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High-specific-surface-area hierarchical-pore hollow carbon microspheres taking lignin as raw material and preparation method of microspheres

A high specific surface area, lignin technology, applied in chemical instruments and methods, carbon compounds, non-metallic elements, etc., can solve problems such as single pore size distribution, achieve simple operation, achieve high-value utilization, and achieve sustainable development. Effect

Pending Publication Date: 2021-01-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the obtained lignin-based carbon materials are irregular lumps and powders; and the pore size distribution is relatively simple

Method used

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  • High-specific-surface-area hierarchical-pore hollow carbon microspheres taking lignin as raw material and preparation method of microspheres
  • High-specific-surface-area hierarchical-pore hollow carbon microspheres taking lignin as raw material and preparation method of microspheres
  • High-specific-surface-area hierarchical-pore hollow carbon microspheres taking lignin as raw material and preparation method of microspheres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]In the first step, the coniferous alkali lignin and sodium sulfite are mixed according to a mass ratio of 5:1 and added to water, then stirred and reacted at 120°C for 6 hours, and then the pH of the aqueous solution is adjusted to 7.0 by carbon dioxide gas and sodium sulfite. The total solid content of coniferous alkali lignin and sodium sulfite in the solution is 30%, and finally the aqueous solution is placed in a centrifugal spray dryer for drying. The air inlet temperature of the spray drying is 250°C, and the air outlet temperature The temperature is 100°C, and the evaporation of water per hour is 1.5 tons; lignin microspheres can be obtained, and the moisture content of the lignin microspheres is less than 6%.

[0042] In the second step, the obtained lignin carbon microspheres are placed in a tube furnace and argon is introduced at a flow rate of 200ml / min, and then the temperature is raised to 450°C at a rate of 5°C / min, kept for 50min, and then naturally cooled ...

Embodiment 2

[0047] Mix coniferous alkali lignin and sodium sulfite at a mass ratio of 3:1 and add to water, then stir and react at 150°C for 4 hours, then adjust the pH of the aqueous solution to 8.0 with carbon dioxide gas and sodium sulfite, and inject The total solid content of the leaf material alkali lignin and sodium sulfite is 32%, and finally the aqueous solution is placed in a centrifugal spray dryer for drying. The air inlet temperature of the spray drying is 300°C, and the air outlet temperature is 120°C. The evaporation of water per hour is 2 tons, and the lignin microspheres can be obtained, and the moisture content of the lignin microspheres is less than 6%; Argon gas was introduced at a flow rate of 8°C / min, and then raised to 400°C at a rate of 8°C / min, kept for 60 minutes, and then naturally cooled to room temperature to obtain carbonized lignin microspheres; the carbonized lignin microspheres were mixed with potassium hydroxide according to After blending at a mass ratio...

Embodiment 3

[0050] Mix coniferous alkali lignin and sodium sulfite at a mass ratio of 1:1 and add to water, then stir and react at 220°C for 2 hours, then adjust the pH of the aqueous solution to 9 with carbon dioxide gas and sodium sulfite, and inject The total solid content of the leaf alkali lignin and sodium sulfite is 36%, and finally the aqueous solution is placed in a centrifugal spray dryer for drying. The air inlet temperature of the spray drying is 300°C, and the air outlet temperature is 120°C. The evaporation of water per hour is 2 tons, and the lignin microspheres can be obtained, and the moisture content of the lignin microspheres is less than 6%; The flow rate of argon was passed into, and then the temperature was raised to 500°C at a rate of 10°C / min, and kept for 80 minutes, and then naturally cooled to room temperature to obtain carbonized lignin microspheres; the obtained carbonized lignin microspheres were mixed with potassium hydroxide according to After blending with...

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Abstract

The invention discloses high-specific-surface-area hierarchical-pore hollow carbon microspheres taking lignin as a raw material and a preparation method of the microspheres. The method comprises the following steps: performing spray drying on a mixed solution of lignin and sulfite to obtain lignin microspheres, carbonizing the microspheres in inert gas to obtain carbonized microspheres, mixing thecarbonized microspheres with an activating agent, and fianlly performing drying and activating to obtain the hollow carbon microsphere with an intact spherical structure, a high specific surface area, a large pore volume, rich surface activity and a multi-layer pore structure. The maximum specific surface area of the hollow carbon microspheres can reach 3406 m<2> / g, the pore volume can reach 2.46cm<3> / g, the surface oxygen content can reach 9.59 at%, and with the excellent pore structure and surface chemical characteristics, the microspheres can be widely applied to the industries of electronics, chemical engineering, environmental protection and the like. Moreover, the microspheres are simpel in preparation process, convenient to operate and low in cost, and have very good industrial application value.

Description

technical field [0001] The invention belongs to the technical field of biomass carbon materials, and in particular relates to a high specific surface area and multi-level porous hollow carbon microspheres using lignin as a raw material and a preparation method thereof. Background technique [0002] With the development of industry and the increase of population, the consumption of fossil fuels is increasing rapidly, and the energy and environmental problems caused by it are becoming more and more serious. Therefore, mankind urgently needs to find a green and sustainable raw material to produce new energy and high-performance materials. As a naturally abundant and renewable resource, lignocellulosic biomass is expected to replace fossil raw materials. Lignin is an important component of plant cell walls, and its content is the second largest natural polymer after cellulose. Its high carbon content, good thermal stability, unique benzene ring structure, biodegradability and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/324
CPCC01B32/324C01B32/348
Inventor 武书彬刘双程皓魏文光张凤山
Owner SOUTH CHINA UNIV OF TECH
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