催化学报

催化学报 ›› 2006, Vol. 27 ›› Issue (3): 250-254.

• 研究论文 • 上一篇    下一篇

Pd修饰的选择分离氢的负载型PI-SiO2杂化膜的制备及应用

顾永建,钟顺和   

  1. 天津大学化工学院, 天津 300072
  • 收稿日期:2006-03-25 出版日期:2006-03-25 发布日期:1984-10-26

Preparation and Application of Supported Palladium-Modified Polyimide-Silica Hybrid Membrane for Selective Separation of H2

GU Yongjian, ZHONG Shunhe*   

  1. College of Chemical Engineering and Technology, Tianjin University, Tianjin 300072 , China
  • Received:2006-03-25 Online:2006-03-25 Published:1984-10-26

PDF

659

被引次数

13

摘要： 以负载TiO2过渡层的硅藻土-莫来石陶瓷膜管为支撑体,采用溶胶-凝胶法制备了金属钯修饰的负载型聚酰亚胺-二氧化硅杂化膜(Pd-PI-SiO2). 利用红外光谱、扫描电子显微镜和低温N2吸附等手段对膜材料结构、微观形貌及孔径分布等进行了表征,并对CH4, H2O, H2, CO2, CO和N2等气体进行了选择渗透性测试. 结果表明,杂化膜中聚酰亚胺与二氧化硅间形成了键联结构; 钯以还原后的金属态存在且分散均匀,能对聚酰亚胺-二氧化硅膜的孔结构起到修饰作用; 杂化膜孔径为 4 nm 左右; N2在此膜中的渗透通量为0.20×10-7 mol/(m2·Pa·s), H2/N2分离因子达542; 钯能够促使H2在膜渗透过程中按表面扩散机制进行,有助于分离混合气中的氢分子.

关键词: 溶胶-凝胶法, 负载型杂化膜, 钯修饰, 聚酰亚胺, 二氧化硅, 氢分离

Abstract: The palladium-modified polyimide-silica (Pd-PI-SiO2) hybrid membrane supported on the kieselguhr-mullite ceramic membrane substrate with a TiO2 transition layer was prepared by the sol-gel method. Infrared spectroscopy, scanning electron microscopy, low temperature N2 adsorption, and gas permeability measurement techniques were used to characterize its structure, micro-surface, pore distribution, and permeability for CH4, H2O, H2, CO2, CO, and N2. The results indicate that a bond is formed between PI and SiO2, and palladium exists in the hybrid membrane as a metallic state with good distribution, which can modify the micro-pore structure of the PI-SiO2 membrane. The pore diameter of the Pd-PI-SiO2 membrane is about 4 nm. The gas permeability measurements show that the N2 permeance flux of this hybrid membrane is 0.2×10-7 mol/(m2•Pa•s), and the separation coefficient of H2/N2 is 542. Palladium has an adsorption effect for hydrogen, which can promote the separation of hydrogen from the gaseous mixture.

Key words: sol-gel method, supported hybrid membrane, palladium modification, polyimide, silica, hydrogen separation