Activated carbon with high specific surface area and preparation method of activated carbon

A high specific surface area, activated carbon technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of large energy input, uneven activation effect, low yield, etc., and achieve high degree of aromatization and low carbon content High, high yield effect

Inactive Publication Date: 2019-07-12
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When biomass is directly activated to prepare activated carbon, there are often problems such as low yield, large energy input, and uneven activation effect. Therefore, effective pretreatment of biomass to prepare precursors with high carbon content and fixed carbon content is the key A very important step in today's field of high-performance activated carbon preparation

Method used

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  • Activated carbon with high specific surface area and preparation method of activated carbon
  • Activated carbon with high specific surface area and preparation method of activated carbon

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preparation example Construction

[0021] Such as figure 1 Shown, the invention provides a kind of preparation method with the gac of high specific surface area, and this preparation method comprises the steps:

[0022] (a) Mix hot soluble carbon-rich residue and activator (such as sodium hydroxide, potassium hydroxide, sodium bicarbonate, potassium bicarbonate, ferric chloride, zinc chloride, phosphoric acid or sulfuric acid) at a ratio of 2:1 to 1:6 The mass ratio is fully mixed, placed in the reactor, heated and kept for 30min to 150min, and then cooled to room temperature to obtain the intermediate product. The entire heating, keeping and cooling process is carried out under an inert atmosphere such as a nitrogen atmosphere;

[0023] (b) After the intermediate product is pickled with hydrochloric acid with a concentration of 0.5mol / L to 6mol / L, it is washed with deionized water until neutral, and finally dried to obtain the activated carbon with a high specific surface area, wherein Hydrochloric acid pickl...

Embodiment 1

[0030] (a) Grind and mix the above-mentioned thermally soluble carbon-rich residue with sodium hydroxide at a mass ratio of 2:1, then place it in a reactor, raise the temperature from room temperature to 700°C at a heating rate of 5°C / min, and keep it warm Cool to room temperature after 30min to obtain intermediate product;

[0031] (b) After the intermediate product was pickled with hydrochloric acid with a concentration of 1 mol / L, it was washed with deionized water until neutral, and finally dried to obtain the activated carbon with a high specific surface area, which was designated as C-1.

[0032] Through the BET characterization of the C-1, its specific surface area is 987.4m 2 / g, the total pore volume is 0.4984cm 3 / g, the average pore diameter reaches 0.9165nm.

Embodiment 2

[0034] (a) Grind and mix the above-mentioned thermally soluble carbon-rich residue with sodium hydroxide at a mass ratio of 1:2, then place it in a reactor, raise the temperature from room temperature to 900°C at a rate of 10°C / min, and keep it warm Cool to room temperature after 60min to obtain intermediate product;

[0035] (b) After the intermediate product was pickled with hydrochloric acid with a concentration of 1 mol / L, it was washed with deionized water until neutral, and finally dried to obtain the activated carbon with a high specific surface area, which was designated as C-2.

[0036] By BET characterization of the C-2, its specific surface area is 713.4m 2 / g, the total pore volume is 1.3584cm 3 / g, the average pore diameter reaches 1.1753nm.

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Abstract

The invention belongs to the field of renewable utilization of biomass and particularly discloses activated carbon with a high specific surface area and a preparation method of the activated carbon. The preparation method comprises steps as follows: thermally-dissolved carbon-enriched residues and an activator are sufficiently mixed, heated in the inert atmosphere, kept at the temperature for a period of time, and cooled to the room temperature, and an intermediate product is obtained; the intermediate product is washed with deionized water to be neutral after being subjected to acid pickling,finally, drying is performed, and the activated carbon with the high specific surface area is prepared. The activated carbon is prepared through sufficient use of waste produced in the thermally-dissolved carbon-enriched treatment process of the biomass, a new way is provided for high value-added utilization of biomass wastes, defects of a thermal-dissolving and carbon-enriching technology are made up, and comprehensive utilization of various solid wastes in the thermal-dissolving and carbon-enriching technology is realized.

Description

technical field [0001] The invention belongs to the field of renewable utilization of biomass, and more specifically relates to an activated carbon with a high specific surface area and a preparation method thereof. Background technique [0002] Activated carbon is a kind of carbon-containing raw material such as wood, coal and petroleum coke, which is prepared by pyrolysis and activation. It has a developed pore structure, a large specific surface area, rich surface chemical groups and specific adsorption capacity. A collective term for stronger carbon materials. Activated carbon is widely used in petrochemical, food, medicine and even aerospace and other fields, and has become an important functional material for national economic development and national defense construction. In recent years, with the rapid development of environmental protection, new energy and other industries, the market demand for activated carbon has surged, and the production and export volume of a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/324C01B32/348C01B32/342
CPCC01B32/324C01B32/342C01B32/348
Inventor 李显胡振中涂正俊朱贤青吴超聂帅徐凯姚洪
Owner HUAZHONG UNIV OF SCI & TECH
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