Mixed-matrix membranes containing MOF-5 for gas separations

Metal-organic framework 5 (MOF-5) nanocrystals with a high surface area (3000 m2/g) and high thermal stability (up to 400 °C) were synthesized and added to Matrimid® to form mixed-matrix membranes for gas separations. Scanning electron microscopy (SEM) images of the membrane cross-sections revealed significant plastic deformation of the polymer matrix owing to the strong affinity between the MOF-5 and Matrimid®. At 30% MOF-5 loading, the permeabilities of the gases tested increased 120% while the ideal selectivities remained constant compared to Matrimid®. Residual gas analysis of permeates of gas blends with different mixture ratios revealed an increase in selectivity for CH4.