Molecular characterization of flash pyrolysates of two Carboniferous coals and their constituting maceral fractions
Molecular characterization of flash pyrolysates of two Carboniferous coals and their constituting maceral fractions
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DOI：
10.1021/ef00047a008
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发表时间：
1994-09
期刊：
影响因子：
5.3
通讯作者：
J. Damsté;W. A. Hartgers;Y. Ling;J. W. Leeuw;G. Dyrckacz
中科院分区：
文献类型：
--
作者：
J. Damsté;W. A. Hartgers;Y. Ling;J. W. Leeuw;G. Dyrckacz
通过密度梯度离心 (DGC) 获得的两种来自阿贡优质煤组的高挥发性上石炭统烟煤及其组成的脂质体、镜质体和惰质体部分，通过居里点热解-气相色谱-质谱法进行了表征。对热解产物进行了详细分析，将各个显微物质与其（植物来源的）前体联系起来。发现脂体部分主要由孢子体组成，孢子体是孢粉质的成岩产物。其热解产物中正烷-1-烯和正烷烃的丰度和特征分布反映了其脂肪族特征，在 C11 和 C25 处显示最大值。此外，通过官能化线性前体的环化和芳构化，观察到源自线性碳骨架的芳香族成分的选择性富集。在富含硫的伊利诺伊州 6 号煤中，非生物无机硫物种向功能团的添加反映在脂褐煤中有机硫化合物的选择性富集。来自裸子植物木材的成岩改变木质素最有可能是镜质体的前体，镜质体是两种煤的主要成分。镜质组的快速热解产物主要是烷基苯和烷基酚。惰性组分表现出相对大量的(多)芳族热解产物。热萃取实验表明，这些组分主要以吸附或截留在显微基质的孔隙系统中的形式存在。
Two high-volatile bituminous Upper Carboniferous coals from the Argonne Premium Coal Set and their constituting liptinite, vitrinite, and inertinite fractions, obtained by density gradient centrifugation (DGC), were characterized by Curie point pyrolysis-gas chromatography-mass spectrometry. A detailed analysis of the pyrolysis products was performed to relate individual macerals to their (plant-derived) precursors. Liptinite fractions were found to be mainly composed of sporinite, the diagenetic product of sporopollenin. Its aliphatic character was reflected in its pyrolysate by the abundance and characteristic distribution of n-alk-1-enes and n-alkanes showing maxima at C₁₁ and C₂₅. Moreover, a selective enrichment of aromatic components derived from linear carbon skeletons via cyclization and aromatization of functionalized, linear precursors was observed. In the sulfur-rich Illinois No. 6 coal, the addition of abiotic inorganic sulfur species to functional groups was reflected by a selective enrichment of organic sulfur compounds in the liptinite maceral. Diagenetically altered lignin derived from gymnospermous wood is the most likely precursor for vitrinite, the major constituent of both coals. Flash pyrolysates of vitrinite fractions were dominated by alkylbenzenes and alkylphenols. Inertinite fractions exhibited relatively high amounts of (po1y)aromatic pyrolysis products. Thermal extraction experiments revealed that these components were mainly present as such adsorbed to or entrapped in the pore system of the maceral matrix.