Infrared spectroscopy analysis on charcoal generated by the pyrolysis of Corymbia. citriodora wood

ABSTRACT Wood pyrolysis has been use for centuries to obtain charcoal. Nonetheless, the study of wood components altering by the pyrolysis temperature is crucial to determine the charcoal’s properties. The present research aims to evaluate by FTIR the chemical altering of wood submitted to various pyrolysis temperatures. Sam-ples of Corymbia citriodora species were submitted to temperatures of 240 °C, 280 °C, 320 °C and 400 °C in a fixed bed reactor filled with N2. The FTIR analysis was performed in the wood residues after pyrolysis. The results showed that cellulose and hemicelluloses presented more susceptibility to thermal degradation than other wood components. It could be observed chemical altering in the wood residue obtained between 240 °C and 280 °C. In addition, the wood residue obtained for treatments over 280 °C presented characteristics simi-lar to vegetal charcoal. There are a continuous change of the wood due to the temperature of the pyrolysis by the change of bands intensity and by the bands shift. The FTIR analysis allowed the evaluation of the wood’s pyrolysis process and its chemical variations with the temperatures applicate.

摘要：木材热解已有数百年历史，长期用于制取木炭。然而，探究热解温度对木材组分的改变规律，对于明确木炭的性能至关重要。本研究采用傅里叶变换红外光谱（FTIR）技术，分析不同热解温度下木材的化学变化。实验以柠檬桉（Corymbia citriodora）为试样，在充有氮气（N₂）的固定床反应器中，分别于240℃、280℃、320℃及400℃下进行热解处理，并对热解后的木材残渣开展FTIR分析。结果表明，相较于木材其他组分，纤维素与半纤维素对热降解的敏感性更强。可观察到，在240℃至280℃热解得到的木材残渣中发生了化学变化。此外，热解温度高于280℃时得到的木材残渣，其特性与植物木炭相近。随着热解温度升高，通过谱带强度变化与谱带位移可发现，木材始终发生着持续性的化学变化。FTIR分析可有效评估木材热解过程，以及不同热解温度下的化学组分变化。