Chemical structural features of pyridine extracts and residues of the Argonne Premium coals using solid-state C-13 NMR spectroscopy
Chemical structural features of pyridine extracts and residues of the Argonne Premium coals using solid-state C-13 NMR spectroscopy
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DOI：
10.1021/ef00042a006
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发表时间：
1993-11
期刊：
影响因子：
5.3
通讯作者：
T. Fletcher;S. Bai;R. Pugmire;M. Solum;S. Wood;D. Grant
中科院分区：
文献类型：
--
作者：
T. Fletcher;S. Bai;R. Pugmire;M. Solum;S. Wood;D. Grant
使用氩气吹扫的吡啶对八种阿贡优质煤进行索氏萃取，然后进行新的洗涤程序以除去吡啶。重复实验的质量闭合（提取物加残留物）占原始煤的94- 96%，可重复性在2%以内。从13 C NMR分析的提取物和残留物确定的化学结构特征显示更多的附件每个芳香族簇的残留物，表明更大程度的共价键合的残留物比在提取物。1 H NMR分析表明，随着煤级的增加，氢芳香度逐渐增加，高挥发分烟煤中α-氢含量沿着增加
Soxhlet extractions were performed on the eight Argonne Premium coals using pyridine purged with argon and followed by a novel washing procedure to remove the pyridine. Mass closure (extracts plus residues) on duplicate experiments accounted for 94-96 % of the original coal, repeatable to within 2 %. Chemical structural features determined from 13 C NMR analyses of the extracts and residues showed more attachments per aromatic cluster for the residues, indicating a greater degree of covalent bonding in the residue than in the extract. 1 H NMR analysis of the extracts showed a gradual increase in the hydrogen aromaticity with rank, along with a maximum in the percentage of α-hydrogen in the high-volatile bituminous coals