摘要
在木质纤维素研究领域,对其理化特性进行深入研究有利于资源化开发利用。基于热解实验、傅立叶红外光谱、X射线衍射和扫描电镜分析方法,针对玉米秸秆蒸汽爆破后理化特性的变化进行了研究。结果表明:玉米秸秆蒸汽爆破后热解区域比对照具有更宽的温度范围,最大热分解速率显著提高,反应活化能降低16.25%;木质纤维素特征官能团所对应的特征峰吸收强度差异显著;细胞壁的层次结构破碎化,纤维素结晶度降低14.57%。在此基础上构建了蒸汽爆破过程机理模型。实验结果表明:蒸汽爆破对木质纤维素类材料理化特性的改变有显著影响。
In the research fields of lignocellulosic materials,the physical-chemical properties are an important foundation for the resource conversion.Employing thermal gravimetric analysis,Fourier transform infrared spectroscopy,X-ray diffraction and scanning electron microscopy methods,physical-chemical properties changes of steam exploded corn stalk were studied.The results of analysis showed that pyrolysis region of steam exploded corn stalk had a wider temperature range compared with the control substance,during which the maximum self-heating rate increased significantly and activation energies（E） decreased by 16.25%.The characteristic peak absorption intensity was significantly different.The hierarchical structure of the cell wall was completely destroyed,and crystallinity of lignocellulose decreased by 14.57%.Based on this analysis,a mechanism model of steam explosion pretreatment was constructed.The results indicate that physical-chemical properties of corn stalk are significantly affected by steam explosion pretreatment.
出处
《高压物理学报》
EI
CAS
CSCD
北大核心
2012年第2期227-234,共8页
Chinese Journal of High Pressure Physics
基金
国家自然科学基金(70741032)
国家农业科技成果转化资金资助项目(2006GB2D000173)
关键词
蒸汽爆破
玉米秸秆
理化特性
机理模型
steam explosion
corn stalk
physical-chemical properties
mechanistic mode
