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Chitosan-based porous microsphere load palladium catalyst, preparation method and application thereof

A technology of porous microspheres and palladium catalysts, applied in the direction of organic chemical methods, chemical instruments and methods, and the preparation of organic compounds, can solve the problems of large amount of organic solvent usage, complicated process, and low porosity, and achieve the goal of using organic solvents less, the preparation process is simple, and the effect of reducing production cost

Inactive Publication Date: 2011-04-20
SHAOXING UNIVERSITY
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  • Claims
  • Application Information

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Problems solved by technology

The main disadvantages of this process are: the use of organic solvents is large, the cost is high, the process is more complicated, organic solvents remain in the microspheres, the porosity is not high, and the size of the obtained microspheres is small (often all below 100 μm)
The main advantage of this method is that less organic solvent is used, but special high-pressure equipment is required, and the porosity and pore size of the microspheres are uncontrollable

Method used

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  • Chitosan-based porous microsphere load palladium catalyst, preparation method and application thereof
  • Chitosan-based porous microsphere load palladium catalyst, preparation method and application thereof
  • Chitosan-based porous microsphere load palladium catalyst, preparation method and application thereof

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Embodiment Construction

[0031] Such as figure 1 Shown, the preparation method of chitosan-based porous microsphere supported palladium catalyst of the present invention may further comprise the steps:

[0032] 1, the preparation of mixed solution: get pharmaceutical grade chitosan powder (molecular weight 100,000, degree of deacetylation is 95%) and polyethylene glycol (molecular weight 20,000) each 5g, be dissolved in 2% 100ml acetic acid solution, be made into Chitosan content (by weight) is a mixed solution of 1-10%; under high-speed stirring, add 5% glutaraldehyde aqueous solution dropwise to the solution, the degree of cross-linking is 0.3%, continue to stir for 2 hours to form a homogeneous solution, let it stand Degassing for 12h.

[0033] 2, the preparation of chitosan porous microsphere: above-mentioned mixed solution is dripped in the NaOH coagulation bath (concentration is 5%), and droplet precipitates gradually in coagulation bath and forms white Semi-IPN microsphere; After washing the ...

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Abstract

The invention discloses a chitosan-based porous microsphere load palladium catalyst, a preparation method and application thereof, belonging to the technical field of chemical catalyst preparation technology. The catalyst is characterized in that a catalyst carrier is a chitosan-based porous microsphere of which the diameter is 0.5-3 mm, the aperture of the surface is 5-30 nm, and the internal aperture is 1-10 mu m; an active component is palladium which accounts for 1-5 wt% of the carrier. The chitosan-based porous microsphere load palladium catalyst is applied to catalysis Ullmann and Heck reaction, can greatly reduce operation steps, material consumption and the like in the industrial production of Ullmann and Heck reaction, is favourable for lowering production cost and is environmental friendly.

Description

Technical field: [0001] The invention relates to a preparation method of a palladium catalyst supported by chitosan-based porous microspheres for catalyzing Ullmann and Heck coupling reactions, 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. Chitin is the second largest natural polymer material next to cellulose in nature, with abundant sources. Chitosan is the deacetylation product of chitin, and its chemical name is (1,4)-2-amino-2- Deoxy-β-D-glucose is non-toxic, harmless and easy to degrade. It has its own advantages as a polymer carrier: insoluble in common solvents, suitable for ...

Claims

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Application Information

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IPC IPC(8): B01J31/06B01J35/10C07B37/00C07C15/14C07C1/26C07C69/618C07C67/343
Inventor 齐陈泽曾敏峰张鑫邵林军
Owner SHAOXING UNIVERSITY
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