Abstract

Data on the analysis of the chemical composition and physicochemical properties of native low-metamorphosed coal at the initial moment of its contact with the air are presented. Diffuse reflectance IR spectroscopy, EPR spectroscopy, NMR spectroscopy, gas chromatography, chemical analysis of oxygen-containing groups, and the determination of the specific surface area and wettability of the contacting surface were used to identify changes in the organic matter of coal. The dynamics of changes in the numbers of paramagnetic centers and functional groups showed that the most intense transformations in the surface layer occurred in the first day of coal exposure to air. Next, oxidation at room temperature proceeded in a periodic mode of the accumulation and consumption of radicals and functional O groups. After four days, the process of low-temperature oxidation passed from the accessible outer surface into the diffusion region of the porous space of coal and gradually slowed down.

中文翻译：

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原生低变质煤与空气接触性质的变化

摘要

介绍了原生低变质煤与空气接触初期的化学成分和物理化学性质分析数据。采用漫反射红外光谱、EPR光谱、核磁共振光谱、气相色谱、含氧基团的化学分析以及比表面积和接触面润湿性的测定来识别煤中有机质的变化。顺磁中心和官能团数量的动态变化表明，表层中最强烈的转变发生在煤暴露于空气的第一天。接下来，室温下的氧化以自由基和官能团 O 基团的积累和消耗的周期性模式进行。四天后，