生物质主要组分低温热解研究

Low temperature pyrolysis characteristics of major components of biomass

利用热重分析仪和裂解气质联用仪进行生物质主要组分低温热解特性研究。热重实验结果表明，生物质主要组分的热稳定性为：纤维素〉木质素〉半纤维素。半纤维素主要热解温度在210℃～320℃，而纤维素和木质素的主要热解温度分别在310℃～390℃和200℃～550℃。裂解气质联用实验考察不同温度对生物质主要组分低温热解产物的影响。半纤维素热解产物主要有乙酸、1-羟基-丙酮和1-羟基-2-丁酮，纤维素热解产物主要包括左旋葡聚糖和脱水纤维二糖，而木质素热解产物主要是邻甲氧基苯酚。

The low temperature pyrolysis characteristics of major components of biomass were investigated using thermogravimetric analysis （TGA） and pyrolysis-gas chromatography/mass spectrometry （Py-GC/MS）. The TGA results show that thermal stability of major components of biomass was in descending order of cellulose 〉 lignin 〉 hemicellulose. The main pyrolysis temperature range of hemicellulose is at 210 ℃ -320 ℃, whereas those of cellulose and lignin are 310 ℃ -390 ℃ and 200 ℃-550 ℃ respectively. The Py-GC/MS was used for studying the effects of temperature on low temperature pyrolysis products of major components of biomass, which had different contribution to the volatiles. The degradation of hemicellulose generates acetic acid, 1-hydroxy-propanone and 1-hydroxy-2-butanone. The high yield of levoglucosan and anhydro-cellobise is from pyrolysis of cellulose. Guaiacol is associated with degradation of the lignin.