Molecular structure characterization of middle-high rank coal via XRD, Raman and FTIR spectroscopy: Implications for coalification

Gas diffusion in coal particles: A review of mathematical models and their applications

Structure of some western Anatolia coals investigated by FTIR, Raman, 13C solid state NMR spectroscopy and X-ray diffraction

Macromolecular and pore structures of Chinese tectonically deformed coal studied by atomic force microscopy

Multifractal analysis of Hg pore size distributions of tectonically deformed coals

The structural parameters of nine coal samples from a contact metamorphic zone were studied by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The FTIR spectra parameters composed of CH2/CH3, fa, Hal/Har, and (R/C)u indicate distinguishing features, including increase of aromaticity and the loss of aliphatic and oxygen-containing groups with thermally metamorphic evolution of coal. The XRD analysis shows that magmatic intrusion potentially caused rapid changes of structures in coal. With the decrease of distances from the intrusion rocks, the average lateral sizes (La), stacking heights (Lc), and interlayer spacing (d002) of the crystallite structures of coal range from 22.90 to 37.70 A, 12.90 to 23.30 A, and 3.80 to 3.50 A, respectively. Exponential correlations are observed between structural parameters (fa, d002, La, Lc, Hal/H, (R/C)u, and Aar/Aal) and C/H of the coal, suggesting that the structures of coal are controlled by the degree of contact metamorphism.

Investigation of Structural Characteristics of Thermally Metamorphosed Coal by FTIR Spectroscopy and X-ray Diffraction

Influences of magmatic intrusion on the macromolecular and pore structures of coal: Evidences from Raman spectroscopy and atomic force microscopy

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Investigation of Structural Characteristics of Thermally Metamorphosed Coal by FTIR Spectroscopy and X-ray Diffraction

Influences of magmatic intrusion on the macromolecular and pore structures of coal: Evidences from Raman spectroscopy and atomic force microscopy