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Cross-linked polyvinyl alcohol supported palladium nano catalyst as well as preparation and application thereof

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

Inactive Publication Date: 2013-12-18
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

Method used

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  • Cross-linked polyvinyl alcohol supported palladium nano catalyst as well as preparation and application thereof
  • Cross-linked polyvinyl alcohol supported palladium nano catalyst as well as preparation and application thereof

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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 as well as preparation and application thereof. The carrier of the cross-linked polyvinyl alcohol supported palladium nano catalyst is cross-linked polyvinyl alcohol and the active ingredient of the catalyst is palladium, and the yield of the product obtained by catalyzing Suzuki coupling reaction by using the cross-linked polyvinyl alcohol supported palladium nano catalyst is high; the cross-linked polyvinyl alcohol supported palladium nano catalyst can be repeatedly recovered and utilized a plurality of times, and as most solvent in the Suzuki coupling reaction is water, which is advantageous for environmental protection; in addition, palladium exists in the cross-linked polyvinyl alcohol supported palladium nano catalyst in the form of nano particles, and can be evenly dispersed so as to enhance catalytic performance; furthermore, the carrier for immobilizing palladium is cross-linked polyvinyl alcohol, the macromolecules forming the cross-linked polyvinyl alcohol are high in hydrophily so that the cross-linked polyvinyl alcohol is more suitable for reacting in an aqueous solution to form hydrogel, and good in nano effect of constraining palladium; therefore, the service life of the cross-linked polyvinyl alcohol supported palladium nano catalyst is prolonged.

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 Applications(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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