Abstract
Abstract Continuous and c- oriented ZIF-69 membranes were successfully synthesized on porous α-alumina substrates by an in situ solvothermal method. The membranes were characterized by XRD, SEM and single-gas permeation tests. The BET measurements on crystals taken from the same mother liquor that was used for membrane synthesis yield a Langmuir surface area of 1138 m 2 /g. The stability of the membrane towards heat and different solvents were studied. Single-gas permeation experiments through ZIF-69 membranes were carried out by a vacuum method at room temperature using H 2 , CH 4 , CO, CO 2 and SF 6 , respectively. The permeances were in the order of H 2 > CO 2 > CH 4 > CO > SF 6 . The separation of CO 2 /CO gas mixture was investigated by gas chromatograph (GC) and the permselectivity of CO 2 /CO was 3.5 ± 0.1 with CO 2 permeance of 3.6 ± 0.3 × 10 −8 mol m −2 s −1 Pa −1 at room temperature.
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