A kind of janus structure polymer-based nano metal catalyst and its preparation method and application

A technology of structural polymers and nano-metals, applied in catalyst activation/preparation, organic compound preparation, organic compound/hydride/coordination complex catalysts, etc. It can solve the chemical composition partition and precise control technology of microstructure needs to be further Improve and other problems, to achieve good emulsification effect, avoid loss, shorten the effect of preparation time

Active Publication Date: 2022-07-08
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Methods such as interface protection, microfluidic synthesis, self-assembly and seed emulsion polymerization can be used to prepare Janus materials, but the precise control technology of chemical composition partitioning and microstructure needs to be further improved

Method used

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  • A kind of janus structure polymer-based nano metal catalyst and its preparation method and application
  • A kind of janus structure polymer-based nano metal catalyst and its preparation method and application
  • A kind of janus structure polymer-based nano metal catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Weigh 0.13g sodium dodecyl sulfate, 125mL H 2 O in the reactor, mechanical stirring and dissolving at room temperature, add 10.42g styrene, 0.33g divinylbenzene simultaneously, continue to pass N 2 After 30 min, the temperature of the reaction system was raised to 80 °C, a mixture of 0.19 g potassium persulfate and 19 mL water was slowly added dropwise, and the polymerization was performed at a constant temperature for 10 h. After the reaction, after the reaction solution was lowered to room temperature, 60 mL of H was added. 2 O, 6.04g p-chloromethylstyrene, 0.12g divinylbenzene, continue to swell for 4h, then heat up to 60°C, and add dropwise 0.24g potassium persulfate, 0.18g NaHSO 3 with 15mL H 2 The mixed solution of 0, continuous reaction 5h obtains seed emulsion;

[0044] Weigh 10g of the above seed emulsion, 10g of H 2 O and 0.33g of sodium dodecyl sulfate were placed in the reactor, mechanically stirred until the sodium dodecyl sulfate was dissolved, then th...

Embodiment 2

[0047] Weigh 0.13g sodium dodecyl sulfate, 125mL H 2 O in the reactor, mechanical stirring and dissolving at room temperature, add 10.42g styrene, 0.33g divinylbenzene simultaneously, continue to pass N 2 After 30 min, the temperature of the reaction system was raised to 80 °C, a mixture of 0.19 g potassium persulfate and 19 mL water was slowly added dropwise, and the polymerization was performed at a constant temperature for 10 h. After the reaction, when the reaction solution was lowered to room temperature, 60 mL of H was added. 2 O, 6.04g p-chloromethylstyrene, 0.12g divinylbenzene, continue to swell for 4h, then heat up to 60°C, and add dropwise 0.24g potassium persulfate, 0.18g NaHSO 3 with 15mL H 2 The mixed solution of O is continuously reacted for 5h to obtain seed emulsion;

[0048] Weigh 20g above-mentioned seed emulsion, 20g H 2 O and 0.66g sodium dodecyl sulfate were placed in the reactor, mechanically stirred until the sodium dodecyl sulfate was dissolved, th...

Embodiment 3

[0050] Weigh 0.22g sodium dodecyl sulfate, 125mL H 2 O in the reactor, mechanical stirring and dissolving at room temperature, add 20.83g styrene, 0.33g divinylbenzene simultaneously, continue to pass N. 2 After 30 min, the temperature of the reaction system was raised to 80 °C, and a mixture of 0.4 g of potassium persulfate and 30 mL of water was slowly added dropwise, and the polymerization was carried out at a constant temperature for 12 h. After the reaction, when the reaction solution was lowered to room temperature, 100 mL of H was added. 2 O, 12.2g p-chloromethylstyrene, 0.25g divinylbenzene, continue to swell for 6h, then heat up to 60°C, and dropwise add 0.24g potassium persulfate, 0.18g NaHSO 3 with 15mLH 2 The mixed solution of O is continuously reacted for 8h to obtain seed emulsion;

[0051] Weigh 20g of the above seed emulsion, 40g of H 2 O and 1.32g sodium dodecyl sulfate were placed in the reactor, mechanically stirred until the sodium dodecyl sulfate was d...

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Abstract

The invention discloses a Janus structure polymer-based nano metal catalyst and a preparation method and application thereof. The invention utilizes the characteristics of strong designability of polymer nano particles to obtain a Janus structure polymer carrier through a seed emulsion polymerization method. After activation, impregnation and exchange of metal ions, and in-situ reduction of metal ions, nano-metals are immobilized on the surface of the Janus-structure polymer carrier to obtain a Janus-structure polymer-based nano-metal catalyst. The catalyst preparation method provided by the invention is simple and controllable. It has the feasibility of large-scale production; realizes the selective loading of precious metals on the carrier surface. The catalyst of the invention is used in heterogeneous reactions, and can not only stabilize the Pickering emulsion, but also have excellent catalysis and recycling effects.

Description

technical field [0001] The present invention relates to a Janus structure polymer-based nano metal catalyst and its preparation method and application. Background technique [0002] Precious metals are expensive and scarce in reserves, and are widely used in reactions such as hydrogenation / dehydrogenation, oxidation / reduction, and asymmetric synthesis due to their high catalytic activity and selectivity. Generally speaking, in order to improve the use efficiency of precious metals, they are usually supported on various functionalized materials (including polymers, metal oxides, zeolites, carbon materials, etc.) Compared with the homogeneous catalyst, the catalytic activity in the reaction needs to be further improved. [0003] As a new type of emulsification technology with nano-micron particles as stabilizers, Pickering emulsion has become a research hotspot in the fields of chemical industry, materials, food science, etc., and the research on using nano-micron particles a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/28B01J31/06B01J37/02B01J37/16B01J37/32C07C213/02C07C215/76C08F212/08C08F212/36C08F212/14
CPCB01J31/28B01J31/06B01J35/0013B01J35/006B01J37/0201B01J37/16B01J37/32C07C213/02C08F212/08B01J2231/641C07C215/76C08F212/36C08F212/18Y02P20/584
Inventor 王建黎周雪邹思远刘小波张浩
Owner ZHEJIANG UNIV OF TECH
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