Pyrolysis behaviors of four lignin polymers isolated from the same pine wood
Pyrolysis behaviors of four lignin polymers isolated from the same pine wood
复制标题
从同一松木中分离出的四种木质素聚合物的热解行为
DOI：
10.1016/j.biortech.2015.01.127
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发表时间：
2015-04-01
影响因子：
11.4
通讯作者：
Luo, Zhongyang
中科院分区：
文献类型：
--
作者：
Wang, Shurong;Ru, Bin;Luo, Zhongyang
从同一种松木中分离得到碱木质素（AL）、木质素（KL）、有机溶剂木质素（OL）和磨木木质素（MWL）四种木质素聚合物。FTIR和C-13 NMR的结构表征表明，四种木质素具有不同的结构特征。采用TG-FTIR和Py-GC/MS对其热解行为进行了分析。热不稳定的醚键和侧支在AL和MWL中保存完好，而在OL和KL中断裂，AL和KL的热解在低温下通过醚键断裂产生更多的酚类物质。AL和KL在主要降解阶段表现出较低的活化能，用两个线性组合高斯函数的分布活化能模型量化。分析了典型气态产物CH4、CO2和CO的演化行为，获得了化学结构与热解行为之间的关系。(c) 2015 Elsevier Ltd.版权所有。
Four lignin polymers, alkali lignin (AL), klason lignin (KL), organosolv lignin (OL), and milled wood lignin (MWL), were isolated from the same pine wood. Structural characterization by FTIR and C-13 NMR indicated that the four lignins have different structural features. Their pyrolysis behaviors were analyzed by TG-FTIR and Py-GC/MS. Thermally unstable ether bonds and side branches were well-preserved in AL and MWL, but were broken in OL and KL. Pyrolysis of AL and KL produce more phenols at low temperature by the breakage of ether bonds. AL and KL show lower activation energies in the main degradation stage, quantified by a distribution activation energy model with two linearly combined Gaussian functions. The evolution behaviors of typical gaseous products, CH4, CO2, and CO, were analyzed, and insights about the correlation between chemical structure and pyrolysis behavior were obtained. (c) 2015 Elsevier Ltd. All rights reserved.