Fast-current-driven synthesis of ultrathin ZIF-8 membrane on ceramic tube for propene/propane separation

作者：Zhao, Yali; Yang, Xiayi; Luo, Jiayu; Wei, Yanying^*; Wang, Haihui^*

来源：AICHE Journal, 2023, 69(4): e17934.

DOI：10.1002/aic.17934

• C3H6/C3H8 separation
• ceramic tube
• fast current-drive synthesis method
• membrane separation
• ZIF-8 membrane

MOF membranes are very promising in molecular separation, but it is still a challenge for industrial applications due to the complex and time-consuming synthesis. We use the fast current-driven synthesis (FCDS) method to achieve controlled growth of ZIF-8 membranes on porous graphite-coated ceramic tubes by controlling the growth time and current density. Grown for 30 min at a current density of 0.74 mA/cm(2), the ZIF-8 membrane exhibits selectivity for C3H6/C3H8 up to 63 with C3H6 permeance of 6 x 10(-9) mol/(m(2) s Pa). Furthermore, the ZIF-8 membrane exhibits a pressure resistance of up to 3 bar and good stability of similar to 96 h. This work realizes the breakthrough of the MOF membrane synthesis via FCDS method from the frequently-used expensive and fragile anodic aluminum oxide (AAO) disc substrate to the tough ceramic tubular substrate, which broadens the road for the industrialization of MOF membranes in gas separation fields.

• 单位
  清华大学