| Al2O3-ZrO2复合膜的制备与表征 |
| Preparation and Characterization of Al2O3-ZrO2 Composite Membranes |
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| 摘要: 以异丙醇铝和氧氯化锆为原料,用溶胶-凝胶法在Al2O3中空纤维上制备了Al2O3-ZrO2复合膜。应用TG、DTA、XRD、SEM等测试手段对复合膜的热稳定性、结构、形貌进行了表征。结果表明复合膜的热稳定性比单一由氧化铝或氧化锆制成的膜有显著的提高,在1100℃之前,复合膜以t-ZrO2存在,1200℃时,出现了m-ZrO2和α-Al2O3相。扫描电镜分析表明,膜表面完整、无缺陷。气体渗透实验进一步表明所得膜具有一定的气体选择性,0.3MPa和0.5MPa下对氮气和氩气的分离因子α分别为1.191和1.185,和氮气与氩气的理论分离因子(α=1.194)相当,说明气体通过膜的扩散以Knudsen扩散传质为主。用等温氮气吸附实验测定了非担载膜的孔径大小和分布,最可几孔径约为4.3nm。 |
| 关键词: Al2O3-ZrO2复合膜 溶胶-凝胶 制备与表征 |
| 基金项目: |
| Abstract: Al2O3-ZrO2 composite membranes supported on Al2O3 hollow fiber were prepared by sol-gel process from alu-minium iso-propoxide and zirconyl chloride as their raw materials. The thermal stability, phase transformation, structure and morphology of composite membranes were characterized by thermogravimetric analysis and differential thermal analysis (TGA-DTA), X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The results show that the thermal stability of composite membranes is better than pure Al2O3 or ZrO2 membrane. The crystal phase of composite membranes is tetragonal ZrO2 below 1100℃, but monoclinic ZrO2 and alpha Al2O3 ap-pear at 1200℃. Investigation with SEM showed that the membranes were defect-free. Gas permeation testing showed that the membranes were of gas selectivity ,and the separation factor of nitrogen to argon were 1.191 and 1.185 at 0.3MPa and 0.5MPa, respectively, which were similar to theoretical separation factor(α=1.194). This showed that gas diffusion through membranes was governed by Knudsen diffusion mechanism. The most probable pore diameter of an unsupported composite membrane was about 4.3nm as characterized by nitrogen isothermal absorption measurement. |
| Keywords: Al2O3-ZrO2 composite membrane sol-gel preparation and characterization |
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| 郝艳霞,李健生,杨绪杰,陆路德,汪信.Al2O3-ZrO2复合膜的制备与表征[J].无机化学学报,2002,18(3):245-248. |
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