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Changes of Chemical Bond in Woody Charcoal from Different Carbonization Temperatures  

Jo, Tae-Su (Quality Control & Standardization Team, Korea Forest Research Institute)
Lee, Oh-Kyu (Div. of Wood Chemistry & Microbiology, Korea Forest Research Institute)
Choi, Joon-Weon (Dept. of Forest Science, College of Agriculture and Lifescience, Seoul National University)
Cho, Sung-Taig (Div. of Wood Chemistry & Microbiology, Korea Forest Research Institute)
Kim, Suk-Kuwon (Quality Control & Standardization Team, Korea Forest Research Institute)
Publication Information
Journal of the Korean Wood Science and Technology / v.37, no.1, 2009 , pp. 87-93 More about this Journal
Abstract
Properties and chemical bonding of wood charcoal were investigated to understand the chemistry occurring in wood carbonization. From the pH changes of wood charcoal, it is revealed that it becomes acidic to weakly basic for charcoal carbonized at about $300^{\circ}C$, whereas it turns to basic at higher carbonization temperature higher than $600^{\circ}C$. Also, the ratio of carbon atoms in the charcoal was increased with increasing the carbonization temperature, while those of oxygen and hydrogen atoms. This tendency was significant when the carbonization temperature was increased up to $600^{\circ}C$ and the ratio changes of the atoms became stable at above $600^{\circ}C$. In the changes of chemical bonding, the ratio of C-C bonding was increased and those of C-O-H and C-O-R bonding was decreased significantly. It is considered that bondings connected to oxygen atoms tends to be broken, and the ratio of C-C bonding increased. Consequently, it is expected that this change may causes occurrence of new functional groups. In addition to that, it seems to be that the chemical bondings undergo the partial decomposition, formation, and recombination steps, Because ratio of C=O bonding tended to be increased or decreased by increasing the carbonization temperature. This understanding of chemical bond changes in charcoal can be a compensative consideration on the knowledges made only by physical parameters in the properties of micro-pore which has limited to explain the phenomenon. Also, it is considered that this can be treated as a basic knowledge for upgrading and development of use of wood charcoal.
Keywords
wood charcoal; ph; elemental content; surface properties; chemical bond; XPS;
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Times Cited By KSCI : 1  (Citation Analysis)
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