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Supported carbon-coated bimetallic catalyst and application thereof

A bimetallic catalyst, supported technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, organic chemistry, etc., can solve the problem of easy loss of precious metals, loss of precious metals, irreversible deactivation of catalysts, etc. problems, to achieve the effect of improving catalytic activity and target product selectivity, good stability, and high target product selectivity

Pending Publication Date: 2022-04-12
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two major problems in the loss of precious metals: catalyst irreversible deactivation and precious metals remaining in the product
Although the process is mature, the three wastes are discharged and the product purity is low.
[0007] Catalytic hydrogenation of nitrobenzene to generate hydroxyaniline, and then Bamberger rearrangement reaction in acidic medium, one-step generation of p-aminophenol is a green and efficient synthesis process, but the disadvantage is that the selectivity of the target product p-aminophenol is low, and Hydrogenation catalyst (the main active component is Pt) in a strongly acidic reaction environment, the noble metal is easy to lose, resulting in catalyst deactivation

Method used

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  • Supported carbon-coated bimetallic catalyst and application thereof
  • Supported carbon-coated bimetallic catalyst and application thereof
  • Supported carbon-coated bimetallic catalyst and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Weigh 10g of commercially available 3%Pt-1%Ru / C, add it into 15ml of water and mix evenly, add 20g of 20wt% lactose aqueous solution and 5g of 10wt% hydroxyethyl cellulose aqueous solution in turn, soak at room temperature for 2h , vacuum-dried at 40°C for 20h to remove moisture, and then it was calcined at 400°C under nitrogen for 20h at high temperature; then, the temperature was lowered to 100°C and treated in air atmosphere for 10h to obtain a supported carbon-coated platinum- Ruthenium catalyst.

Embodiment 2

[0049] Weigh 10g commercially available 5%Pt-0.5%Au / TiO 2 , add it into 15ml of water and mix evenly, add 20g concentration of 20wt% glucose aqueous solution and 5g concentration of 20wt% hydroxyethyl cellulose aqueous solution, after soaking at room temperature for 2h, vacuum dry at 60°C for 10h, remove moisture, and then put it in High-temperature calcination at 900° C. for 2 h under hydrogen; then, the temperature was lowered to 180° C., and treated in an air atmosphere for another 4 h to obtain a supported carbon-encapsulated platinum-gold catalyst.

Embodiment 3

[0051] Weigh 10g of commercially available 0.5%Pt-1%Ag / diatomaceous earth, add it into 15ml of water and mix evenly, add 5g of 20wt% sucrose aqueous solution and 5g of 15wt% hydroxyethyl cellulose aqueous solution, soak at room temperature for 2h Afterwards, it was vacuum-dried at 20°C for 40 hours to remove moisture, and then it was roasted at 600°C for 4 hours in a vacuum state; then, the temperature was lowered to 150°C and treated in an air atmosphere for 6 hours to obtain a supported carbon package. Platinum-silver catalyst.

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Abstract

The invention discloses a preparation method of a supported carbon-coated bimetallic catalyst, which comprises the following steps: (1) weighing a supported bimetallic catalyst, uniformly mixing the supported bimetallic catalyst with water, adding an aqueous solution of a soluble saccharide carbon source compound and an aqueous solution of hydroxyethyl cellulose, dipping at room temperature for 0.5-10 hours, and carrying out vacuum drying until moisture is dried to obtain the supported bimetallic catalyst; a dried product is obtained; (2) carrying out high-temperature roasting on the dried product at 400-1000 DEG C in an inert atmosphere, a hydrogen atmosphere or a vacuum state for 2-20 hours to obtain a roasted product; and (3) reducing the temperature to 100-180 DEG C, and treating the roasted product in an air atmosphere for 4-10 hours to prepare the supported carbon-coated bimetallic catalyst. The catalyst prepared by the invention has a complete carbon layer wrapping metal active component with a proper structure and thickness, is used for preparing alkoxy substituted or phenolic hydroxyl substituted aniline compounds by hydrogenation rearrangement of nitrobenzene compounds, and has high stability and high target product selectivity.

Description

(1) Technical field [0001] The invention relates to a supported carbon-wrapped bimetallic catalyst and its application in the preparation of p-aminophenol by hydrogenation of nitrobenzene. (2) Background technology [0002] In the actual production process of high-end fine chemicals such as pharmaceuticals and electronic chemicals, it is often necessary to carry out catalytic hydrogenation reactions in strong acidic solvents, and the active metal components of the catalysts are prone to dissolution and loss in acidic environments. For example, supported noble metal catalysts have excellent hydrogenation performance and are widely used, but in a strongly acidic reaction environment, noble metals also lose. There are two major problems in the loss of precious metals: irreversible deactivation of the catalyst and residual precious metals in the product. [0003] The irreversible deactivation of the catalyst caused by the loss of noble metal makes it difficult to reuse the cata...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/46B01J23/52B01J23/50C07C213/00C07C215/76C07C217/84
Inventor 李小年张群峰卢春山丰枫许孝良王清涛吕井辉赵佳
Owner ZHEJIANG UNIV OF TECH
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