FTIR and 13C NMR Investigation of Coal Component of Late Permian Coals from Southern China

详细信息    查看全文

• 作者：Shaoqing Wang ; Yuegang Tang ; Harold H. Schobert ; Ya鈥檔an Guo ; Yufei Su
• 刊名：Energy & Fuels
• 出版年：2011
• 出版时间：December 15, 2011
• 年：2011
• 卷：25
• 期：12
• 页码：5672-5677
• 全文大小：769K
• 年卷期：v.25,no.12(December 15, 2011)
• ISSN：1520-5029

文摘

Two separated components, vitrinite and barkinite, and one associated coal sample obtained from South China were studied by Fourier transform infrared spectroscopy (FTIR) and carbon-13 nuclear magnetic resonance (¹³C NMR) with curve-fitting analysis to obtain information on the concentrations of several functionalities in the samples. These two components were also studied in situ in coal by micro-FTIR. Some parameters derived from FTIR, micro-FTIR, and ¹³C NMR were selected to obtain a better understanding of the chemical structure of barkinite. All the FTIR and ¹³C NMR spectra and the values of I₁ and I₂ show that the most distinct structural feature of barkinite is a rich concentration of aliphatic structures. Furthermore, the aliphatic structures are longer and less branched. Oxygen is mainly bound to aliphatic carbon. For barkinite, the ratio of integrated areas of 3000鈥?700 cm^鈥? and 3100鈥?000 cm^鈥? regions of FTIR spectra suggest that its aliphatic hydrogen concentration is larger than its aromatic hydrogen concentration. In the aromatic structures, barkinite has a higher ratio of integrated areas of 900鈥?00 cm^鈥? to 1600 cm^鈥? than vitrinite, and the aromatic ring number per cluster is mainly 2 or 3. In addition, the intensity of the aliphatic peaks relative to the aromatic peaks (the A factor) of barkinite shows that barkinite can be inferred to be a type I kerogen and that barkinite has good hydrocarbon-generating potential.