned problems, the present invention provides a cross-linked polyvinyl alcohol-supported palladium nano-catalyst and its preparation and application, to overcome the prior art, the palladium salt homogeneous catalyst applied to the Suzuki coupling reaction is not easy to separate and recover, metal The loss of palladium is serious, not only the use cost is high, but also unfavorable to the environment, so as to obtain a higher catalytic activity, a higher product yield obtained by catalyzing the Suzuki coupling reaction, which can be recycled and used many times, and is conducive to environmental protection. Cross-linked polyvinyl alcohol-supported palladium nanocatalyst with long service life

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  • Cross-linked polyvinyl alcohol-supported palladium nanocatalyst and its preparation and application

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Embodiment

[0036] The active ingredient of the cross-linked polyvinyl alcohol-supported palladium nanocatalyst provided by the embodiments of the present invention is palladium, the carrier is cross-linked polyvinyl alcohol, and palladium is a nanostructure, and at the same time, the palladium in the cross-linked polyvinyl alcohol-supported palladium nano-catalyst The relative content is 0.1×10 -6 mol / g~5×10 -6 mol / g, such as 0.1×10 -6 mol / g, 0.2×10 -6 mol / g, 0.5×10 -6 mol / g, 1.1×10 -6 mol / g, 2.7×10 -6 mol / g, 3.8×10 -6 mol / g, 4.9×10 -6 mol / g, 5×10 -6 mol / g etc.

[0037] Wherein, the carrier cross-linked polyvinyl alcohol is its own network formed after polyvinyl alcohol is cross-linked.

[0038]The embodiment of the present invention also provides a method for preparing a cross-linked polyvinyl alcohol-supported palladium nanocatalyst, which includes two steps: 1) Preparation of polyvinyl alcohol-palladium complex solution: add 5 g of polyvinyl alcohol with a degree of polymeriz...

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Abstract

The invention discloses a cross-linked polyvinyl alcohol supported palladium nano catalyst and its preparation and application. The carrier of the cross-linked polyvinyl alcohol supported palladium nano catalyst is cross-linked polyvinyl alcohol, and the active component is palladium. The product yield obtained by the Suzuki coupling reaction catalyzed by the alcohol-supported palladium nanocatalyst is high; at the same time, the cross-linked polyvinyl alcohol-supported palladium nanocatalyst can be recycled and used repeatedly, and since most of the solvent in the Suzuki coupling reaction is water, thus It is beneficial to protect the environment; in addition, palladium exists in the form of nanoparticles in the cross-linked polyvinyl alcohol supported palladium nanocatalyst, so that it can be uniformly dispersed, thereby enhancing the catalytic performance; moreover, the carrier of loaded palladium is cross-linked polyethylene Alcohol, the polymer forming the cross-linked polyvinyl alcohol has strong hydrophilicity, so it is more suitable for reacting in aqueous solution, forms a hydrogel in water, and has a good effect of binding palladium nanometers, thereby extending the cross-linked polyvinyl alcohol Service life of supported palladium nanocatalysts.

Description

technical field [0001] The invention relates to a catalyst and its preparation and application, in particular to a cross-linked polyvinyl alcohol supported palladium nanometer catalyst and its preparation and application. Background technique [0002] In transition metal-catalyzed aryl coupling reactions, the Pd(PPh 3 ) 4 Catalyzed cross-coupling reactions of arylboronic acids with bromine or iodoarenes are known as Suzuki aryl coupling reactions. This reaction has the advantages of mild reaction conditions, tolerance of a variety of active functional groups, little steric hindrance, high yield, and aryl boronic acid is economically available and insensitive to moisture, so it has become a universally applicable C-C bond coupling method. It is widely used in the fields of pharmaceuticals, electronics and advanced materials, and can synthesize complex organic molecules, so it is favored by organic and polymer synthesis workers. The selection of catalysts for Suzuki couplin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/06C07B37/00C07C1/32C07C15/14C07C41/30C07C43/205C07C45/68C07C49/784
Inventor 董坚詹侃郭力雯章郑成翁世梅蔡豪坤鹿萍
Owner SHAOXING UNIVERSITY
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