功能化无机粒子修饰大孔载体反扩散法制备ZIF-7膜

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

采用功能化无机粒子“二合一”修饰的方法，通过将3-氨丙基三乙氧基硅烷（APTEs）功能化的α-Al2O3粒子负载在大孔的管状载体上制备了类沸石咪唑框架（ZIF-7）膜，考察了APTES的用量对ZIF．7膜制各的影响。结果表明，嫁接有APTES的α-Al2O3粒子负载在载体上，有效降低了载体表面孔尺寸并增加了载体表面异相成核的位点，促进了膜的生长，在APTES与α-Al2O3粒子的摩尔比为1：3时，能够制得致密连续较薄的ZIF-7膜，膜厚度大约为2～3um，H2的渗透通量为4．70×10-7mol／（m2·s·Pa），H2／C02、H2／N2的理想分离因数分别为5．87、4．59，均大于努森扩散系数。

A ＂two-in-one＂ approach, namely, through deposition of APTES-functionalized A1203 particles onto a coarse macroporous support, was applied to synthesize zeolitic imidazolate tramework-7 （ZIF-7） membranes. The effect of molar ratio of APTES and A1203 particles on the formation of ZIF-7 membranes were investigated in detail. When nAPTES： hA12% =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/（m2.s.Pa）. Its ideal molecular sieving selectivity of H2/CO2 and H2/N2 was at 5.87 and 4.59, respectively.