Abstract The structural features and pyrolysis characteristics of Shendong demineralized coal (DC) and its ethanol swelling coal (EDSC) were investigated by Fourier transform infrared (FTIR), solid-state cross-polarization magic angle spinning carbon-13 nuclear magnetic resonance (CP/MAS 13C-NMR), thermo-gravimeter-Fourier transform infrared (TG-FTIR) spectroscopy, the self-made steel retort assay, and pyrolysis gas chromatography-mass spectrometer (Py-GC/MS). The pyrolysis product coal tar from the self-made steel retort assay was extracted by n-hexane to obtain the n-hexane solubles (CTHS) as well as the n-hexane insolubles (CTHIS). The composition of CTHS has been explored by the analysis of GC/MS, and CTHIS was investigated by the analyses of TG-FTIR and Py-GC/MS. The analysis data display that the coal tar yield of EDSC increases by 0.42 wt% and the semi-coke yield of EDSC decreases by 1.33 wt%. The intensity of −OH stretching vibration at 3405 cm−1 in the FTIR spectra of EDSC is weakened and the peak moves to the low wave number. Aliphatic carbons and aromatic carbons of EDSC decrease. The content of neutral compounds in EDSC pyrolysis tar increases by 2.01 wt%. CTHIS mainly includes phenols, alkanes, aromatics and pyridine. Phenolic compounds and nitrogen-containing heterocyclic compounds in the pyrolysis volatiles of EDSC-CTHIS increase by 1.12 wt% and 1.46 wt%, respectively.

中文翻译：

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乙醇溶胀神东煤的热解特性及其煤焦油的组成分布

摘要 采用傅里叶变换红外（FTIR）、固态交叉极化魔角自旋碳-13核磁共振（CP/ MAS 13C-NMR)、热重仪-傅里叶变换红外 (TG-FTIR) 光谱、自制钢罐测定和热解气相色谱-质谱仪 (Py-GC/MS)。用正己烷提取自制钢罐测定的热解产物煤焦油，得到正己烷可溶物（CTHS）和正己烷不溶物（CTHIS）。通过GC/MS分析探索了CTHS的组成，通过TG-FTIR和Py-GC/MS分析研究了CTHS。分析数据表明，EDS煤焦油收率增加了0。42 wt%，EDS 半焦收率下降 1.33 wt%。EDSC 的 FTIR 光谱中 3405 cm-1 处的 -OH 伸缩振动强度减弱，峰向低波数移动。EDSC的脂肪碳和芳香碳减少。EDSC热解焦油中中性化合物的含量增加了2.01wt%。CTHIS主要包括酚类、烷烃、芳烃和吡啶。EDSC-CTHIS 热解挥发物中的酚类化合物和含氮杂环化合物分别增加了 1.12 wt% 和 1.46 wt%。EDSC热解焦油中中性化合物的含量增加了2.01wt%。CTHIS主要包括酚类、烷烃、芳烃和吡啶。EDSC-CTHIS 热解挥发物中的酚类化合物和含氮杂环化合物分别增加了 1.12 wt% 和 1.46 wt%。EDSC热解焦油中中性化合物的含量增加了2.01wt%。CTHIS主要包括酚类、烷烃、芳烃和吡啶。EDSC-CTHIS 热解挥发物中的酚类化合物和含氮杂环化合物分别增加了 1.12 wt% 和 1.46 wt%。