Titanium‐Oxo Cluster Assisted Fabrication of a Defect‐Rich Ti‐MOF Membrane Showing Versatile Gas‐Separation Performance

Abstract

Abstract Although having shown great promise for efficient gas separation, relevant study of Ti‐MOF membranes remains very scarce, owing to limited Ti source types and uncertain factors which dominate the separation properties. In this work, we pioneered the use of the Ti 8 (μ 2 ‐O) 8 (OOCC 6 H 5 ) 16 cluster as the Ti source of MIL‐125 membranes, which led to lower reaction temperature and higher missing‐linker number within the framework and therefore, enhanced CO 2 /N 2 adsorption selectivity. The MIL‐125 membrane prepared by combining single‐mode microwave heating with tertiary growth displayed an ideal CO 2 /N 2 selectivity of 38.7, which ranked the highest among all pristine pure MOF membranes measured under comparable conditions. In addition, the ideal H 2 /N 2 and H 2 /CH 4 selectivity was as high as 64.9 and 40.7, thus showing great promise for versatile utility in gas separation.