采用重量法测定了298、303、308、313K 下CH₄ 、CO₂在 MIL-101 多孔材料上的吸附等温线，估算了MIL-101 对CH₄ 、CO₂的等量吸附热，并利用 DL- IAST 模型计算出不同温度下 CH₄ /CO₂混合气中各组分的吸附分量，探讨了CO₂的吸附选择性．结果表明:298 K、2500kPa 时，CO₂ 在 MIL-101 上的吸附量为14．51mmol/g，远高于同等条件下商业活性炭、沸石和分子筛对 CO₂的吸附容量;CH₄、CO₂在 MIL-101 上的吸附等温线与 Double- Langmuir模型吻合很好，说明该吸附主要为双孔位吸附;CO₂在 MIL-101 上的等量吸附热在19．3 ～25．5kJ/mol 范围内;与 CH₄相比，CO₂在 MIL-101 上的表面自由结合能更高;298K、250kPa时，MIL-101 对 CO₂的吸附选择性指数为 5．6;随着压力的增大， CO₂的吸附选择性逐渐减小;随着混合气中 CO₂浓度的下降， CO₂的吸附选择性上升．

In this paper,the adsorption isotherms of CH₄ and CO₂ on MIL-101 were obtained by means of the gravi-metric method at 298,303,308 and 313K,and the corresponding isosteric adsorption heat was estimated.Then,the pure gas adsorption was calculated by using the DL- IAST model,and the adsorption selectivity of CO₂ on MIL-101was discussed.The results show that (1) the adsorption capacity of pure CO₂ on MIL-101 is up to 14.51mmol/g at298K and 2500kPa,which is much higher than that on activated carbon,zeolite and molecular sieve under similarconditions; (2) the isotherms of pure CO₂ and CH₄ well accord with the Double- Langmuir model,which shows thepresence of two adsorption sites; (3) the isosteric adsorption heat of CO₂ on MIL-101 ranges from 19,3 to 25,5kJ/mol;(4) as compared with CH ₄ ,CO₂ is of higher surface free energy for its interaction with the framework of MIL-101;(5) the adsorption selectivity index of CO₂ over CH₄ on MIL-101 is up to 5.6 at 298K and 250kPa; and (6) theadsorption selectivity of CO₂ over CH₄ gradually decreases with the increase of pressure and the concentration of CO₂ in CH₄ /CO₂ mixture.