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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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  • Summary
  • 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-doped carbon materials prepared by the latter method often have low nitrogen content, and the types of nitrogen-containing functional groups are single, which cannot significantly improve the performance of carbon materials.

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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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Embodiment 1

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

[0031] Put the biomass raw material corncob in a blast drying oven, dry at a temperature of 100°C for at least 24 hours, crush and sieve, control the particle size to 200um, put the particles into the material boat, and place the material boat in the atmosphere furnace In the process, the furnace chamber is vacuumed, and nitrogen-containing carbides are obtained after high-temperature ammonification treatment in an ammonia atmosphere. The ammonia gas flow rate is 0.5L / min, and the temperature is programmed from room temperature to 800°C, and the treatment time is 2 hours. , the heating rate is 5°C / min; then the nitrogen-containing carbide is dispersed in a potassium ...

Embodiment 2

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

[0035] Put the biomass raw material coconut shell in a blast drying oven, dry at a temperature of 150°C for at least 24 hours, crush and sieve, control the particle size to 500um, put the particles into the material boat, and place the material boat in the atmosphere furnace In the process, vacuumize the furnace chamber and carry out high-temperature ammonification treatment in an ammonia atmosphere to obtain nitrogen-containing carbides. The flow rate of ammonia gas is 2L / min, and the temperature is programmed from room temperature to 700°C. The treatment time is 4 hours. The speed 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, the stirring time is 0.5 hours, and after drying Th...

Embodiment 3

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

[0038]Put the biomass raw bamboo leaves in a blast drying oven 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. Put the particles into the material boat, and place the material boat in the atmosphere furnace In the process, nitrogen-containing carbides were obtained after high-temperature ammonification treatment in an ammonia atmosphere. The nitrogen flow rate was 1.25L / min, and the temperature was programmed from room temperature to 500°C. The treatment time was 2 hours, and the heating rate was 4°C / min. ; Then disperse the nitrogen-containing carbide in a saturated potassium hydroxide solution with a concentration of 50%, 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-carb...

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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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