Nitrogen-doped mesoporous carbon supported platinum catalyst as well as preparation method and application thereof

A technology of nitrogen-doped mesoporous carbon and nitrogen-doped porous carbon, which is applied in the preparation of amino compounds, chemical instruments and methods, and the preparation of organic compounds, and can solve the problem of low catalytic activity and selectivity of catalysts and the loss of catalytically active substances , unable to meet the catalytic conditions and other problems, to achieve good catalytic activity and selectivity, ensure catalytic performance, and ensure the effect of reducing performance

Inactive Publication Date: 2021-10-19
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalyst prepared by the traditional simple impregnation method is prone to adverse results such as particle agglomeration and loss of catalytic active substances, and the catalytic activity and catalytic selectivity of the catalyst are low, which cannot meet the requirements of catalytic conditions.

Method used

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  • Nitrogen-doped mesoporous carbon supported platinum catalyst as well as preparation method and application thereof
  • Nitrogen-doped mesoporous carbon supported platinum catalyst as well as preparation method and application thereof
  • Nitrogen-doped mesoporous carbon supported platinum catalyst as well as preparation method and application thereof

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preparation example Construction

[0024] The invention provides a method for preparing a nitrogen-doped mesoporous carbon-supported platinum catalyst, comprising the following steps:

[0025] The magnesium source solution is mixed with the nitrogen source, and then evaporated and foamed sequentially to obtain a foam;

[0026] Sequentially crushing and calcining the foam to obtain a calcined material;

[0027] Pickling, washing and drying the calcined material in sequence to obtain a nitrogen-doped porous carbon material;

[0028] The nitrogen-doped porous carbon material is sequentially subjected to Pt loading and reduction treatment to obtain the nitrogen-doped mesoporous carbon-supported platinum catalyst.

[0029] In the present invention, unless otherwise specified, each component is a commercially available product well known to those skilled in the art.

[0030] In the invention, the magnesium source solution is mixed with the nitrogen source, followed by evaporation and foaming treatment in sequence t...

Embodiment 1

[0046] Dissolve 703.4g of magnesium citrate nonahydrate (100mmol) in 20mL of deionized water to obtain a magnesium citrate solution; mix and stir the resulting magnesium citrate solution with 1.2012g of urea (20mmol) for 10min and evaporate in a water bath at 90°C for 6 After removing most of the water for ~8 hours, heat it in an oven at 140°C for 4 hours to make it fully foamed to obtain a foam; after grinding the obtained foam, calcinate it at 700°C under a nitrogen atmosphere for 4 hours to obtain a calcined material ; Reflux the obtained calcined material with a 3mol / L hydrochloric acid solution at 85°C for 6 hours to remove MgO in the calcined material, wash the product with distilled water until neutral, and dry it in an oven at 100°C for 12 hours to obtain a nitrogen-doped porous carbon material;

[0047] 3g of nitrogen-doped porous carbon material, 0.06g of Pt aqueous solution (Pt mass concentration: 2%) and 20mL of deionized water were ultrasonically dissolved for 3 mi...

Embodiment 2

[0055] Dissolve 703.4g of magnesium citrate nonahydrate (100mmol) in 20mL of deionized water to obtain a magnesium citrate solution; mix and stir the resulting magnesium citrate solution with 1.2012g of urea (20mmol) for 10min and evaporate in a water bath at 70°C for 6 After ~8h to remove most of the water, heat it in an oven at 140°C for 4h to fully foam to obtain a foam; after grinding the obtained foam, calcinate at 900°C under a nitrogen atmosphere for 4h to obtain a calcined material ; Reflux the obtained calcined material with a 3mol / L hydrochloric acid solution at 85°C for 6 hours to remove MgO in the calcined material, wash the product with distilled water until neutral, and dry it in an oven at 100°C for 12 hours to obtain a nitrogen-doped porous carbon material;

[0056] 3g of nitrogen-doped porous carbon material, 0.06g of Pt aqueous solution (Pt mass concentration: 2%) and 20mL of deionized water were ultrasonically dissolved for 3 minutes to make them evenly disso...

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Abstract

The invention belongs to the technical field of catalysts, and particularly relates to a nitrogen-doped mesoporous carbon supported platinum catalyst as well as a preparation method and application thereof. The preparation method of the nitrogen-doped mesoporous carbon loaded platinum catalyst provided by the invention comprises the following steps of: mixing a magnesium source solution with a nitrogen source, and sequentially carrying out evaporation and foaming treatment to obtain a foaming body; sequentially crushing and calcining the foaming body to obtain a calcined material; sequentially acid-pickling, washing and drying the calcined material to obtain a nitrogen-doped porous carbon material; and sequentially carrying out Pt loading and reduction treatment on the nitrogen-doped porous carbon material to obtain the nitrogen-doped mesoporous carbon loaded platinum catalyst. Experimental data show that the nitrogen-doped mesoporous carbon supported platinum catalyst provided by the invention has a mesoporous structure, and when the used in a nitro compound hydrogenation reaction, the nitrogen-doped mesoporous carbon supported platinum catalyst is high in catalytic activity, high in chemical selectivity as high as 99.9%, high in catalytic selectivity and good in catalytic effect.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a nitrogen-doped mesoporous carbon-supported platinum catalyst and its preparation method and application. Background technique [0002] According to the definition of porous materials given by the International Union of Pure and Applied Chemistry (IUPAC), according to the size of their pore diameters, they can be divided into three categories: microporous materials (microporous materials) with a pore size less than 2nm; mesoporous materials The pore diameter of the material (mesoporous materials) is 2-50nm; the pore diameter of the macroporous materials (macroporous materials) is greater than 50nm. Mesoporous materials have the characteristics of extremely high specific surface area, regular and orderly pore structure, narrow pore size distribution, and continuously adjustable pore size, making it suitable for the adsorption and separation of macromolecules that are difficult ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10C07C209/36C07C211/52
CPCB01J27/24B01J35/1004C07C209/365C07C211/52
Inventor 邹秀晶李绍婷汪学广陈秀彬盛瑶尚兴付鲁雄刚丁伟中
Owner SHANGHAI UNIV
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