Department of Chemical Engineering, and ‡Department of Chemistry, Istanbul Technical University , Maslak, Istanbul 34469, Turkey.
ACS Appl Mater Interfaces. 2017 Oct 18;9(41):35936-35946. doi: 10.1021/acsami.7b13054. Epub 2017 Oct 9.
Microporous metal-imidazolate framework (MMIF), a highly CO selective MOF, was incoporated into a polymeric membrane for separation of CO from CH and N for the first time. MMIF nanoparticles of 50-200 nm were synthesized using the sonication method and dispersed into Matrimid, a commercial polyimide, with MOF loading of 10% and 20% by weight to fabricate mixed matrix membranes (MMMs). Morphology, thermal behavior, and glass transition temperature of the membranes were characterized, and single and mixed gas permeation measurements at 35 °C and 4 bar feed pressure were carried out to reveal their separation performance. Both 10% and 20% MMIF containing Matrimid membranes exhibited enhanced gas permeabilities for all three gases. Contrary to expectations, ideal selectivity of membranes was not improved possibly due to the flexible framework of MMIF. On the other hand, mixed gas permeability measurements showed significant improvement in CO/CH separation factor by 130% and CO/N separation factor by 79% due to competitive adsorption favoring CO.
微孔金属-咪唑骨架（MMIF）是一种高度 CO 选择性的 MOF，首次被掺入聚合物膜中，用于从 CH 和 N 中分离 CO。使用超声法合成了 50-200nm 的 MMIF 纳米粒子，并将其分散到商用聚酰亚胺 Matrimid 中，MOF 负载量为 10%和 20%，以制备混合基质膜（MMMs）。对膜的形态、热行为和玻璃化转变温度进行了表征，并在 35°C 和 4 巴进料压力下进行了单组分和混合气体渗透测量，以揭示其分离性能。含有 10%和 20% MMIF 的 Matrimid 膜均表现出所有三种气体的渗透性显著提高。与预期相反，由于 MMIF 的柔性骨架，膜的理想选择性并没有提高。另一方面，由于竞争吸附有利于 CO，混合气体渗透性测量显示 CO/CH 分离因子提高了 130%，CO/N 分离因子提高了 79%。
