During the charring process of wood, lignin is condensed by its structure during pyrolysis to become a polycyclic aromatic hydrocarbon structure. Some carbon charcoal precursors preheated at 600 °C are classified into easy-graphitization precursors and non-graphitizable precursors depending on the raw materials and heat treatment temperatures. During the charring process of wood, lignin is condensed by its structure during pyrolysis to become a polycyclic aromatic hydrocarbon structure. Some carbon charcoal precursors preheated at 600 °C are classified into easy-graphitization precursors and non-graphitizable precursors depending on the raw materials and heat treatment temperatures. Charcoal is a dark brown or black porous solid fuel that remains of wood or woody material after incomplete combustion or pyrolysis under air-insulated conditions. When the charcoal is activated by the gas activation method, the first aliphatic and post-aromatic carbon lattices are burned out with the increase in the loss rate, and the loss in the direction of the crystallites is faster than that in the diameter direction. As a result, the average statistical thickness of the crystallites increases. From the refinement of the crystallites to the active microcrystals, the micropores and mesopores gradually increase, and the adsorption capacity increases.
The main components of wood are cellulose, hemicellulose and lignin. Japan's Kuriyama Asahi studied the pyrolysis process of cellulose, lignin and wood. It is believed that cellulose (hemicellulose is also the same) undergoes dehydration to form a ketol-type intergranular residual glycosylation structure, which is further oxidized and decomposed to form aromatic structure.
Activation activates the activated carbon into a good porous structure. The carbonized material is a semi-finished product of activated carbon products, which is activated into various activated carbon products.
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