The adsorption kinetic characteristics of CH₄, CO₂, and N₂ in coal provide crucial information for increasing coal seam gas recovery. In this study, isothermal adsorption kinetics experiments were conducted using automatic high-pressure gas adsorption analyzer to reveal differences in adsorption kinetic characteristics of CH₄, CO₂, and N₂ in coal. The research shows that, before reaching adsorption equilibrium, the adsorption ratio of CO₂ was higher than that of N₂ while that of CH₄ was the smallest. The initial adsorption rates of CO₂, CH₄, and N₂ were 1998, 205, and 76 cm³ g⁻¹ h⁻¹, respectively. The order of decreasing gas adsorption rate with respect to the fluctuation zone was CO₂ → N₂ → CH₄. Before reaching adsorption equilibrium, the gas adsorption ratio at high temperature was higher than that at low temperature. The adsorption rates (R_t) of gas were divided into a rapid decay zone (R_t > 0.1 Q_e/h), slow decay zone (0.01 Q_e/h < R_t < 0.1 Q_e/h), and an adsorption equilibrium zone (|R_t| < 0.01 Q_e/h). Among the pseudo-first-order kinetic equation, the Fickian diffusion model and the dynamic diffusion model, the latter can best describe the adsorption kinetic process of coal. This work is expected to improve the theoretical basis of enhancing coal seam gas recovery and enrich the theory of gas adsorption in coal.

煤中CH ₄，CO ₂和N ₂的吸附动力学特性为提高煤层气采收率提供了关键信息。在这项研究中，使用自动高压气体吸附分析仪进行了等温吸附动力学实验，以揭示煤中CH ₄，CO ₂和N _2的吸附动力学特性的差异。研究表明，在达到吸附平衡之前，CO ₂的吸附率高于N _2，而CH ₄的吸附率最小。CO ₂，CH ₄和N的初始吸附率_2个分别是1998、205和76 cm ³  g ^-1  h ^-1。相对于变动区域，气体吸附率降低的顺序为CO ₂  →N ₂  →CH ₄。在达到吸附平衡之前，高温下的气体吸附率高于低温下的气体吸附率。气体的吸附速率（R _t）分为快速衰减区（R _t  > 0.1 Q _e / h），缓慢衰减区（0.01 Q _e / h <  R _t  <0.1 Q _e）/ h）和吸附平衡区（| R _t | <0.01 Q _e / h）。在伪一级动力学方程，菲克扩散模型和动态扩散模型中，后者可以最好地描述煤的吸附动力学过程。这项工作有望改善提高煤层瓦斯采收率的理论基础，并丰富煤中瓦斯吸附的理论。