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Flower-shaped nitrogen-doped carbon-spinel type microspherical catalyst with high specific surface area as well as preparation method and application thereof

A high specific surface area, nitrogen-doped carbon technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of uneven dispersion of metal ion components, small specific surface area of ​​tricobalt tetroxide, The performance can not be achieved better and other problems, to achieve the effect of rich surface active sites, simple introduction method, improved catalytic performance and stability

Active Publication Date: 2019-09-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] A large number of studies have reported that cobalt tetroxide has high catalytic combustion activity for methane, but the specific surface area of ​​cobalt tetroxide prepared by traditional methods is usually small, generally 10-70m 2 g -1 , and there are disadvantages such as uneven dispersion of metal ion components and poor thermal stability, so that its performance cannot achieve better results

Method used

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  • Flower-shaped nitrogen-doped carbon-spinel type microspherical catalyst with high specific surface area as well as preparation method and application thereof
  • Flower-shaped nitrogen-doped carbon-spinel type microspherical catalyst with high specific surface area as well as preparation method and application thereof
  • Flower-shaped nitrogen-doped carbon-spinel type microspherical catalyst with high specific surface area as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0055] A preparation method with high specific surface area flower-shaped nitrogen-doped carbon-spinel microsphere catalyst, comprising the steps of:

[0056] (1) Preparation of dopamine-silica sphere particles with controllable particle size; mix 48mL absolute ethanol and 2.0mL ammonia water (25wt% by mass), then add 160mL deionized water, stir for 10min, and stir evenly; Then add 2.0mL tetraethyl silicate, continue to stir for 30min, stir evenly; finally add 1.0g dopamine hydrochloride, carry out stirring reaction at room temperature, the time of stirring reaction is 12h, the stirring rate of stirring reaction is 4000rpm; , and then the precipitate was washed and centrifuged three times with deionized water and absolute ethanol respectively, and the precipitate was dried in an oven at 80°C for 3 hours, and ground to obtain dopamine-silica sphere particles (1-4 μm);

[0057] (2) Preparation of nitrogen-doped carbon-silicon dioxide particles: calcining the dopamine-silicon dio...

Embodiment 2

[0063] A preparation method with high specific surface area flower-shaped nitrogen-doped carbon-spinel microsphere catalyst, comprising the steps of:

[0064] (1) Preparation of dopamine-silica sphere particles with controllable particle size; take 48mL of absolute ethanol and 2.0mL of ammonia water (20% by mass percentage) and mix, then add 160mL of deionized water, stir for 10min, and stir evenly; Then add 2.0mL tetraethyl silicate, continue to stir for 30min, stir evenly; finally add 2.0g dopamine hydrochloride, carry out stirring reaction at room temperature, the time of stirring reaction is 2h, the stirring rate of stirring reaction is 4000rpm; , and then the precipitate was washed and centrifuged three times with deionized water and absolute ethanol respectively, and the precipitate was dried in an oven at 80°C for 3 hours to obtain dopamine-silica sphere particles (particle size 1-4 μm);

[0065] (2) Preparation of nitrogen-doped silica microspheres: calcining the dopam...

Embodiment 3

[0069] A preparation method with high specific surface area flower-shaped nitrogen-doped carbon-spinel microsphere catalyst, comprising the steps of:

[0070] (1) Preparation of dopamine-silica sphere particles with controllable particle size; take 48mL of absolute ethanol and 2.0mL of ammonia water (5% concentration by mass) and mix evenly, then add 160mL of deionized water, stir for 10min, and stir evenly Then add 2.0mL tetraethyl silicate, continue to stir for 30min, stir evenly; finally add 1.0g dopamine hydrochloride, carry out stirring reaction at room temperature, the time of stirring reaction is 2h, the stirring speed of stirring reaction is 6000rpm; Precipitate, then wash the precipitate with deionized water and absolute ethanol, centrifuge three times, dry the precipitate in an oven at 80°C for 3 hours, and grind to obtain dopamine-silica sphere particles (particle size: 1-4 μm);

[0071] (2) Preparation of nitrogen-doped silica microspheres: calcining the dopamine-s...

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Abstract

The invention discloses a flower-shaped nitrogen-doped carbon-spinel type microspherical catalyst with high specific surface area as well as a preparation method and application thereof. The method comprises the steps of mixing ethanol, ammonia water, water, tetraethyl orthosilicate and dopamine hydrochloride uniformly, centrifuging, and calcining to obtain nitrogen-doped carbon-silica particles; adding the nitrogen-doped carbon-silica particles into water, mixing uniformly, adding nitrate, urea and sodium hydroxide, and mixing uniformly to obtain mixed liquid; heating, centrifuging, and calcining to obtain the flower-shaped nitrogen-doped carbon-spinel type microspherical catalyst with high specific surface area. According to the preparation method provided by the invention, the process is simple; dopamine hydrochloride is adopted as a carbon source, thereby enabling silica microspheres to have rich porous structures and high frame strength; nitrogen doping can change the electron distribution of carbonaceous materials, thereby providing possibility for diffusion of ions to micropores. The active substances of the catalyst are spinel type species, and no noble metal is used; the catalyst has the advantages of low preparation cost, large specific surface area, rich surface active sites, strong stability, high catalytic activity, and the like.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a flower-shaped nitrogen-doped carbon-spinel microsphere catalyst with high specific surface area and its preparation method and application. Background technique [0002] Carbon nanospheres are a new type of material that combines the advantages of carbon materials and spherical structures, and have broad application prospects. This unique structure endows it with characteristics such as large specific surface area, low density, adjustable porosity and internal porosity. Spherical carrier materials are prone to surface defects and facilitate electron transfer. The formed surface defects help to interact with reactant molecules, thereby promoting the adsorption and activation of molecules. Nitrogen doping can change the polarity of the carbon matrix, change the electron distribution of the carbonaceous material, and provide the possibility for ions to diffuse into ...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/08B01J35/10B01J37/03B01J37/10F23G7/07
CPCB01J27/24B01J37/082B01J37/10B01J37/031F23G7/07B01J35/615
Inventor 叶代启熊菊霞宋岭河
Owner SOUTH CHINA UNIV OF TECH
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