纳米晶种涂层法合成Silicalite-1沸石膜

Synthesis of Silicalite-1 Zeolite Membrane by Nanocrystal Seed Coating Method

用纳米晶种涂层二次生长成膜法在大孔旺．A1203（孔径4～6μm）陶瓷管上合成Silicalite-1沸石膜．用X射线衍射（XRD）和扫描电镜（SEM）表征分析了沸石膜的形态，并通过单组分气体渗透实验对合成膜管的渗透性能进行了测试．结果表明，合成的Silicalite-1沸石膜连续、互生，看不出晶间孔；沸石膜层厚8-10μm；常温常压下HE／N2的理想分离系数为3．9，超过其努森扩散值3．74，H2／C3H8的理想分离系数为19．1，远大于其Knudsen扩散比值4,69，且H2的渗透率达到1．43×10^-6mol／（m^2·s·Pa）．气体分离数据表明，该膜没有明显的缺陷存在．

The Silicalite-1 zeolite membrane was prepared by secondary synthesis on the porous （α-Al2O3 support. The samples were characterized by XRD and SEM, and the permeant selectivity of the membrane was characterized by single-gas at room temperature. The results showed that the membrane re-grew, its thickness was about 8-10 μm and the ideal separation factors were 3.9 for H2/N2 and 19.1 for H2/C3H8 at room temperature, respectively, which are larger than the Knudsen diffusion ratios 3.74 for H2/N2 and 4.69 for H2/C3H8, the permeation rate of H2 was 1.43× 10^-6 mol/（m^2·s·Pa）. The data of gas permeation indicated that the membrane was defect-flee.