中文摘要：

为了揭示KOH活化烟杆制备活性炭中炭化阶段的反应机理，利用热重法对氮气气氛中烟杆和浸渍KOH的烟杆在不同升温速率下（分别为5，15，30K／min）的热解过程进行了研究。结果表明，随着KOH的加入，降低了烟杆主要成分的分解温度，为炭化之后的活化反应奠定了重要基础。采用Coats—Redfern模型对实验数据进行处理，得出了烟杆和添加KOH的烟杆的热解表观活化能和指前因子，建立了热解动力学模型，发现烟杆及添加KOH的烟杆热解的主要阶段分别可由一段1级反应和2．5级反应过程描述，KOH的存在可将烟杆炭化阶段的活化能降低约30kJ／mol，动力学参数存在补偿效应。

英文摘要：

In order to reveal the mechanism of carbonization process in preparation of activated carbon from tobacco stems with KOH-activation, the pyrolytic process of tobacco stem and that impregnated with KOH was carried out by using thermo-gravimetric analyzer at different heating rates of 5, 15, 30 K/min in N2 atmosphere. The temperature of pyrolytic reactions of main component of tobacco stems can be reduced in the presence of KOI-I, which lays the important foundation of the activation reaction afterward. Coats-Redfern model was used to determine the kinetic parameters for the tobacco stems with/without KOH, including frequency factors and activation energies. The pyrolytic kinetic models of two samples were set up. The main pyrolytic stages can be described by first-order and 2.5-order global model, respectively. The results indicate that the pyrolysis activation energy can be lowered by about 30 kJ/mol in the present of KOH, and the kinetic parameters exhibit compensation effects.