摘要
利用傅里叶变换红外光谱仪分析木聚糖微观结构,采用热重分析法对木聚糖的热解特性进行实验研究。通过TG和DTG曲线的分析,把木聚糖的热解反应过程分为4个阶段。综合分析热解实验结果发现:30℃/min的升温速率是反应的最佳环境。由分子模拟计算结果,500K和700K分别对应热解实验的第2阶段和第3阶段;低温时半纤维素的热解反应进行得十分剧烈,主要对应半纤维素支链的断裂;随着温度的升高,半纤维素主链发生分解生成各种产物。实验结果和分子模拟的结果能够较好地吻合。
The microstructure of xylan was analyzed by using Fourier Transform Infrared Spectrometer(FTIR Spectrometer),and thermogravimetric analysis was used to research the pyrolysis characteristics of xylan.The xylan pyrolysis reaction process is divided into four stages according to the TG and DTG curves.And the pyrolysis experiment result tells that 30℃/min heating rate is the best reaction circumstance.It is found that 500 K and 700 K respectively corresponding to the second stage of pyrolysis experiment and the third stage by analyzed the molecular simulation results;pyrolysis reaction of hemicellulose is severe when the temperature is low,mainly corresponding the rupture of hemicellulose branched chain;the main chain of the hemicellulose decomposed to generate a variety of products with the increase of temperature.The experimental results and molecular simulation results can fit well.
出处
《节能》
2015年第11期18-23,2,共6页
Energy Conservation
基金
国家自然科学基金(项目编号:51276023)
湖南省自然科学基金(项目编号:2015JJ4005)
关键词
木聚糖
热解特性
分子模拟
xylan
pyrolysis characteristics
molecular simulation
