Characteristics of hemicellulose, cellulose and lignin pyrolysis
Characteristics of hemicellulose, cellulose and lignin pyrolysis
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DOI：
10.1016/j.fuel.2006.12.013
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发表时间：
2007-08-01
期刊：
影响因子：
7.4
通讯作者：
Zheng, Chuguang
中科院分区：
文献类型：
--
作者：
Yang, Haiping;Yan, Rong;Zheng, Chuguang
利用热重分析仪（TGA）和填充床分别研究了生物质中3种主要组分（半纤维素、纤维素和木质素）的热解特性。利用傅里叶变换红外光谱（FTIR）技术对生物质热解过程中主要气体产物的释放进行了在线监测。在热分析中，半纤维素和纤维素的热解速度较快，半纤维素的失重主要发生在220-315 ℃，纤维素的失重主要发生在315-400 ℃。然而，木质素更难以分解，因为其重量损失发生在宽的温度范围内（从160至900 ° C），并且产生的固体残留物非常高（类似于40重量%）。从热解过程的能耗来看，纤维素与半纤维素和木质素的热解行为不同，前者的热解是吸热的，而后者是放热的。三种组分热解的主要气体产物相似，均为CO2、CO、CH 4和一些有机物。利用微型气相色谱仪测定了三种组分在填充床中热解时的氢气释放行为和总气体产率。半纤维素具有较高的CO2产率，纤维素具有较高的CO产率，木质素具有较高的H2-和CH 4产率。通过对生物质三种主要组分的深入研究，可以更好地了解生物质热解气体产物。(c)2006爱思唯尔有限公司保留所有权利。
The pyrolysis characteristics of three main components (hemicellulose, cellulose and lignin) of biomass were investigated using, respectively, a thermogravimetric analyzer (TGA) with differential scanning calorimetry (DSC) detector and a pack bed. The releasing of main gas products from biomass pyrolysis in TGA was on-line measured using Fourier transform infrared (FTIR) spectroscopy. In thermal analysis, the pyrolysis of hemicellulose and cellulose occurred quickly, with the weight loss of hemicellulose mainly happened at 220-315 degrees C and that of cellulose at 315-400 degrees C. However, lignin was more difficult to decompose, as its weight loss happened in a wide temperature range (from 160 to 900 degrees C) and the generated solid residue was very high (similar to 40 wt.%). From the viewpoint of energy consumption in the course of pyrolysis, cellulose behaved differently from hemicellulose and lignin; the pyrolysis of the former was endothermic while that of the latter was exothermic. The main gas products from pyrolyzing the three components were similar, including CO2, CO, CH4 and some organics. The releasing behaviors of H-2 and the total gas yield were measured using Micro-GC when pyrolyzing the three components in a packed bed. It was observed that hemicellulose had higher CO2 yield, cellulose generated higher CO yield, and lignin owned higher H-2 and CH4 yield. A better understanding to the gas products releasing from biomass pyrolysis could be achieved based on this in-depth investigation on three main biomass components. (c) 2006 Elsevier Ltd. All rights reserved.