Physicochemical properties of CO₂, CH₄ and N₂.

<div> The study of the adsorption characteristics of coal is of great significance to gas prevention and CO₂ geological storage. To explore the adsorption mechanism of coal, this study focuses on columnar anthracite. Adsorption tests on coal rock under a range of physical field conditions were conducted using the volumetric method. The adsorption characteristics of anthracite for CO₂, CH₄, and N₂ gases under different conditions were investigated using Grand Canonical Monte Carlo (GCMC) and Molecular Dynamics (MD) methods. The results showed that the adsorption capacities of anthracite for these three gases are in the order of CO₂ > CH₄ > N₂, and that the adsorption capacity increases with increasing gas injection pressure. The CO₂/CH₄/N₂ gas molecule adsorption capacity of the anthracite macromolecular structure model decreases with increasing temperature. The increase in temperature has the greatest influence on the CO₂ absorption capacity, followed by the CH₄ and N₂ adsorption capacities. The research offers a theoretical basis for the control of coal mine gas and the geological storage of CO₂. </div>