英国曼彻斯特大学Martin Schröder团队报道了利用主客体相互作用介导的金属有机骨架纯化丙烯和乙烯。相关研究成果发表在2021年4月7日出版的《德国应用化学》。

丙烯和乙烯的工业提纯需要低温蒸馏和钯催化剂上的选择性氢化，以去除丙烷、乙烷和/或微量乙炔。

该文中，研究人员报告了一种高度坚固的微孔材料MFM-520在动态条件下对丙烯/丙烷和乙烯/乙烷等摩尔混合物以及1/100的乙炔/乙烯混合物获得了良好的分离效果。原位同步辐射单晶X射线衍射、非弹性中子散射和吸附热力学参数分析表明，一系列包括氢键和ππ堆积相互作用的协同主客体相互作用是烯烃在孔内协同结合的基础。

值得注意的是，该材料的最佳孔隙几何形状能够选择性调节乙炔。这种多孔材料的实际潜力已通过制造混合基质膜（包括MFM-520、Matrimid和PIM-1）得到证实，这些膜不仅对丙烯具有高渗透性（~1984 Barrer），而且在298 K时，丙烯/丙烷等摩尔混合物的分离因子为7.8。

附：英文原文

Title: Purification of propylene and ethylene by a robust metal‐organic framework mediated by host‐guest interactions

Author: Martin Schr, Jiangnan Li, Xue Han, Xinchen Kang, Yinlin Chen, Shaojun Xu, Gemma L. Smith, Evan Tillotson, Yongqiang Cheng, Laura McCormick McPherson, Simon J. Teat, Svemir Rudic, Anibal J. Ramirez-Cuesta, Sarah J. Haigh, Sihai Yang

Issue&Volume: 2021-04-07

Abstract: Industrial purification of propylene and ethylene requires cryogenic distillation and selective hydrogenation over palladium catalysts to remove propane, ethane and/or trace amounts of acetylene. Here, we report the excellent separation of equimolar mixtures of propylene/propane and ethylene/ethane, and of a 1/100 mixture of acetylene/ethylene by a highly robust microporous material, MFM‐520, under dynamic conditions. In situ synchrotron single crystal X‐ray diffraction, inelastic neutron scattering and analysis of adsorption thermodynamic parameters reveal that a series of synergistic host‐guest interactions involving hydrogen bonding and ππ stacking interactions underpin the cooperative binding of alkenes within the pore. Notably, the optimal pore geometry of the material enables selective accommodation of acetylene. The practical potential of this porous material has been demonstrated by fabricating mixed‐matrix membranes comprising MFM‐520, Matrimid and PIM‐1, and these exhibit not only a high permeability for propylene (~1984 Barrer), but also a separation factor of 7.8 for an equimolar mixture of propylene/propane at 298 K.

DOI: 10.1002/anie.202103936

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202103936