Method of preparing biomass high specific surface micro-pore carbon material

Abstract

The present invention belongs to the preparation field of micropore carbon material, and relates to the preparation method for micropore carbon material with high specific surface area and narrow pore distribution by biomass. The biomass is cleaned and cut into subparagraph with a length of 1~3 centimeter, and then is subjected to carbonizing at 300~500 DEG C for 3~4 hours in the presence of inert atmosphere. The obtained carbonizing product is immerged into an alkaline solution for 20~24 hours until the carbonizing product is totally wetting, and then the carbonizing product is separated from the solution and is activated for 1.5~3 hours at 700~800 DEG C in the presence of inert atmosphere, and then is scrubbed by water until the pH value of the scrub solution is 7~8, and then the carbonizing product is immerged into a diluted acid solution for 4~5 hours and is scrubbed by water until the pH value of the scrub solution is 6~7, finally, the carbonizing product is dried at 80~120 DEG C to obtain micropore carbon material. The preparation method for the present invention has the advantages of that the preparation process is simple, the raw material is cheap and abundant, the preparation condition is free from zone limit; besides, the preparation method is adapted to industrial production.

Description

technical field [0001] The invention belongs to the field of preparation of microporous carbon materials, in particular to a method for preparing microporous carbon materials by using biomass, in particular to preparing microporous carbon materials with high specific surface area and narrow pore distribution by using biomass. Background technique [0002] Due to its special pore structure and high specific surface area, microporous carbon materials play an important role in daily life. Now, microporous carbon materials have been widely used in gas storage and separation, electrode materials for batteries or capacitors, catalysts or catalyst supports for various chemical reactions, sewage treatment, precious metal recovery, etc. In the market, the more common microporous carbon material is activated carbon, which uses charcoal, various fruit shells and high-quality coal as raw materials, and uses physical and chemical methods to crush, sieve, activate catalysts, rinse and dry...

AI Technical Summary

Problems solved by technology

[0004] Activated carbon prepared by physical activation is mainly microporous carbon material. Although the pore distribution of the prepared activated carbon is relatively narrow, it has good application effect in various application fields, but the ratio of microporous carbon material prepared by this method is Low surface area, these microporous carbon materials are not yet ideal for applications

Although the specific surface area of ​​the activated carbon prepared by the chemical activation method has been greatly improved compared with the activated carbon prepared by the physical activation method, and the use effect is better in many aspects, the pore distribution of the activated carbon prepared by the chemical activation method is generally very poor. wide, which limits the application of activated carbon prepared by chemical activation in some aspects (such as gas separation)

Images