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 CO2>H2O>CO≈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.