Deposition of Functional Modified Inorganic Particles on A Macroporous Tube for Synthesis ZIF-7 Membrane by Counter Diffusion Method

A ''two-in-one'' approach, namely, through deposition of APTES-functionalized Al2O3 particles onto a coarse macroporous support, was applied to synthesize zeolitic imidazolate tramework-7 (ZIF-7) membranes. The ef- fect of molar ratio of APTES and Al2O3 particles on the formation of ZIF-7 membranes were investigated in detail. When nAPTES: 23 Al O n =1:3, the obtained continuous and thin ZIF-7 membrane with thickness ranging from 2 to 3 μm exhibited H2 permeance at 4.70×10 -7 mol/(m 2 ·s·Pa). Its ideal molecular sieving selectivity of H2/CO2 and H2/N2 was at 5.87 and 4.59, respectively.