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Method for preparing porous carbon by stepwise activation of biomass

A technology of biomass and porous carbon, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of difficult wide application, corrosion of activator equipment, large amount of addition, etc., to improve utilization rate and solve corrosive harm, the effect of reducing the amount of addition

Active Publication Date: 2019-01-18
HUAZHONG UNIV OF SCI & TECH
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  • Claims
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Problems solved by technology

[0003] Currently, KOH, K 2 CO 3 , ZnCl 2 、H 3 PO 4 、KHCO 3 etc. are commonly used activators for the preparation of porous carbon materials. Although they can etch biochar to form a developed pore structure, they are added in a large amount during the activation process, usually 1-4 times the mass of biomass. A large amount of activators It will cause serious corrosion to the equipment, making it difficult to be widely used

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  • Method for preparing porous carbon by stepwise activation of biomass

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Embodiment 1

[0046] The embodiment of the present invention describes a method for preparing porous carbon by step-by-step activation of biomass. The method specifically includes the following steps:

[0047] S1: crush and sieve the bamboo chips to less than 60 meshes, put them in an oven at 105°C for 24 hours, and obtain the activated raw materials;

[0048] S2: The bamboo chips and KOH activator in step S1 are mixed thoroughly by dipping for 24 hours at a mass ratio of 20:1, and then evaporated at 60°C to remove water, then placed in an oven at 105°C for 24 hours to obtain a uniform mixture biomass samples;

[0049] S3: Use a fixed-bed reactor with a diameter of 45mm and a length of 60mm for activation treatment. After the reactor is heated to an activation temperature of 800°C, ~2g of the uniformly mixed biomass sample in step S2 is quickly sent to the middle of the reactor. The activation time is 60min to make the biomass react with the activator, and the argon flow rate is 200mL / min;...

Embodiment 2

[0055] This embodiment is the same as embodiment 1, and the activator is K 2 CO 3 .

[0056] The obtained porous carbon material has a well-developed pore structure and a specific surface area of ​​1050 m 2 / g.

Embodiment 3

[0058] This embodiment is the same as embodiment 1, but the activator is ZnCl 2 .

[0059] The obtained porous carbon material has a well-developed pore structure and a specific surface area of ​​1190m 2 / g.

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Abstract

The invention discloses a method for preparing porous carbon by stepwise activation of biomass. The method comprises the following preparation process with the steps: after the biomass is crushed anddried and is mixed with an activating agent, activating treatment is carried out under an inertial atmosphere, and the activating agent and the biomass generate activating reaction to initially form biochar with certain porosity; the biochar and the activating agent are dipped uniformly and mixed again, then the activating agent enters pores of the biochar fully, the effective utilization rate ofthe activating agent with good dispersity is greatly increased in the process of secondary activation, and a carbon skeleton can be fully etched to generate a large amount of micropores and mesopores,so that the porous carbon material with a developed porous structure also can be formed even though a little amount of activating agent is used. The method disclosed by the invention has wide application prospect in the fields of catalysis, adsorption and energy storage and the like so as to realize green preparation of the porous carbon material by the biomass and be conductive to push the high-value utilization progress of the biomass.

Description

technical field [0001] The invention relates to the field of biomass utilization, in particular to a method for preparing porous carbon by step-by-step activation of biomass. Background technique [0002] With the gradual depletion of fossil fuels and the increasingly serious environmental problems caused by them, the development of renewable resources has become an urgent task. Biomass is the only renewable carbon source in nature, and it has a series of advantages such as huge content, environmental friendliness, and carbon negative emissions. Therefore, the development of biomass energy is a hot research topic today. Biomass can obtain biochar materials through simple heat treatment (such as pyrolysis, etc.), but because the porosity of biochar obtained by direct pyrolysis is not developed enough, it is difficult to make high-value utilization. Therefore, biochar must be activated to form a porous carbon material with a well-developed pore structure, which can be widely ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/342C01B32/324
CPCC01B32/324C01B32/342C01B32/348
Inventor 陈伟陈应泉杨海平王贤华邵敬爱张雄杨晴张世红陈汉平
Owner HUAZHONG UNIV OF SCI & TECH
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