Nitrogen-doped modified porous carbon with high specific surface area and preparation method thereof

A high specific surface area, nitrogen-doped technology, applied in the field of nanomaterials, can solve the problems of not being able to significantly improve the performance of carbon materials, the single type of nitrogen-containing functional groups, and not being suitable for practical applications, etc., to achieve large-scale mass production, wide pore size distribution, low cost effect

Inactive Publication Date: 2015-03-25
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these two methods have certain defects in practical application.
The former method is cumbersome and time-consuming, the process is complicated, and it is not suitable for practical application; the nitrogen-dope

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  • Nitrogen-doped modified porous carbon with high specific surface area and preparation method thereof
  • Nitrogen-doped modified porous carbon with high specific surface area and preparation method thereof
  • Nitrogen-doped modified porous carbon with high specific surface area and preparation method thereof

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[0029] Example 1

[0030] Such as figure 1 As shown, figure 1 It is a flow chart of the preparation method of high specific surface area nitrogen-doped modified porous carbon shown in the examples. A method for preparing nitrogen-doped modified porous carbon with high specific surface area includes the following steps:

[0031] Place the corncob as a raw material of biomass in a blast drying box, and dry it at a temperature of 100°C for at least 24 hours. After crushing and sieving, the particle size is controlled to 200um. The particles are placed in a feed boat, and the feed boat is placed in an atmosphere furnace. In the process, the furnace cavity is evacuated, and nitrogen-containing carbide is obtained after high-temperature ammoniating treatment in an ammonia atmosphere. The ammonia flow rate is 0.5L / min, the temperature is programmed from room temperature to 800°C, and the treatment time is 2 hours. , The heating rate is 5℃ / min; then the nitrogen-containing carbide is disp...

Example Embodiment

[0033] Example 2

[0034] A method for preparing doped porous carbon with high specific surface area and high nitrogen content includes the following steps:

[0035] Place the biomass raw coconut shell in a blast drying box and dry it at a temperature of 150°C for at least 24 hours. After crushing and sieving, the particle size is controlled to 500um. The particles are placed in a feed boat, and the feed boat is placed in an atmosphere furnace. In the process, the furnace cavity is evacuated and subjected to high-temperature ammoniating in an ammonia atmosphere to obtain nitrogen-containing carbides. The ammonia flow rate is 2L / min. The temperature is programmed from room temperature to 700°C, and the treatment time is 4 hours. The rate is 3°C / min; then the nitrogen-containing carbide is dispersed in a potassium hydroxide solution with a concentration of 60%, the mass mixing ratio of the potassium hydroxide solution and the carbide is 2:1, and the stirring time is 0.5 hours. After ...

Example Embodiment

[0036] Example 3

[0037] A method for preparing doped porous carbon with high specific surface area and high nitrogen content includes the following steps:

[0038] Place the biomass raw bamboo leaves in a blast drying box and dry them at a temperature of 120°C for at least 24 hours. After crushing and sieving, the particle size is controlled to 25um. The particles are placed in a feed boat, and the feed boat is placed in an atmosphere furnace. In the process, the nitrogen-containing carbide is obtained after high-temperature ammoniating treatment in an ammonia atmosphere. The nitrogen flow rate is 1.25L / min, the temperature is programmed from room temperature to 500℃, the treatment time is 2 hours, and the heating rate is 4℃ / min. ; Then disperse the nitrogen-containing carbide in a 50% potassium hydroxide saturated solution, the mass mixing ratio of the potassium hydroxide solution and the carbide is 3:1, the stirring time is 0.75 hours, and the alkali-carbon mixture is obtained ...

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Abstract

The invention discloses a method for preparing a nitrogen-doped modified porous carbon with high specific surface area. The method comprises the following steps: drying and crushing biomass raw materials to obtain granules, and performing high-temperature ammoniation on the granules under an ammonia atmosphere to obtain a nitrogen-containing carbide; then dispersing the nitrogen-containing carbide into an activating agent solution, stirring and drying to obtain an activating agent/carbon mixture; and performing high-temperature activation on the activating agent/carbon mixture under a nitrogen atmosphere, washing, filtering, drying, thus obtaining the nitrogen-doped modified porous carbon material with a high specific surface area. The specific surface area of the prepared carbon material is 2,000-3,500m<2>/g, the pore size of the material is 0.4-8nm, and the nitrogen content is 0.5-5%. The method is simple, effective and easy to operate, facilitates large-scale batch production, and is applicable to industrial production.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, in particular to a preparation method of nitrogen-doped modified porous carbon with high specific surface area. Background technique [0002] Porous carbon materials are a common class of materials in porous materials. They have the characteristics of large specific surface area and pore volume, easy-to-adjust pore structure, good electrical conductivity, and excellent chemical stability. The storage of energy gas, the adsorption and capture of acid gas, catalysis and electrochemistry have shown great application potential. [0003] Since Ryoo et al. (J. Phys. Chem. B, 1999, 103, 7743) first reported the work of synthesizing highly ordered carbon molecular sieves, great progress has been made in the synthesis and application of porous carbon materials. However, the surface properties of pure carbon materials are limited, which limits their practical applications in various fields to ...

Claims

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Application Information

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IPC IPC(8): C01B31/02
Inventor 张存满耿振周向阳王达斌胡振悦
Owner TONGJI UNIV
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