生物柴油热解的TG-FTIR联用研究及动力学参数计算  

TG-FTIR investigation on the biodiesel pyrolysis with kinetic calculation

作　　者：霍梦佳[1] 牛胜利[1] 路春美[1] 刘梦琪[1] 李辉[1] 

机构地区：[1]山东大学能源与动力工程学院,山东济南250061

出　　处：《化工进展》2014年第6期1435-1439,共5页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(51206098);山东省优秀中青年科学家科研奖励基金(BS2012NJ005)项目

摘　　要：利用热重（TG）-傅里叶变换红外光谱（FTIR）联用对生物柴油的热解及气体产物的释放特性进行了研究，并通过非预置模型法的Vyazovkin算法和Avrami理论计算了生物柴油热解的活化能和反应级数等动力学参数。生物柴油在554～773K区间存在失重率约为87.59%的失重阶段，伴随的热解气体产物主要包括CO2、H2O、CH4和其他有机化合物，其中主要气相产物析出规律一致，但浓度存在差异。随着升温速率的提高，生物柴油的热解向高温区移动。同时，生物柴油的热解呈现多段特性，在不同转化率区间，动力学参数变化较大，活化能为100.48～151.14kJ/mol，反应级数为1.21～1.24。The pyrolysis characteristic of biodiesel was investigated by the thermogravimetric coupled with the Fourier transform infrared spectroscopy,where the composition of the released gas was also determined. Further,the model free approach of the Vyazovkin method and the Avrami theory were used to calculate the activation energy and the reaction order,respectively. The mass loss segment existed from 554K to 773K during the biodiesel pyrolysis process and the accompanied mass loss percentage was about 87.59%. During the pyrolysis,the gas released mainly included CO2、H2O、CH4 and other organic compounds. The main gases showed consistent regularity but with different density. Meanwhile,as temperature heating rate increased,the decomposition process was shifted to the higher temperature zone. Calculations of the kinetic parameters demonstrated the multistage and the complicated characteristics of the biodiesel pyrolysis,where the variation for the activation energy was from 100.48kJ/mol to 151.14kJ/mol and for the reaction order was from 1.21 to 1.24.

关 键 词：生物柴油 热解 热重-傅里叶变换红外光谱联用 非预置模型法 

分 类 号：TQ646[化学工程—精细化工]