【摘要】 用纳米晶种涂层二次生长成膜法在大孔α-Al2O3(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H2/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/(m2-s-Pa).气体分离数据表明,该膜没有明显的缺陷存在.更多还原

【Abstract】 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 1.43×106 mol/(m2sPa). The data of gas permeation indicated that the membrane was defect-free.更多还原