オルガノシリカ膜の開発と膜型反応器　への応用

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1. For organosilica membranes, one of the potential applications of separation is H2 purification at high temperatures from C3H6. But the thermal stability of organosilica membranes has remained unclear, because membranes are usually prepared and used at temperatures lower than 300 °C due to decomposition of the organic linking units at high temperatures. The development of organosilica materials-derived membranes with thermal/oxidation stability at high temperatures and high gas selectivity remains a challenge. To this end, we developed organosilica membranes prepared at high temperatures under N2 and membranes showed excellent selectivity with high levels of H2 permeance and a permeation performance that could be tailored by treatment under air at 550 °C.2. Microporous inorganic membranes prepared via a sol-gel method were proposed for O2/SO3 separation. Single-gas permeation measurements revealed that silica-zirconia membranes with a large pore size and a high Si/Zr molar ratio had good resistance to SO3, which was confirmed by the change of gas permeance. Characterizations including BET, EDS, and pH indicated the SiO2, α-Al2O3 and lower Zr-content SiZr powders had good chemical stability against SO3 even at 550 °C. In the binary-component gas separation of SO3/O2, the membrane that consisted of BTESE separation layer, SiZr (Si/Zr = 7/3) intermediate layer and α-Al2O3 support layer showed an O2 permeance of 2.5*10－8 mol m-2 s-1 Pa-1 and exhibited an O2/SO3 selectivity of 10.