Bezruchko K., Pymonenko L., Baranovskyi V., Kargapolov A., Chelkan V. Geological factors affecting the sorption properties of coal
- Details
- Parent Category: Geo-Technical Mechanics, 2025
- Category: Geo-Technical Mechanics, 2025, Issue 172
Geoteсh. meh. 2025, 172, 158-171
GEOLOGICAL FACTORS AFFECTING THE SORPTION PROPERTIES OF COAL
1M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine
UDC 553.98:662.74
Language: English
Abstract. The sorption capacity of coal is a crucial characteristic for evaluating its gas content, the safety of mining operations, and the environmental impact of methane emissions. Effective coal degassing reduces the risks of sudden outbursts and decreases the volume of greenhouse gas emissions into the atmosphere. Existing methods for determining sorption capacity are labor-intensive and expensive, which limits their use. There is also no clear understanding of the influence of regional and local geological factors on the sorption properties of coal.
Research objective: to investigate the sorption properties of coal samples from various mines and coal beds in the Donets Basin using EPR spectroscopy and to identify the factors influencing the sorption capacity of the coal matter. The total number of researched samples is 45, ranging from grade LF to grade L. The selection of different beds within the same grade allowed determining the impact of lithofacies conditions on the sorption capacity of coal, and from different mines – thermodynamic processes; comparison of indicators from samples taken from disturbed and undisturbed areas – tectonic processes. Research on the impact of geological factors on the sorption properties of coal matter was performed using EPR-spectroscopy and petrography through the evaluation of changes caused by external factors in the structure and texture of fossil organics at the nano- and microlevels. It is shown that with increasing metamorphism (from brown coal to anthracite), the volatile matter content and oxygen groups decrease, carbonization increases, and micro- and mesoporosity changes. The best sorption properties are observed at the average degree of metamorphism, when functional groups and porous structure are preserved. Further graphitization reduces surface activity. Differences in sorption capacity within a bed are caused by tectonic influences, and between beds – by lithofacies conditions. Tectonics forms cracks and pores, changing permeability. Lithofacies influence the initial properties of coal matter: ash content, sulfur content, and composition. The use of EPR-spectroscopy for researching the formation of coal matter properties allows for the effective, rapid, and sufficiently accurate definition of the sorption capacity of coalified organic matter taking into account the specific impact of regional and lithofacial factors on the properties and state of coal.
Keywords: coal matter, sorption properties, geological factors, EPR-spectroscopy, petrographic studies.
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About the authors:
Bezruchko Kostiantyn, Doctor of Geology Science, Senior Researcher, M.S. Poliakov Institute of Geotechnical Mechanicsof the National Academy of Sciences of Ukraine (IGTM of the NAS of Ukraine), Head of Department of Geology of Coal Beds at Great Depths, Dnipro, Ukraine,
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(Corresponding author)
Pymonenko Liudmyla,Doctor of Geology Science, Senior Research Fellow,M.S. Poliakov Institute of Geotechnical Mechanicsof the National Academy of Sciences of Ukraine (IGTM of the NAS of Ukraine), Head of Department of Geology of Coal Beds at Great Depths, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.
Baranovskyi Volodymyr,Junior researcher, M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine (IGTM of the NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.
Karhapolov Andrii,Candidate of Techical Sciences (Ph.D.), Researcher of Geology of Coal Beds at Great Depths, M.S. Poliakov Institute of Geotechnical Mechanics under the National Academy of Sciences of Ukraine (IGTM NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.
Chelkan Vira, Engineer of Department of Geology of Coal Beds at Great Depths, M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine (IGTM of the NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.