Raman spectrum characteristic and structural evolution of high rank coalscryptocrystalline graphite

Authors

LI Huantong, College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China; Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi’an 710054, China
WANG Nan, College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China
ZHU Zhirong, College of Geology and Environment, Xi’an University of Science and Technology,Xi’an 710054, China
FAN Jingjing, Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
ZHANG Weiguo, College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China; Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi’an 710054, China

Abstract

Raman spectroscopy can reflect the order degree and structural defects of carbon materials, and can be used to characterize the structural changes during the evolution of high rank coal-cryptocrystalline graphite, and analyze the relationship between Raman parameters of coal with different deformation and metamorphic degrees and the spacing of surface network(d002). The results showed that: (1) there was stepped variation between the G peak position and d002, but the graphite and high rank coal could be distinguished well. The S2 peak, the full width at half maximum of D1 and G had a good linear relationship with d002; (2) the peak difference between D1 and G and the full width at half maximum ratio decreased with the decrease of d002; the peak difference between S2 and S4 increased first and then decreased with the decrease of d002, while the intensity ratio and area ratio increased gradually; (3) the relationship of interlayer spacing(d002) and Raman parameters figure shows the structure of two obvious evolutionary step, namely anthracite to ultra-anthracite (Rmax＞6.5 %, P(D1-G)＜235 cm-1, P(S2-S4)＞ 525 cm-1 and half peak width ratio dropped significantly, La/Lc reduce 2-3 times), semi-graphite to graphite evolutionary stages (P(D1-G), ID1/IG, AD1/AG significantly reduced; La, Lc increase rapidly). The Raman spectral characteristics of coal structure at different evolution stages can be well reflected by taking d002 as the scale.

Keywords

high rank coals, cryptocrystalline graphite, structural evolution, XRD, Raman spectrum, mutation

DOI

10.3969/j.issn.10011986.2020.01.005

Recommended Citation

LI Huantong, WANG Nan, ZHU Zhirong, et al. (2020) "Raman spectrum characteristic and structural evolution of high rank coalscryptocrystalline graphite," Coal Geology & Exploration: Vol. 48: Iss. 1, Article 6.
DOI: 10.3969/j.issn.10011986.2020.01.005
Available at: https://cge.researchcommons.org/journal/vol48/iss1/6

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