摘要
采用热重分析仪(TGA)对木质素与纤维素单独热解和共热解基本特性及热解动力学进行了研究。热重分析曲线表明,木质素热解过程是由两个位于不同温度段的热解过程组成,纤维素则仅在300～380℃的温区内迅速热解,在纤维素含量较低(≤40%)共热解时,二者表现为相互抑制作用,但随着纤维素含量增大,二者关系转变为相互促进作用。热解动力学研究表明,纤维素与木质素单独热解和共热解过程都可用一级反应动力学模型来描述,且随着纤维素含量增加,反应活化能(E)也随之增加,但其值总小于活化能线性加和值(Ec),据此可推测共热解过程存在着一定的协同作用。
The characteristics and kinetics of pyrolysis and co-pyrolysis of the cellulose and lignin were investigated using a thermogravimetric analyzer （TGA）. The TG/DTG curves show that the pyrolysis process of lignin alone has two different temperature zones; the rapid pyrolysis of cellulose happens in the temperature zone of 300-380 ℃ ; mutual inhibition occurs in co-pyrolysis at the low content of cellulose （≤40%）, and synergistic effect appears at the high content of cellulose（ ≥ 60%）. The results of kinetics analysis testify that the process of pyrolysis and co-pyrolysis of cellulose and lignin can be described with a first order reaction model. The activation energy（E） increases with the content of cellulose increasing further, but its value is always lower than the activation energy of linear additivity（Ec）, which partly illustrates that synergistic effect happens in the process of co-pyrolysis.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2013年第2期303-307,共5页
Chemical Industry and Engineering Progress
基金
中央高校基本科研业务费专项资金项目(JB-ZR1110)
