Structural Evolution and Thermal Reactivity of Kerke Coal: Molecular Model Construction and Multi-Technique Characterization
- 1Center for Underground Coal Fire, College of Ecology and Environment, Xinjiang University, Urumqi 830017, China
- 2Key Laboratory of Oasis Ecology of Ministry of Education, Xinjiang University, Urumqi 830017, China
Abstract
To clarify the structural evolution and thermal reactivity of Yili Kerke coal, raw and heat-treated samples were analyzed. Characterization combined proximate and ultimate analyses, TG, FTIR, XPS, 13C-NMR, and HRTEM. A molecular model with the formula C179H132N2O13 was constructed from multiscale structural parameters to represent the average chemical structure of Kerke raw coal. After classical molecular mechanics (MM) and molecular dynamics (MD) optimization, the lowest-energy configuration sampled had a total energy of 661.38 kcal mol−1. The periodic aggregate model had a density of 1.31 g cm−3. The ignition and burnout temperatures of the coal samples generally increased after thermal treatment. The microstructural evolution exhibited distinct stages. At low temperatures, aromatic carbon dominated, with adjustments in functional group and aromatic fringe distributions. At medium temperatures, oxygen-containing components and aromatic carbon types were redistributed, and the proportion of short fringes increased. At high temperatures, aromatic structures became more concentrated, aliphatic carbon decreased, and the proportion of larger aromatic fringes increased overall. Macroscopic thermal analysis and microstructural characterization jointly reveal that molecular structural evolution is consistent with thermal reaction characteristics at different stages. These findings provided a molecular-scale basis for understanding the oxidative thermal behavior of Kerke coal.
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BibTeX
@article{gao2026structural,
title = {{Structural Evolution and Thermal Reactivity of Kerke Coal: Molecular Model Construction and Multi-Technique Characterization}},
author = {Xiaohong Gao and Qiang Zeng},
journal = {Molecules},
year = {2026},
month = oct,
doi = {10.3390/molecules31203755},
url = {https://www.mdpi.com/1420-3049/31/20/3755},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Structural Evolution and Thermal Reactivity of Kerke Coal: Molecular Model Construction and Multi-Technique Characterization
AU - Xiaohong Gao
AU - Qiang Zeng
PY - 2026
DA - 2026/10/01
JO - Molecules
DO - 10.3390/molecules31203755
UR - https://www.mdpi.com/1420-3049/31/20/3755
AB - To clarify the structural evolution and thermal reactivity of Yili Kerke coal, raw and heat-treated samples were analyzed. Characterization combined proximate and ultimate analyses, TG, FTIR, XPS, 13C-NMR, and HRTEM. A molecular model with the formula C179H132N2O13 was constructed from multiscale structural parameters to represent the average chemical structure of Kerke raw coal. After classical molecular mechanics (MM) and molecular dynamics (MD) optimization, the lowest-energy configuration sampled had a total energy of 661.38 kcal mol−1. The periodic aggregate model had a density of 1.31 g cm−3. The ignition and burnout temperatures of the coal samples generally increased after thermal treatment. The microstructural evolution exhibited distinct stages. At low temperatures, aromatic carbon dominated, with adjustments in functional group and aromatic fringe distributions. At medium temperatures, oxygen-containing components and aromatic carbon types were redistributed, and the proportion of short fringes increased. At high temperatures, aromatic structures became more concentrated, aliphatic carbon decreased, and the proportion of larger aromatic fringes increased overall. Macroscopic thermal analysis and microstructural characterization jointly reveal that molecular structural evolution is consistent with thermal reaction characteristics at different stages. These findings provided a molecular-scale basis for understanding the oxidative thermal behavior of Kerke coal.
SN - 1420-3049
ER -