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Method for preparing nitrogen-doped active carbon from nitrogen-enriched biomass raw material

A biomass raw material, nitrogen doping technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of pore structure damage, small amount of nitrogen doping, no visible, etc., and achieve excellent electrochemical performance Effect

Inactive Publication Date: 2015-03-04
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the former has the following disadvantages: the post-treatment of nitrogen doping is easy to damage the formed pore structure, the introduction of nitrogen element is limited to the surface of the material, and the amount of nitrogen doping is small
[0005] At present, there are few reports on the preparation of nitrogen-doped activated carbon using livestock skin and cartilage as raw materials, and there are no published Chinese patents.

Method used

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  • Method for preparing nitrogen-doped active carbon from nitrogen-enriched biomass raw material
  • Method for preparing nitrogen-doped active carbon from nitrogen-enriched biomass raw material
  • Method for preparing nitrogen-doped active carbon from nitrogen-enriched biomass raw material

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Embodiment 1

[0026] Fresh pigskin was placed in 1 mol / L sodium bicarbonate solution, soaked at 37 °C for 10 h, and washed until neutral. Sonicate in absolute ethanol for 30 min, and then oven dry at 80 °C. The dried pigskin was placed in a tubular carbonization furnace, fed with high-purity nitrogen gas at a flow rate of 120ml / min, raised to 600°C for carbonization at a rate of 5°C / min, kept for 2 hours, and cooled to obtain a carbonized sample. Grind and sieve the carbonized sample to obtain 80-120 mesh carbon. Mix this charcoal with potassium hydroxide at a mass ratio of 1:4.5, add 50 ml of deionized water, heat and stir for one hour, then dry. The dried mixture was placed in the tube furnace again, and high-purity nitrogen gas was introduced at a flow rate of 200ml / min, and the temperature was raised to 600°C at a rate of 5°C / min, and activated for 3.5 hours. After cooling to room temperature, the sample was washed with dilute hydrochloric acid and deionized water until neutral, filte...

Embodiment 2

[0028]Fresh pigskin was placed in 1 mol / L sodium bicarbonate solution, soaked at 37 °C for 10 h, and washed until neutral. Sonicate in absolute ethanol for 30 min, and then oven dry at 80 °C. The dried pigskin was placed in a tubular carbonization furnace, fed with high-purity nitrogen gas at a flow rate of 120ml / min, raised to 600°C for carbonization at a rate of 5°C / min, held for 2 hours, and cooled to obtain a carbonized sample. Grind and sieve the carbonized sample to obtain 80-120 mesh carbon. Mix this charcoal with potassium hydroxide at a mass ratio of 1:4.5, add 50 ml of deionized water, heat and stir for one hour, then dry. The dried mixture was placed in the tube furnace again, and high-purity nitrogen gas was introduced at a flow rate of 200ml / min, and the temperature was raised to 800°C at a rate of 5°C / min, and the activation was maintained for 3.5 hours. After cooling to room temperature, the sample was washed with dilute hydrochloric acid and deionized water u...

Embodiment 3

[0030] Fresh pigskin was placed in 1 mol / L sodium bicarbonate solution, soaked at 37 °C for 10 h, and washed until neutral. Sonicate in absolute ethanol for 30 min, and then oven dry at 80 °C. The dried pigskin was placed in a tubular carbonization furnace, fed with high-purity nitrogen gas at a flow rate of 120ml / min, raised to 800°C for carbonization at a rate of 5°C / min, held for 2 hours, and cooled to obtain a carbonized sample. Grind and sieve the carbonized sample to obtain 80-120 mesh carbon. Mix this charcoal with potassium hydroxide at a mass ratio of 1:4.5, add 50 ml of deionized water, heat and stir for one hour, then dry. The dried mixture was placed in the tube furnace again, and high-purity nitrogen gas was introduced at a flow rate of 200ml / min, and the temperature was raised to 800°C at a rate of 5°C / min, and the activation was maintained for 3.5 hours. After cooling to room temperature, the sample was washed with dilute hydrochloric acid and deionized water ...

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Abstract

The invention relates to a method for preparing nitrogen-doped active carbon from a nitrogen-enriched biomass raw material, and belongs to the technical field of preparation of carbon materials. In the method, an active carbon material with relatively high nitrogen doping amount and a large specific surface area is prepared from the biomass raw material with rich nitrogen through carbonization and activation in an inert atmosphere. The method has the advantages as follows: the raw material is environment-friendly and renewable; the preparation process is simple; in-situ nitrogen doping can be achieved; the nitrogen doping amount and a pore structure can be controlled at the same time; a new way is provided for high-added value utilization of the nitrogen-enriched biomass raw material. The prepared nitrogen-doped active carbon can be used as an efficient electrode material, an absorbent material and a catalyst carrier and applied to the field of energy and environmental protection.

Description

technical field [0001] The present invention relates to a method for preparing nitrogen-doped activated carbon, more specifically to a method for obtaining activated carbon with high specific surface area and rich nitrogen content by using nitrogen-rich biomass raw materials through carbonization and activation process to control pore structure and surface chemistry, The invention belongs to the technical field of porous carbon material preparation. Background technique [0002] Activated carbon has the advantages of developed pore structure, high specific surface area, large pore volume, rich surface chemistry, wide source of raw materials, and low cost. It has been widely used in gas adsorption and separation, water purification, electrode materials and catalysts. The key to the application performance of activated carbon lies in its high specific surface area, suitable pore size distribution and appropriate surface chemical properties. These characteristics mainly depend...

Claims

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Application Information

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IPC IPC(8): C01B31/08C01B31/10C01B31/12C01B32/336
Inventor 杨儒王勇李敏赵子健
Owner BEIJING UNIV OF CHEM TECH
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