Department of Mechanical Engineering, Chiang Mai University, Chiang Mai 50200, Thailand.
Bioresour Technol. 2010 Jul;101(14):5638-44. doi: 10.1016/j.biortech.2010.02.037. Epub 2010 Mar 1.
A giant sensitive plant (Mimosa pigra L.) or Mimosa is a fast growing woody weed that poses a major environmental problem in agricultural and wet land areas. It may have potential to be used as a renewable energy source. In this work, thermal behaviour of dried Mimosa was investigated under inert atmosphere in a thermogravimetric analyzer at the heating rates of 10, 30, and 50 degrees C/min from room temperature to 1000 degrees C. Pyrolysis kinetic parameters in terms of apparent activation energy and pre-exponential factor were determined. Two stages of major mass loss occurred during the thermal decomposition process, corresponding to degradation of cellulose and hemicellulose between 200-375 degrees C and decomposition of lignin around 375-700 degrees C. The weed mainly devolatilized around 200-400 degrees C, with total volatile yield of about 60%. The char in final residue was about 20%. Mass loss and mass loss rates were strongly affected by heating rate. It was found that an increase in heating rate resulted in a shift of thermograms to higher temperatures. As the heating rates increased, average devolatilization rates were observed to increase while the activation energy decreased.
巨型含羞草（Mimosa pigra L.）或含羞草是一种快速生长的木本杂草，在农业和湿地地区造成了重大的环境问题。它有可能被用作可再生能源。在这项工作中，在热重分析仪中，在惰性气氛下以 10、30 和 50°C/min 的加热速率从室温加热至 1000°C 研究了干燥含羞草的热行为。以表观活化能和指前因子的形式确定了热解动力学参数。在热分解过程中发生了两个主要质量损失阶段，对应于 200-375°C 之间纤维素和半纤维素的降解以及 375-700°C 左右木质素的分解。杂草主要在 200-400°C 左右挥发，总挥发物产率约为 60%。最终残渣中的焦碳约为 20%。加热速率强烈影响质量损失和质量损失速率。发现升高加热速率会导致热谱向更高温度移动。随着加热速率的增加，观察到平均挥发速率增加，而活化能降低。
