Development of Hydrogen Separation Membranes with Controlled Silica Network sizes by structured Alkoxides

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Bis (triethoxysilyl) ethane (BTESE), which consists of Si-C-C-Si bonds, was used as a silica precursor to prepare organic-inorganic hybrid silica membranes with loose amorphous networks. Pore size distribution, as determined by single gas permeation, suggested BTESE-derived silica membranes had loose amorphous silica structures compared to TEOS-derived silica membranes due to the differences in the minimum units of silica networks; for example, BTESE-derived silica membranes showed high hydrogen permeance (0.5-2.0×10^<-5>mol・m^<-2>・s^<-1>・Pa^<-1>) with high selectivity of H_2 to SF_6 (H_2/SF_6 permselectivity: 1,000-30,000) and low H_2 to N_2 permselectivity (10-20).