热重红外光谱法考察木质生物质综纤维素热转化特性  

TG-FTIR Study of the Thermal-Conversion Properties of Holo-Cellulose Derived from Woody Biomass

作　　者：任学勇[1] 王文亮[1] 白甜甜[1] 司慧[2] 常建民[1] 田红星[1] 

机构地区：[1]北京林业大学材料科学与技术学院,北京100083 [2]北京林业大学工学院,北京100083

出　　处：《光谱学与光谱分析》2013年第9期2392-2397,共6页Spectroscopy and Spectral Analysis

基　　金：国家"863计划"项目(2012AA101808-06);国家自然科学基金项目(30972309)资助

摘　　要：热重红外光谱联用考察了木质生物质纤维素、半纤维素以及综纤维素的热转化特性,并与微晶纤维素和木聚糖等模型化合物进行了对比分析。应用三维扩散模型计算了活化能、指前因子等热转化动力学参数,拟合效果良好。通过分析气相产物三维IR图谱,在最大失重速率附近,观察到了H2O,CO,CO2,CH4和含氧化合物的明显特征峰。讨论了主要气体产物可能的生成途径,发现其产量顺序为CO2>H2O>CO≈CH4。综合分析得出,综纤维素的热转化过程是纤维素主导下、纤维素和半纤维素综合作用的结果。Thermal-conversion properties of cellulose,hemi-cellulose and holo-cellulose derived from woody biomass were studied using TG-FTIR,and also compared to those of avicel cellulose and xylan.3-D diffusion model was applied to calculate the kinetic parameters of thermal-conversion reaction of biomass materials,such as the activation energy,pre-exponential factors,etc,which showed good regression results.With the analysis of three-dimensional IR spectra of gas products,featured peaks of H2O,CO,CO2,CH4,and oxygenates were obviously observed where showing up with the maximum weight-loss rate in DTG curves.The possible forming routes of major gaseous products were analyzed and discussed.The order of releasing amounts for gaseous productions was approximately as CO2H2OCO≈CH4.Based on the comprehensive understanding and comparative analysis of the whole results,it is concluded that the thermal conversion process of holo-cellulose was the result of interaction between cellulose and hemi-cellulose under the dominant role of cellulose.

关 键 词：木质生物质 热转化 综纤维素 纤维素 半纤维素 热重红外光谱法 

分 类 号：TK6[动力工程及工程热物理—生物能]