A study of slow pyrolysis of one low rank coal via pyrolysis-GC/MS
A study of slow pyrolysis of one low rank coal via pyrolysis-GC/MS
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DOI：
10.1016/j.fuproc.2013.04.026
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发表时间：
2013-12-01
影响因子：
7.5
通讯作者：
Guo, Xiaofen
中科院分区：
文献类型：
--
作者：
Lievens, Caroline;Ci, Donghui;Guo, Xiaofen
本文介绍了一种低阶煤的研究。为了研究其分子结构，LRC通过工业和元素分析、XRD、FTIR、拉曼光谱和热解-GC/MS（py-GC/MS）表征。轻挥发性馏分的LRC，其特征在于通过py-GC/MS。LRC的芳环结构包括59%的无定形结构，22%的高度有序的结构，不少于6个环，16%的芳香族结构，其特征在于脂肪族和/或醚取代和3%的取代苯环。XRD结果表明，LRC的结晶单元含有1.44个芳香族碳原子/脂肪族碳原子。LRC内的芳香族簇结构通过醚键和共价C-C键相互连接。羟基、醚和羰基官能团赋予LRC极性特征。LRC的缓慢热解导致由20%的芳环化合物、45%的酚类化合物、30%的脂肪烃和5%的O-化合物组成的轻挥发性GC/MS检测馏分，其浓度、演化和性质取决于加热速率和终止温度。一般来说，LRC在700摄氏度下的缓慢热解产生最高浓度的不饱和无环烃、芳烃和酚类。(C)2013爱思唯尔有限公司版权所有。
This paper describes the study of one low rank coal (LRC). To investigate its molecular structure, a LRC was characterized by proximate and ultimate analyses, XRD, FTIR, Raman spectroscopy, and pyrolysis-GC/MS (py-GC/MS). The light volatile fraction of LRC was characterized via py-GC/MS. LRC's aromatic ring structures consist of 59% amorphous structures, 22% of highly ordered structures with no less than 6 rings, 16% of aromatic structures characterized by aliphatic and/or ether substitutions and 3% of substituted benzene rings. XRD results show that the crystalline unit of LRC contains 1.44 aromatic carbon atoms per aliphatic carbon atom. Aromatic cluster structures within LRC are interconnected via ether- and covalent C-C bonds. Hydroxyl, ether and carbonyl functionalities give LRC its polar character. The slow pyrolysis of LRC resulted in a light volatile GC/MS detected fraction consisting of 20% aromatic ring compounds, 45% of phenolics, 30% of aliphatic hydrocarbons and 5% O-compounds, of which the concentration, evolution and nature were dependent on the heating rates and end temperatures. Generally, slow pyrolysis of LRC at 700 degrees C yielded the highest concentrations of unsaturated acyclic hydrocarbons, aromatics and phenolics. (C) 2013 Elsevier B.V. All rights reserved.