ArticleScientific reports2026
Influence mechanism of pre-oxidation on the secondary oxidation characteristics of coal: insights from TG-DSC-FTIR analysis.
Article in Scientific reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The secondary oxidation behavior of coal represents a critical process governing its spontaneous combustion propensity and pollutant emissions. To elucidate the influence mechanism of pre-oxidation on the secondary oxidation characteristics of coal, this study selected raw coal from Dananhu, Xinjiang (DNH) as the research subject. Pre-oxidized coal samples (DNH-80) were prepared via temperature-programmed heating to 80 °C with isothermal holding for 1 h. The thermal behavior, reaction kinetics, and Gas emissions characteristics of both coal samples were systematically investigated using thermogravimetry-differential scanning calorimetry-Fourier transform infrared spectroscopy (TG-DSC-FTIR) at three heating rates (5, 8, and 12 K/min). The results demonstrate that pre-oxidation treatment significantly altered the physicochemical properties of coal: proximate analysis revealed a substantial decrease in moisture content from 11.56% to 1.38%, accompanied by significant increases in fixed carbon and volatile matter contents. Fourier transform infrared (FTIR) spectroscopy further confirmed substantial microstructural alterations, characterized by a marked increase in oxygen-containing functional groups (e.g., carbonyl C=O) and a reorganization of aliphatic structures. Kinetic analysis revealed that the apparent activation energy of pre-oxidized coal during the main combustion stage (conversion degree of 0.2-0.6) was systematically lower than that of raw coal, indicating a marked enhancement in reactivity. Thermal analysis data further confirmed that pre-oxidized coal exhibited more intense combustion behavior, with its maximum mass loss rate (DTG
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