Citation: LIU Xiang-Ge, WEI Qi, DING Yuan-Li, NIE Zuo-Ren, LI Qun-Yan. Pore Structure, Hydrogen Separation and Hydrothermal Stability of Hydrophobic Organic-Inorganic Hybrid Silica Membranes Modified by Perfluorooctyl Groups[J]. Chinese Journal of Inorganic Chemistry, ;2014, 30(5): 1111-1118. doi: 10.11862/CJIC.2014.147 shu

Pore Structure, Hydrogen Separation and Hydrothermal Stability of Hydrophobic Organic-Inorganic Hybrid Silica Membranes Modified by Perfluorooctyl Groups

1.
College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China

Received Date: 26 October 2013
Available Online: 10 December 2013
Fund Project: 国家自然科学基金(No.21171014，50502002)；国家863计划课题(No.2009AA03Z213)；北京市教育委员会科技计划重点项目(No.KZ201410005006)资助项目。 (No.21171014，50502002)；国家863计划课题(No.2009AA03Z213)；北京市教育委员会科技计划重点项目(No.KZ201410005006)

Organic-inorganic hybrid silica membranes were prepared by sol-gel technique using₁,2-bis(triethoxysilyl)ethane (BTESE) and 1H,1H,2H,2H-perfluorooctyltriethoxysilane (PFOTES) as precursors under acidic condition. The hydrophobic property, sol particle size distribution and pore structure of the modified silica membranes were characterized by contact angle measurement, FT-IR, dynamic light scattering and N₂ adsorption, respectively. The hydrogen permeation, separation and hydrothermal stability of the supported membranes were also investigated in detail. The results show that hydrophobic microporous membranes are obtained after modification by perfluorooctyl groups, with a water contact angle of (110.4±0.4)° and a pore size ranging from 0.5 to 0.8 nm at a PFOTES/BTESE molar ratio of 0.6. At 300 ℃, the transport of hydrogen in the modified supported hybrid silica membranes complies with a micropore diffusion mechanism, with a high hydrogen permeance of 8.5×10^-7 mol·m^-2·s^-1·Pa^-1, a H₂/CO₂, H₂/CO and H₂/SF₆ permselectivity of 5.49, 5.90 and 18.36, respectively, higher than those of the corresponding Knudsen value. Under a humid condition with a temperature of 250 ℃ and a water vapor molar ratio of 5%, the hydrogen permeance and H₂/CO₂ permselectivity of the modified silica membranes remain almost constant, indicative of an excellent hydrothermal stability for the membranes.
- perfluorooctyl groups;organic-inorganic hybrid silica membranes;pore structure;hydrogen separation; hydrothermal stability
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