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Method for preparing chitose magnetic microsphere metal palladium complex catalyst

A technology of chitosan and magnetic microspheres, which is applied in the field of preparation of chitosan magnetic microsphere metal palladium complex catalysts, can solve problems such as poor thermal stability, difficulty in separation, recovery and reuse, and difficulty in the final recovery of palladium. Easy biodegradation and simple post-processing effect

Inactive Publication Date: 2008-11-12
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Inorganic carrier supported palladium complex catalysts solve the problems of poor thermal stability of homogeneous palladium catalysts, difficulty in separation, recovery and reuse in the reaction system, but the final recovery of palladium in waste catalysts is still relatively difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The technological process and steps of the present embodiment are as follows:

[0020] (1) Preparation of chitosan magnetic microspheres: get 31.51g ferric chloride and be dissolved in 200ml deionized water to make ferric chloride solution, then 2.45g sodium sulfite is dissolved in 50ml deionized water to make sodium sulfite solution; Add the solution into the above-mentioned ferric chloride solution, stir under the protection of nitrogen inert gas, and keep it for 20 minutes; then add sodium hydroxide solution dropwise under high-speed stirring, and the sodium hydroxide solution is composed of 16g ​​sodium hydroxide plus 200ml deionized Prepared, high-speed stirring reaction for 2 hours; then add chitosan acetic acid solution dropwise, chitosan acetic acid solution is composed of 1g chitosan plus 50ml 2% acetic acid solution; high-speed stirring to make it react completely, after the reaction is completed , washed with deionized water until neutral to obtain black chit...

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Abstract

The invention discloses a making method of chitosan magnet-microball metal palladium complex catalyst, which comprises the following steps: (1) weighing certain quantity of ferric chloride solution through original reducing method; adding certain quantity of sodium sulfite solution; stirring protected by nitrogen; adding sodium hydroxide to react for 1-2h; adding acetic acid solution of chitose; stirring at high speed to finish reacting; obtaining black chitosan magnet-microball; (2) weighing quantitative chitosan magnet-microball in the flask; adding metal palladium salt and anhydrous alcohol; stirring; heating; refluxing to react 10h under 90-120 deg.c; washing through anhydrous alcohol; sucking; drying; obtaining the product.

Description

technical field [0001] The invention relates to a preparation method of chitosan magnetic microsphere metal palladium complex catalyst, which belongs to the technical field of chemical catalyst preparation technology. Background technique [0002] In many organic chemical reactions, metals or their salts are often used as catalysts, such as Heck, Susuki and other reactions. For a long time, people have been looking for an efficient, pollution-free, industrially applicable catalyst. Homogeneous catalysts of metals and their salts, such as metal palladium and its salts, are the earliest catalysts used in reactions such as Heck and Susuki. The earliest catalysts used were without ligands. Later, phosphine ligands were added to the catalysts, which greatly improved the reaction efficiency. Aryl chlorides, which were previously thought impossible, were successfully catalyzed in polar solvents. [0003] Although the homogeneous palladium catalyst is an effective catalyst, it is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/06B01J23/44
Inventor 张群飞杨黎明陈捷刘引烽吴在前曹芳琦戎亮
Owner SHANGHAI UNIV