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Preparation of magnetic core-shell conductive polymer loaded nanogold catalyst and application of magnetic core-shell conductive polymer loaded nanogold catalyst in p-nitrophenol hydrogenation

A conductive polymer, core-shell catalyst technology, applied in the preparation of organic compounds, organic compound/hydride/coordination complex catalysts, preparation of aminohydroxy compounds, etc., can solve the problem of poor stability of nano-gold catalysts, difficult to recycle, etc problem, to achieve the effect of excellent catalytic activity, easy separation and high catalytic activity

Active Publication Date: 2020-06-02
YANTAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a preparation of a magnetic core-shell conductive polymer-loaded nano-gold catalyst and its application in hydrogenation of p-nitrophenol, so as to solve the problem of poor stability and difficult recycling of the nano-gold catalyst

Method used

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  • Preparation of magnetic core-shell conductive polymer loaded nanogold catalyst and application of magnetic core-shell conductive polymer loaded nanogold catalyst in p-nitrophenol hydrogenation
  • Preparation of magnetic core-shell conductive polymer loaded nanogold catalyst and application of magnetic core-shell conductive polymer loaded nanogold catalyst in p-nitrophenol hydrogenation
  • Preparation of magnetic core-shell conductive polymer loaded nanogold catalyst and application of magnetic core-shell conductive polymer loaded nanogold catalyst in p-nitrophenol hydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: A magnetic Au@Fe 3 o 4 Preparation method of conductive polymer core-shell catalyst and its application in catalytic selective hydrogenation of p-nitrophenol

[0031] 1.8g FeCl 3 ·6H 2O was dissolved in 150ml of ethylene glycol and dissolved under magnetic stirring; 1.98g of sodium acetate was weighed and added to the above system, and magnetic stirring was continued until a homogeneous solution was obtained, then the solution was put into a hydrothermal synthesis kettle for 7 hours at 110°C. The resulting precipitate was subjected to magnetic separation, washed repeatedly with deionized water and absolute ethanol until the filtrate was colorless, and dried at 50°C under vacuum to constant weight (about 8 hours) to obtain a solid powder.

[0032] Grind the above solid powder and weigh 0.5g, add it to a mixed solution containing 100 ml hydrochloric acid (15 mmol / L) and 0.7 ml aniline monomer, then add 11 ml ammonium persulfate solution dropwise under mechan...

Embodiment 2

[0036] Example 2: A magnetic Au@Fe 3 o 4 Preparation method of conductive polymer core-shell catalyst and its application in catalytic selective hydrogenation of p-nitrophenol

[0037] The specific experimental steps are the same as in Example 1, only changing Au@Fe 3 o 4 The gold loading method of the conductive polymer core-shell catalyst, the gold precursor is changed into a chloroauric acid solution, and the gold is loaded using the conductive polymer in situ reduction method to obtain 0.1g Fe 3 o 4 Add 0.052ml of chloroauric acid solution (the concentration of chloroauric acid solution is 9.56mg / ml) and 10ml of deionized water to the conductive polymer core-shell carrier. Au@Fe was obtained after overnight stirring, magnetic separation, washing and drying 3 o 4 / Conductive polymer core-shell catalysts.

[0038] image 3 The catalyst prepared under the conditions of the examples is an activity diagram of the obtained circulating catalytic reaction product under th...

Embodiment 3

[0039] Example 3: A magnetic Au@Fe 3 o 4 Preparation method of conductive polymer core-shell catalyst and its application in catalytic selective hydrogenation of p-nitrophenol

[0040] 5.4g FeCl 3 ·6H 2 O was dissolved in 180ml of ethylene glycol and dissolved under magnetic stirring; 16.2g of sodium acetate was weighed and added to the above system, and magnetic stirring was continued until a uniform solution was obtained, then the solution was put into a hydrothermal synthesis kettle at 300°C for 10 hours. The obtained precipitate was subjected to magnetic separation, washed repeatedly with deionized water and absolute ethanol until the filtrate was colorless, and dried at 50°C under vacuum to constant weight (about 12h) to obtain a solid powder.

[0041] Grind the above solid powder and weigh 0.5g, add it to the mixed solution containing 100 ml hydrochloric acid (10 mmol / L) and 0.4 ml pyrrole monomer, then add 8.5 ml ammonium persulfate solution dropwise under mechanical...

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Abstract

The invention provides preparation of a magnetic core-shell conductive polymer loaded nanogold catalyst and application of the magnetic core-shell conductive polymer loaded nanogold catalyst in p-nitrophenol hydrogenation. The preparation method comprises the following steps of: preparing a Fe3O4 / conductive polymer core-shell material by an in-situ polymerization method, and pretreating the Fe3O4 / conductive polymer core-shell material; taking the pretreated composite material as a carrier of the nanogold catalyst, and stabilizing the nanogold particles by adopting a conductive polymer. The prepared nanogold catalyst has excellent catalytic activity when applied to a reaction for preparing p-aminophenol through catalytic hydrogenation of p-nitrophenol at room temperature, and the recyclingperformance of the catalyst is stable. The method is of great significance to catalyst preparation and synthesis. The series of catalysts can realize fine regulation and control of nano-surface gold species electrons and controllable synthesis of catalyst gold active sites, and the method is simple in synthesis and low in cost, and the catalyst is easy to separate, excellent in catalytic activityand recycling performance, thus being suitable for industrial production.

Description

technical field [0001] The invention relates to a preparation method of a magnetic core-shell conductive polymer-loaded nano-gold catalyst, and also relates to the application of the prepared catalyst in p-nitrophenol hydrogenation, belonging to the technical field of preparation and application of a loaded nano-gold catalyst. Background technique [0002] P-aminophenol is an important chemical and pharmaceutical intermediate, which can be used in antipyretic and analgesic drugs such as paracetamol, dyes, p-phenylenediamine rubber antioxidants, photographic developers, fungicides, plant growth regulators, petroleum And lubricating oil antioxidants and other fields. The synthesis methods of p-aminophenol include nitrobenzene electrochemical reduction method, nitrobenzene catalytic hydrogenation method, p-nitrophenol iron powder reduction method, p-nitrophenol catalytic hydrogenation method, etc. The production process of the electrochemical reduction method of nitrobenzene i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/28B01J31/06B01J35/00B01J35/02C07C213/02C07C215/76
CPCB01J31/28B01J31/06C07C213/02B01J2231/641B01J35/393B01J35/33B01J35/50C07C215/76Y02P20/584
Inventor 祁彩霞孙立波蒋麟张杰郑玉华张淼孙逊苏慧娟
Owner YANTAI UNIV
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