Propene (C₃H₆)/propane (C₃H₈) separation is an important but challenging industrial task. Adsorptive separation using porous materials tends to be an energy- and cost-effective strategy. In this work, a flexible porous MOF named NJU-Bai8 is demonstrated to be a promising adsorbent for the effective separation of C₃H₆ and C₃H₈ in a wide temperature range from 298 to 348 K due to its flexible microporous structure, which provides unique guest responsive molecule accommodation. Adsorption isotherms, ideal adsorbed solution theory (IAST) prediction of separation ability, and transient breakthrough on both simulation and experiment were performed to evaluate its separation selectivity and cycling experiments were carried out to explore its structural stability. It was found that the C₃H₆/C₃H₈ uptake ratio and IAST selectivity of NJU-Bai8 is 43.2 and 4.6 at 298 K and 20 kPa, respectively. The breakthrough time interval for C₃H₆ and C₃H₈ is over 10 min for a C₃H₆/C₃H₈/He (20%/20%/60%) mixture under ambient conditions, and this separation ability can maintain more than 10 cycles. Detailed analysis reveals that a guest-dependent pressure induced gate-opening effect in the flexible framework of this MOF is indeed responsible for the observed unique selective adsorption and separation performances. This material also shows good regenerability, being favorable for possible industrial application.

丙烯（C ₃ H ₆）/丙烷（C ₃ H ₈）的分离是一项重要但具有挑战性的工业任务。使用多孔材料的吸附分离往往是一种节省能源和成本的策略。在这项工作中，名为NJU-Bai8的柔性多孔MOF被证明是有效分离C ₃ H ₆和C ₃ H ₈的有前途的吸附剂。由于其灵活的微孔结构，可在298至348 K的宽温度范围内保持稳定，可提供独特的客体响应性分子适应性。进行了吸附等温线，理想吸附溶液理论（IAST）预测分离能力以及在模拟和实验上的瞬时突破，以评估其分离选择性，并进行了循环实验以探讨其结构稳定性。结果发现，NJU-Bai8的C ₃ H ₆ / C ₃ H ₈吸收率和IAST选择性在298 K和20 kPa时分别为43.2和4.6。C ₃ H ₆和C ₃ H ₈的突破时间间隔对于C ₃ H ₆ / C ₃ H ₈ / He（20％/ 20％/ 60％）混合物，在环境条件下超过10分钟，这种分离能力可以维持10个以上的循环。详细的分析表明，在此MOF的灵活框架中，依赖于来宾的压力引起的开门效应确实是所观察到的独特的选择性吸附和分离性能的原因。该材料还显示出良好的可再生性，有利于可能的工业应用。