基于热重红外联用技术的竹综纤维素热解过程及动力学特性  

Pyrolysis characteristics and kinetics study of bamboo holo-celluloce using TG-FTIR

作　　者：TONG Thi Phuong 马中青[3] 陈登宇[3] 张齐生[3] 

机构地区：[1]南京林业大学 材料科学与工程学院,江苏南京210037 [2]越南林业大学木材工程学院,河内156204 [3]南京林业大学材料科学与工程学院,江苏南京210037

出　　处：《浙江农林大学学报》2014年第4期495-501,共7页Journal of Zhejiang A&F University

基　　金：国家林业公益性行业科研专项(201304611);“十二五”国家科技支撑计划项目(2012BAD30BOO);江苏省普通高校研究生科研创新计划资助项目(CXLX13_524);江苏高校优势学科建设工程资助项目(PAPD)

摘　　要：利用热重红外联用技术(TG-FTIR)研究了竹材综纤维素在不同升温速率下(5.0,10.0,15.0,20.0和30.0℃·min-1)的热解特性和热解动力学。热重分析/热重一次微分曲线(TG/DTG)表明:竹材综纤维素热解可分为干燥、快速裂解和慢速裂解等3个阶段;随着升温速率增加,TG/DTG曲线往高温一侧移动;竹综纤维素热解过程发生复杂的化学反应,包括多重、平行和连续反应;热解挥发分主要由小分子CO,H2O,CH4和CO2,以及一些醛类、酮类、酸类、烷烃、醇类和酚类等有机物组成。利用无模式函数积分法,即Flynn-Wall-Ozawa(FWO)和KissingerAkahira-Sunose(KAS)积分法,对其热解动力学进行研究。结果表明:竹材综纤维素的活化能随着转化率的升高先增大后减小再增大,活化能数值的变化与纤维素/半纤维素不同的热解特性有紧密联系。slow degradation. With the increase of heating rate, the TG/DTG curves moved toward the side of higher temperature region. And the main components of volatiles were small moleculars, CO, H20, CH4 and CO2, also along with kinds of organics, such as aldehydes, ketones, organic acids, alkanes, alcohols, phenols. The fluctuation of activation energy can be interpreted as a result of multiple, parallel and simultaneous reaction occoured in the pyrolysis process. The Model-free methods＇, namely Flynn-Wall-Ozawa （FWO） in tegral method and Kissinger-Akahira-Sunose （KAS） integral method, were Used to research the pyrolysis kinetics. The results showed that with increasing conversion rate, the activation energy of bamboo holocellulose first increased, next decreased and then increased. These changes of activation energy were determined by the pyrolysis characteristics of cellulose and hemicellulose.

关 键 词：木材科学与技术 竹材 综纤维素 热解 动力学 热重红外联用 

分 类 号：TQ351.2[化学工程]