Mixed-Matrix Membranes of the Air-Stable MOF-5 Analogue [Co-4(mu(4)-0)(Me(2)pzba)(3)] with a Mixed-Functional Pyrazolate-Carboxylate Linker for CO2/CH4 Separation

作者：Dechnik Janina^*; Nuhnen Alexander; Janiak Christoph

来源：Crystal Growth & Design, 2017, 17(8): 4090-4099.

DOI：10.1021/acs.cgd.7b00202

The synthesis of the isostructural MOF-5 analogue 3D-[Co-4(mu(4)-O)(Me(2)pzba)(3)] with the bi- or mixed-functional pyrazolate-carboxylate linker was improved by the use of microwave heating instead of previously described conventional thermal heating, giving a higher yield at drastically shorter reaction time with nearly doubled BET surface area, smaller size, and less aggregation. The significantly increased air/moisture stability of [Co-4(mu(4)-O)(Me(2)pzba)(3)] compared to MOF-5 made the Co-MOF amenable for the preparation of moisture-tolerant [Co-4(mu(4)-O)(Me(2)pzba)(3)]/Matrimid mixed-matrix membranes (MMMs) without the use of inert conditions. Uniformly embedding of the small metal-organic framework (MOF) particles was achieved in the polymer, without aggregation and with good MOF-polymer compatibility. [Co-4(mu(4)-O)(Me(2)pzba)(3)]/Matrimid MMMs exhibited an improved CO2/CH4 separation performance over neat Matrimid membranes with an increase in mixed -gas selectivity from 41 for Matrimid to 60 for the 24 wt % MMM at 3 bar transmembrane pressure, which is also higher than reported for moisture -sensitive MOF-5/Matrimid MMMs (maximal S = 45).

• 出版日期2017-8