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Interaction of Freshly Exposed Low- and Medium-Grade Coal with the Air

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Abstract

The chemical composition of low- and medium grade Russian coal (ranks G, DZh, and Zh) on first exposure to the air is analyzed. The changes in the coal’s organic matter are recorded by means of diffuse-reflection infrared (IR) spectroscopy, electron paramagnetic resonance (EPR), and nuclear magnetic resonance (NMR) spectroscopy. The variation in the number of paramagnetic centers and functional groups shows that the most significant changes in the structural fragments and surface layer of the coal occur within hours of exposure. Without further disturbance, residence in air for several days is accompanied by slow accumulation and loss of the radicals and the formation of functional O groups. For coal of low and moderate metamorphic development, •CH alkyl radicals and CO• phenyl and alkyl ester radicals react most with atmospheric oxygen.

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ACKNOWLEDGMENTS

We thank our colleagues at the Federal Research Center of Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences for assistance in the physicochemical analysis: T.A. Panina, A.V. Anikina, A.V. Yarkova, and E.S. Nepeina (Coal Institute) and S.A. Sozinov (Collective Use Center).

Funding

State support was provided to the Federal Research Center of Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences (project FWEZ-2021-0002) for development of effective robotic coal mining systems that do not need constant human supervision at the rock face and of control systems and methods of assessing the condition of such systems and predicting their working life, within the scope of efficient resource extraction (registration number AAAA-A21-121012290021-1).

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Authors and Affiliations

  1. Coal Institute, Federal Research Center of Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences, Kemerovo, Russia

    S. A. Semenova & Yu. F. Patrakov

  2. Collective Use Center, Federal Research Center of Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences, Kemerovo, Russia

    S. Yu. Lyrshchikov & N. S. Zakharov

Authors
  1. S. A. Semenova
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  2. Yu. F. Patrakov
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  3. S. Yu. Lyrshchikov
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  4. N. S. Zakharov
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Corresponding authors

Correspondence to S. A. Semenova, Yu. F. Patrakov, S. Yu. Lyrshchikov or N. S. Zakharov.

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The authors declare that they have no conflicts of interest.

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Translated by B. Gilbert

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Semenova, S.A., Patrakov, Y.F., Lyrshchikov, S.Y. et al. Interaction of Freshly Exposed Low- and Medium-Grade Coal with the Air. Coke Chem. 66, 187–195 (2023). https://doi.org/10.3103/S1068364X23700709

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