Effects of Metamorphism and Deformation on the Coal Macromolecular Structure by Laser Raman Spectroscopy

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• 作者：Jienan PanMinmin Lv ; Heling Bai ; Quanlin Hou ; Meng Li ; Zhenzhi Wang
• 刊名：Energy & Fuels
• 出版年：2017
• 出版时间：February 16, 2017
• 年：2017
• 卷：31
• 期：2
• 页码：1136-1146
• 全文大小：596K
• ISSN：1520-5029

文摘

Metamorphism and deformation significantly affect the macromolecular structure of coal. In this study, experiments were conducted using coal samples with different metamorphic degrees and deformation types from different regions of Hebei, Henan, Shanxi, and Anhui province, followed by laser Raman spectral analysis. The results indicated that the Raman spectrum of all coal samples consist of two characteristic peaks, namely the D peak and the G peak, ranging from 1336.7 cm^–1 to 1360 cm^–1 and from 1591.2 cm^–1 to 1600.6 cm^–1, respectively. Simultaneously, with the metamorphic degree of coal increasing, certain change rules were observed in both strong and weak tectonically deformed coals: G and D peaks were gradually separated and the sharpness of these peaks was clearly enhanced. In addition, the D-peak position, full width at half maximum for the G-peak (fwhm-G), and the intensity ratio between the D and G-peaks (I_D/I_G) decreased, but the G-peak position and d(G–D) values increased, while the analysis results indicated that the change trends in the d(G–D) values can serve as a measure of the change trends in the metamorphic degree of coal. Meanwhile, tectonic deformation can somewhat promote the order degree of the aromatic structure in the internal microscopic structure of coal, and the effects of tectonic deformation on macromolecular structure of coal are even greater than those of high metamorphic stage in the low metamorphic stage.