XRD spectrogram.

(a) X-ray diffractogram of the anthracite coal sample, (b) XRD-002 Peak Fitting Map of Anthracite.</p

Cellular model of the molecular structure of anthracite.

Cellular model of the molecular structure of anthracite.</p

FT-IR spectra of anthracite.

FT-IR spectra of anthracite.</p

Molecular model of anthracite coal.

(a) 2D structure, (b) 3D optimized structure.</p

13C NMR peak fitting spectra of anthracite.

13C NMR peak fitting spectra of anthracite.</p

FT-IR fitting spectra of anthracite in 3000–2800 cm^-1 band.

FT-IR fitting spectra of anthracite in 3000–2800 cm-1 band.</p

XRD structural parameters of anthracite coal.

XRD structural parameters of anthracite coal.</p

Comparison of 13C NMR experimental spectra and model predictive spectra of anthracite.

Comparison of 13C NMR experimental spectra and model predictive spectra of anthracite.</p

Existence form of aromatic carbon in the anthracite configuration.

Existence form of aromatic carbon in the anthracite configuration.</p

FT-IR fitting spectra of anthracite in 900–700 cm^-1 band.

FT-IR fitting spectra of anthracite in 900–700 cm-1 band.</p