Abstract
A high-permeance ZIF-8 membrane was successfully synthesized on the inner side of a porous hollow fiber ceramic tube in a simple flow system via in situ direct growth method. The continuously pumping fresh nutrients through the inner-surface favor increasing the heterogeneous nucleation of ZIF-8 crystals and the formation of continuous ZIF-8 membrane, thus leading to a high performance ZIF-8 membrane. The achieved ZIF-8 membrane was thin and dense, and has only a thickness of about 2.5 μm. The membrane demonstrated remarkably high H2 permeance of 1.9 × 10−6 mol m−2 s−1 Pa and excellent molecular sieving performance with H2/N2, and H2/CH4 ideal selectivities of 12.9 and 15.6, respectively.
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