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Magnetic palladium composite catalyst, and preparation method and use thereof

A composite catalyst and magnetic technology, applied in organic chemistry methods, carbon-based compound preparation, chemical instruments and methods, etc., can solve the problems of low catalytic performance and recycling efficiency of materials, and achieve the effect of improving separation efficiency.

Inactive Publication Date: 2015-07-22
SUZHOU TOKIND CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem mainly solved by the present invention is to provide a kind of magnetic palladium composite catalyst and its preparation method and application, which solves the technical problem of low catalytic performance and recovery efficiency of materials when heterogeneous catalysts are used in existing coupling reactions

Method used

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  • Magnetic palladium composite catalyst, and preparation method and use thereof
  • Magnetic palladium composite catalyst, and preparation method and use thereof
  • Magnetic palladium composite catalyst, and preparation method and use thereof

Examples

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Embodiment 1

[0021] Provide a kind of magnetic palladium composite catalyst, described magnetic palladium composite catalyst is based on superparamagnetic Fe 3 o 4 SiO 2 nanospheres as a carrier, the Fe 3 o 4 SiO 2 The surface of nano microspheres is covalently modified to support amino Pd (II) particles, and the structural formula of the magnetic palladium composite catalyst is:

[0022] .

[0023] see figure 1 , provide a kind of preparation method of magnetic palladium composite catalyst, comprising the steps of:

[0024] (1) Nano Fe 3 o 4The preparation process

[0025] Under nitrogen protection, 2.5 g of ferrous chloride hydrate, 3.2 g of ferric chloride and 100 mL of deionized water were added to a 250 mL four-necked flask. Heat the reaction solution to 40 °C, add 10 g of ammonia water dropwise, keep stirring at this temperature for 30 minutes, raise the temperature to 80 °C, add 8.8 g of sodium citrate aqueous solution (dissolved in 50 mL of deionized water) and stir for...

Embodiment 2

[0033] The difference between this embodiment and specific example 1 is that the alkali used in step (1) is sodium hydroxide, potassium hydroxide, ammonia water and sodium ethoxide. Other steps and implementation methods are the same as the specific examples.

Embodiment 3

[0035] The difference between this embodiment and the specific example 1 or 2 is that the reaction temperature used in step (1) is 80-120°C. Other steps and implementation methods are the same as the specific examples.

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Abstract

The invention discloses a magnetic palladium composite catalyst, and a preparation method and a use thereof. The magnetic palladium composite catalyst adopts superparamagnetic Fe3O4@SiO2 microspheres as a carrier, the surface is covalently modified with supported amino Pd (II) particles, and the catalyst is obtained through the steps of sequentially preparing Fe3O4 nanoparticles, preparing core-shell structured magnetic nanometer microspheres Fe3O4@SiO2 and preparing a Fe3O4@SiO2 supported amino ligand. The magnetic amino palladium composite catalyst can be applied in a Suzuki reaction, can realize approaching equal conversion of halobenzene with an electron donating group or an electron withdrawing group, and has unobvious decreasing activity after the catalyst is continuously used 5 times due to no obvious decrease of the supported amount of an active ingredient.

Description

technical field [0001] The invention relates to a nanometer precious metal catalyst, in particular to a magnetic recyclable palladium composite catalyst and its preparation method and application, belonging to the technical field of precious metal catalysts in material science. Background technique [0002] Homogeneous noble metal catalysts have the advantages of high reactivity, strong controllability, and good catalytic selectivity. They are widely used in organic coupling reactions such as Suzuki and Heck reactions, but they are difficult to recycle, easy to deactivate, and easy to cause environmental pollution. Disadvantages such as pollution, this is an urgent problem to be solved in industrial production. It is a feasible way to use heterogeneous noble metal catalysts instead of homogeneous catalysts to achieve catalyst recovery, but how to improve the catalytic performance and recovery efficiency of heterogeneous catalysts is the key point. Magnetic nanoparticle cata...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/30B01J31/28C07C205/06C07C201/12C07C253/30C07C255/50C07C49/784C07C45/68C07C25/18C07C17/263C07C22/08C07C15/14C07C1/32C07C43/225C07C43/205C07C41/30C07C49/84C07C205/35C07C255/54C07C49/813C07C205/11C07B37/00
Inventor 魏开举崔杨任明秀
Owner SUZHOU TOKIND CHEM CO LTD
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