Offgas Analysis and Pyrolysis Mechanism of Activated Carbon from Bamboo Sawdust by Chemical Activation With KOH

• Published in: Journal of Wuhan University of Technology. Materials science edition 2011-02, Vol.26 (1), p.10-14
• Main Authors: Tian, Yong, Liu, Ping, Wang, Xiufang, Zhong, Guoying, Chen, Guanke
• Format: Article
• Language: English
• Subjects: Activation; Activation analysis; Analyzers; Bamboo; Carbon monoxide; Chemistry and Materials Science; KOH; Materials Science; Porosity; Pyrolysis; Sawdust; 化学活化; 废物综合利用; 活性炭; 烟气分析; 热解机理; 热重分析仪
• ISSN: 1000-2413; 1993-0437
• DOI: 10.1007/s11595-011-0157-9

Bamboo sawdust was used as the precursor for the multipurpose use of waste. Offgases released during the activation process of bamboo by KOH were investigated quantitatively and qualitatively by a gas analyzer. TG/DTG curves during the pyrolysis process with different impregnation weight ratios （KOH to bamboo） were obtained by a thermogravimetric analyzer. Pyrolysis mechanism of bamboo was proposed. The results showed that the offgases were composed of CO, NO, SO2 and hydrocarbon with the concentration of 1 372, 37, 86, 215 mg/L, respectively. Thermogravimetric analysis indicated that the pyrolytic process mainly experienced two steps. The first was the low temperature activation step （lower than 300 ℃）, which was the pre-activation and induction period. The second was the high temperature activation step（higher than 550 ℃）, which was a radial activation followed by pore production. The second process was the key to control the pore distribution of the final product.