A series of granular activated carbon (GAC) samples with similar surface chemical properties but different pore structures were prepared from anthracite. The maximum adsorption capacities of the prepared CO₂, CH₄, and N₂ at 298 K and 2.0 MPa were 4.27 mmol/g, 2.54 mmol/g, and 1.46 mmol/g, respectively, and the adsorption selectivity parameters, i.e., \({\alpha _{C{H_4},\,{N_2}}}\) and \({\alpha _{C{O_{2,}}\,C{H_4}}}\), were 3.23 and 3.06, respectively. By using the GAC with the optimum pore size as adsorbent, the concentration of methane in the nitrogen-methane (CH₄/N₂) mixture was concentrated from 30% to 63.5% via a single-column single-cycle pressure swing adsorption (PSA) process. The pore size distribution of the GAC samples was dominated by micropores, with specific surface area in the range of 330–500 m²/g and micropore volume in the range of 0.12–0.19 cm³/g. Although the specific surface area and pore volume of micropores played an important role in the separation performance, the pore size distribution was found to be the decisive factor. In particular, the micropores with sizes in the range of 5.0–10.0 Å were the main factor affecting the concentrating effect of CH₄ or CO₂ by GAC.

由无烟煤制备了一系列表面化学性质相似但孔隙结构不同的颗粒活性炭 (GAC) 样品。制备的CO ₂、CH ₄和N ₂在298 K和2.0 MPa下的最大吸附量分别为4.27 mmol/g、2.54 mmol/g和1.46 mmol/g，吸附选择性参数为\ ({\alpha _{C{H_4},\,{N_2}}}\)和\({\alpha _{C{O_{2,}}\,C{H_4}}}\)分别为 3.23 和3.06，分别。通过使用具有最佳孔径的GAC作为吸附剂，氮甲烷中的甲烷浓度（CH ₄ /N ₂) 混合物通过单柱单循环变压吸附 (PSA) 工艺从 30% 浓缩至 63.5%。GAC样品的孔径分布以微孔为主，比表面积范围为330~500 m ² /g，微孔体积范围为0.12~0.19 cm ³ /g。尽管微孔的比表面积和孔体积对分离性能起着重要作用，但孔径分布被发现是决定性因素。特别是，尺寸在5.0-10.0 Å范围内的微孔是影响GAC对CH ₄或CO ₂的浓缩效果的主要因素。