Methane adsorption on a recuperated activated carbon, AR-V, was studied over the temperature range of 213–393 K and at pressures up to 10 MPa from the perspective of its potential application for adsorption-based storage and separation technologies. The porous structure, phase and chemical compositions of AR-V were examined by nitrogen adsorption at 77 K, x-ray diffraction, and scanning electron microscopy. The amount of adsorbed methane increased with pressure up to 6.3 mmol/g at 243 K and fell dramatically to ~ 1 mmol/g with a temperature rise to 393 K. The molar differential isosteric heat of methane adsorption on AR-V was evaluated from the linear isosteres within the studied P,T-range; the effects from the non-ideality of a gaseous phase and the AR-V non-inertness were considered. The maximal summarized contribution from the AR-V thermal expansion and directly measured adsorption-induced deformation to the molar differential isosteric heat of methane adsorption turned out to be less than that from the gas compressibility. The initial drastic changes in the thermodynamic state functions of the adsorption system were attributed to the binding methane molecules with non-uniformly distributed high-energy adsorption sites. When methane molecules occupied all high-energy adsorption sites, the subsequent variations in the thermodynamic functions were governed by the intensifying attractive forces between methane molecules upon methane adsorption resulting in the formation of adsorption clusters. The temperature dependence of the isosteric heat capacity of the methane/AR-V system varied during adsorption; its value exceeded 2–3 times the isochoric heat capacity of the equilibrium methane gaseous phase.

从其在基于吸附的存储和分离技术的潜在应用的角度来看，回收活性炭 AR-V 上的甲烷吸附在 213-393 K 的温度范围内和高达 10 MPa 的压力下进行了研究。通过 77 K 下的氮吸附、X 射线衍射和扫描电子显微镜检查 AR-V 的多孔结构、相和化学成分。吸附的甲烷量在 243 K 时随压力增加至 6.3 mmol/g，并在温度升至 393 K 时急剧下降至约 1 mmol/g。 AR-V 上甲烷吸附的摩尔微分等量热由所研究的P,T内的线性等排线-范围; 考虑了气相非理想性和 AR-V 非惰性的影响。AR-V 热膨胀和直接测量的吸附诱导变形对甲烷吸附的摩尔微分等量热的最大总结贡献结果小于气体压缩率。吸附系统热力学状态函数的初始剧烈变化归因于具有非均匀分布的高能吸附位点的结合甲烷分子。当甲烷分子占据所有高能吸附位点时，随后的热力学函数变化受甲烷吸附时甲烷分子之间增强的吸引力导致吸附簇的形成。甲烷/AR-V系统等量热容的温度依赖性在吸附过程中发生变化；它的值超过了平衡甲烷气相等容热容的 2-3 倍。