Authors: A.A. Fofanov

Title of the article: Features of methane adsorption on a microporous surface in the structure of coal

Year: 2025, Issue: 4, Pages: 84-90

Branch of knowledge: 2.8.6. Geomechanics, destruction of rocks by explosion, mine aerogasdynamics and mining thermophysics

Index UDK: 622.831.322

DOI: 10.26730/1999-4125-2025-4-84-90

Abstract: The production needs associated with the consumption of coal as an energy source lead to the need to increase the pace of coal production, thereby mining formations at great depths. As the depth of the mined coal seams increases, their natural gas content increases. This increases the likelihood of sudden emissions of coal and gas. The key factors that determine the occurrence of sudden emissions of coal and gas are the gas content of the reservoir, the structure of the coal and the rock pressure, depending on the depth of the reservoir. Since coal is a highly porous substance, its structure is determined by the distribution of pores into different types and sizes. The pores are filled with mine gas, which consists of a mixture of various gases. The largest proportion of them is methane, the concentration of which is more than 80%. The distribution of pores in coal is such that micropores in it make up a large part and can make a significant contribution to the processes of additional gas release. At the same time, the mechanism of interaction of methane molecules with the surface of the micropore and the energy of their intermolecular bonding are not given by the authors. Based on the above, it can be concluded that at the moment the issues of the dependence of the binding energy of a methane molecule with a microporous coal surface on the orientation of its dipole moments formed by C-H bonds relative to the surface are poorly understood and relevant. The article considers a physical model of the interaction of methane molecules with a carbon atom, which is located in a coal substance. The model allows us to establish the dependence of the binding energy of a methane molecule with a microporous coal surface on the orientation of its dipole moments formed by C-H bonds relative to the surface. The energy of interaction of a methane molecule with the surface of a micropore is calculated and a condition for a stable configuration of the position of the methane molecule relative to the carbon atom in the structure of the microporous surface of coal is obtained, at which the energy has a maximum value

Key words: hydrogen atom carbon atom coal micropore surfaces interaction energy orientation relative to the surface rotation angle normal to the surface

Receiving date: 12.05.2025

Approval date: 22.06.2025

Publication date: 28.08.2025

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