Experimental studies have compared several kinds of shell and wood chip raw materials. In the closed reactor, high temperature pyrolysis promotes the reformation of the shell and self-activation reaction, and the preparation of microporous activated carbon experimental studies has compared several kinds of shells and The wood chip raw material, in the closed reactor, the high temperature pyrolysis promotes the reformation of the shell structure and the self-activation reaction, and the activated carbon with very developed micropores is prepared. The process does not add any activation gas or chemical reagent, and a new micro is innovated. Clean preparation method of porous activated carbon. At a certain heating rate, first, the system is heated to 400 °C, and the natural heat of the coconut shell explains the release of a large amount of pyrolysis gas. The gas mainly contains water vapor, carbon dioxide and carbon monoxide, plus the sealed air in the reactor and the oxygen adsorbed by the raw materials. Forming a mixed activation atmosphere and forming a certain pressure in the closed reactor as the temperature rises; secondly, continuing to raise the temperature to 800 ° C, the aromatization reaction occurs in the organic matter in the coconut shell, and gas generation continues, and the structure is reformed. .
At the same time, due to the pressure inside the closed system, the gas in the coconut shell is forced to escape, which has a certain impact on the structure of the coconut shell, which can improve the structure of the coconut shell, thereby promoting the formation and development of activated carbon micropores during high temperature self-activation; Once again, the temperature is raised to the final temperature of 900 ° C. At high temperature, the mixed activated gas generated by the coconut shell pyrolysis solid carbon and the coconut shell raw material spontaneously reacts to form micropores, and at the same time, the micro pressure formed in the closed reactor increases. The rate of self-activation reaction. In this study, the effects of pyrolysis temperature, pyrolysis time, heating rate, environmental confinement conditions on the composition of self-activated pyrolysis gas, pore structure, specific surface area, pore size distribution and adsorption performance of activated carbon were discussed. The mechanism of pyrolysis self-activated pore preparation for physical activated carbon.
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