采用溶胶-凝胶技术,在多孔Al2O3载体上制备了一层适合于涂覆分离膜的γ-Al2O3多孔过渡膜.通过XRD与DTA-TG等测试手段研究了γ-Al2O3凝胶膜在热处理过程中的物理化学变化;通过TEM、SEM分析与泡点法研究了多孔膜的微观结构.实验结果表明:实验中制备的γ-Al2O3膜具有择优取向的特点;γ-Al2O3过渡膜的最可几孔径为0.38μm左右,厚度为4μm.薄膜的渗透性能测试结果表明,材料对H2与N2气的最大分离系数α=3.30.
Porous γ-alumina transition membranes with a most probable pore size of 0.38μm and thickness of 4μm were successfully synthesized
via sol-gel route on the porous alumina substrates with pore size of 0.9μm. The physical chemistry transformation and microstructure of the
as-prepared membranes were systematically characterized by using DTA-TG, FTIR, XRD and SEM. The results indicate that the transition membranes fabricated
in the work are smooth without any crack. Also, As-prepared membrane has the characteristic of preferred oritation. The separation coefficient for
H2-N2 is about 3.30.
参考文献
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