![]() ![]() Physical methods include Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and carbon nuclear magnetic resonance ( 13C-NMR) spectroscopy. Presently, methods used by scholars mainly include physics (instrumental analysis), chemistry, and molecular simulation. A clear understanding of the molecular structure and oxidation combustion characteristics of coal is highly important for the clean utilization, efficient conversion, and comprehensive utilization of coal as well as for the prevention of the spontaneous combustion of coal. The HRTEM results showed the aromatic fringes in coal samples were dominated by 1 × 1 and 2 × 2, the contents of which accounted for more than 80% of the total fringes.Ĭoal is not only the major energy source, but also is one source of pollution during utilization of it. The C-O showed increasing trends, whereas the C=O decreased consistently. The aliphatic hydrocarbons changed greatly at 30–150 ☌ and 300–500 ☌. The FTIR results showed the contents of self-associated OH changed greatly. The activation energy change pattern of 4 stages is not obvious. Thermogravimetric analysis results showed the critical and dry-cracking temperatures of coal samples showed downward trends overall, whereas the acceleration and thermal-decomposition temperatures varied greatly with increase in oxidation temperature. The stable 3D structural was obtained through optimization. The molecular structural formula is C 142H 112N 2O 22. ![]() Oxygen, nitrogen, and sulphur existed as C-O, pyridine, pyrrole nitrogen, aliphatic sulphur, and sulfone. The aliphatic hydrocarbons were long chain. The results showed the aromatic structure was mainly naphthalene. In this study, the authors investigated the characteristics of spontaneous combustion of coal at different temperatures (room temperature, 50–500 ☌ with 50 ☌ interval) using Fourier transform infrared spectroscopy (FTIR), high-resolution transmission electron microscopy (HRTEM), etc. The spontaneous combustion of coal is a disaster associated with coal mining. ![]()
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