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Chitosan/shell powder composite microsphere load palladium catalyst, preparation method and application thereof

A technology of composite microspheres and palladium catalysts, applied in organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, organic chemical methods, etc. Poor stability and other problems, to achieve the effect of highlighting stability, improving complexation ability, high activity and stability

Inactive Publication Date: 2015-02-25
SHAOXING UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, chitosan microsphere-supported transition metal catalysts still have disadvantages such as easy loss of transition metals, poor catalyst stability, and easy breakage of microspheres.

Method used

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  • Chitosan/shell powder composite microsphere load palladium catalyst, preparation method and application thereof
  • Chitosan/shell powder composite microsphere load palladium catalyst, preparation method and application thereof
  • Chitosan/shell powder composite microsphere load palladium catalyst, preparation method and application thereof

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Embodiment 1

[0035] 1. Preparation of mixed solution: Take 5g of pharmaceutical grade chitosan powder (molecular weight: 100,000, degree of deacetylation: 95%), 0.3g of superfine pearl shell powder, dissolve in 100ml acetic acid solution with a mass fraction of 2% to make a mixed solution ; Under high-speed stirring, dropwise add glutaraldehyde aqueous solution with a mass fraction of 5% to the solution, control the degree of crosslinking to 0.3%, continue stirring for 2 hours to form a homogeneous solution, and let it stand for 12 hours for degassing.

[0036] 2. Preparation of chitosan / shell powder composite microspheres: drop the above-prepared solution into a NaOH coagulation bath (mass concentration is 5%), and the droplets gradually precipitate in the coagulation bath to form white microspheres; The white microspheres were washed with water until neutral and stored in ethanol.

[0037] 3. Preparation of chitosan / shell powder composite microsphere-supported palladium catalyst: weigh 0...

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Abstract

The invention discloses a chitosan / shell powder composite microsphere load palladium catalyst, a preparation method and an application thereof and belongs to the technical field of chemical catalyst preparation process. The chitosan / shell powder composite microsphere load palladium catalyst is characterized in that a catalyst carrier is a chitosan / shell powder composite microsphere, the active composition of the catalyst carrier is palladium, and the mass of the palladium is 0-0.1% of that of the carrier. When the chitosan / shell powder composite microsphere load palladium catalyst is applied to Heck reaction catalyzing, the chitosan / shell powder composite microsphere load palladium catalyst is high in activity and stability, over 95% coupled reaction yield can be achieved when the dosage of the catalyst is around 0.1mol% of substrate molecules, and the chitosan / shell powder composite microsphere load palladium catalyst still has good catalyzing efficiencies after the catalyst is used for 6 times.

Description

Technical field: [0001] The invention relates to a chitosan / shell powder composite microsphere-loaded palladium catalyst for catalyzing Heck coupling reaction, a preparation method and application thereof, and belongs to the technical field of chemical catalyst preparation technology. Background technique: [0002] Supported palladium catalysts can overcome the disadvantages of homogeneous palladium catalysts, such as difficult separation and recovery, severe palladium loss, and generation of palladium black pollution reaction products, which has become a hot spot in the theoretical research and industrial application of palladium catalysts. [0003] Chitosan-supported palladium catalyst supports are mainly in the following forms: powder, film, microsphere, and spun fiber. Among them, the microsphere form is considered to be the best form of catalyst support, mainly due to its easier separation and higher catalytic activity. [0004] In the Chinese invention patent 20101055...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/06B01J35/08C07B37/00C07C69/618C07C67/343C07C69/65C07C69/734
Inventor 齐陈泽曾敏峰
Owner SHAOXING UNIVERSITY
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