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Preparation method of biomass-based porous carbon and product

A technology of porous carbon and biomass, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of small specific surface area of ​​the product and complicated preparation process, and achieve the effect of simple method, simple process and high activation effect.

Inactive Publication Date: 2019-06-14
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, in the prior art, on the one hand, the raw material requirements for biomass are relatively high, generally requiring the cellulose content of the raw material to be above 20% to achieve better results; on the other hand, the biomass-based materials obtained in the prior art The preparation process of hierarchical porous carbon is complicated, and the specific surface area of ​​the obtained product is small

Method used

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  • Preparation method of biomass-based porous carbon and product
  • Preparation method of biomass-based porous carbon and product
  • Preparation method of biomass-based porous carbon and product

Examples

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preparation example Construction

[0047] Such as figure 1 Shown is a flow chart of a preparation method for a biomass-based porous carbon constructed according to a preferred embodiment of the present invention, comprising the following steps:

[0048] S1 crushing biomass to biomass particles smaller than 40 mesh; wherein, the biomass is sugar biomass and / or lignocellulosic biomass

[0049] S2 Mix the biomass particles obtained in step S1 with organic potassium salt or organic sodium salt according to a certain mass ratio, and then dry to obtain a porous carbon precursor; wherein, the biomass particles and organic potassium salt or organic sodium salt The mass ratio is 1:0.5-1:4. Preferably, the mass ratio of the biomass particles to organic potassium salt or organic sodium salt is 1:1-1:2. The material particles are mixed with organic potassium salt or organic sodium salt by direct mechanical mixing or solvent-assisted mechanical mixing. In the solvent-assisted mechanical mixing method, a mixed solvent need...

Embodiment 1

[0056] Example 1, the raw material is cellulose, the main component of lignocellulosic biomass. ,

[0057] Weigh 0.5g of microcrystalline cellulose and 0.5g of potassium acetate, add 0.5mL of absolute ethanol and mix to a thick slurry, transfer to a corundum crucible, carry out one-step drying and one-step inert atmosphere calcination in a vertical furnace, the heating program is : From room temperature to 100°C in 5 minutes, after keeping for 30 minutes, raise the temperature to 800°C at a rate of 10°C / min and keep it warm for 2 hours. After natural cooling, a semi-finished product of biochar is obtained. The obtained biochar was washed with 1M hydrochloric acid for 6 hours, washed with deionized water until neutral, and dried at 80° C. for 10 hours to obtain a biomass-based porous carbon with an actual yield of about 14.1% (based on the quality of raw materials). Its scanning electron microscope picture is as figure 2 As shown, micron-scale etched channels can be seen dee...

Embodiment 2

[0058] In Example 2, the raw material is xylan, the main sugar component in lignocellulosic biomass.

[0059] Weigh 0.5g of xylan extracted from beech wood and 0.5g of potassium acetate, add 0.2mL of absolute ethanol to mix to a thick slurry, transfer to a corundum crucible, and perform one-step drying and one-step inert atmosphere in a vertical furnace For calcination, the heating program is as follows: rise from room temperature to 700°C for 5 minutes, hold for 30 minutes, then raise the temperature to 800°C at a rate of 10°C / min and hold for 2 hours. After natural cooling, the biochar semi-finished product is obtained. The obtained biochar was washed with 1M hydrochloric acid for 6 hours, washed with deionized water until neutral, and dried at 100°C for 2 hours to obtain a biomass-based porous carbon with an actual yield of about 4% (based on the quality of raw materials). Its scanning electron microscope picture is as Figure 5 As shown, it can be seen that the macroporou...

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Abstract

The invention belongs to the field of biomass energy utilization, and discloses a preparation method of biomass-based porous carbon and a product. The method comprises the following steps: S1, mixingbiomass particles and an organic potassium salt or an organic sodium salt, heating and drying a mixture to obtain a porous carbon precursor; S2, heating, pyrolyzing and carbonizing the porous carbon precursor in an inert atmosphere, and then performing heat preservation; S3, performing acid pickling on the mixture, removing an alkali metal salt, then filtering and flushing the mixture with an excessive amount of deionized water till the filtrate is neutral, and performing drying to obtain the biomass-based porous carbon. The invention further discloses a corresponding product. According to thepreparation method, the preparation conditions are adjusted, the biomass is subjected to catalytic carbonization by adopting an activating agent, and the activating agent catalyzes the carbonizationand coking of the biomass, and is fully in contact with coke particles for further activation to generate micropores in order to obtain the biomass-based porous carbon with a large specific surface area. The method is simple, is a green and sustainable preparation method, and has wide applicablity for different saccharides and lignocellulose biomass raw materials.

Description

technical field [0001] The invention belongs to the technical field of biomass energy utilization, and more specifically relates to a preparation method and product of biomass-based porous carbon. Background technique [0002] Biomass is the only carbon-containing clean and renewable resource, which can replace fossil energy such as petroleum and coal for power production and carbon material preparation. The development of biomass energy is conducive to optimizing my country's energy supply structure and alleviating increasingly severe environmental problems. [0003] Biomass-based porous carbon has been used for a long time. As early as the Han Dynasty in my country, charcoal made of wood was used in moisture absorption and decolorization. Nowadays, biomass-based porous carbon relies on its developed pore structure, good thermal and electrical conductivity, high stability, easy doping load and other characteristics, and has a wide range of applications in the fields of ads...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/318C01B32/348
Inventor 陈汉平夏明巍杨海平陈应泉张雄陈伟邵敬爱杨晴曾阔王贤华张世红
Owner HUAZHONG UNIV OF SCI & TECH
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