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- W2364131357 abstract "Preparation and hydrothermal stability of microporous silica membrane were studied. A stable SiO2 polymeric sol was successfully synthesized with tetraethylorthosilicate as precursor through polymeric sol-gel route. α-Al2O3 supported defect-free mesoporous γ-Al2O3 disk membrane with average pore size of about 3 nm was fabricated via dip coating and subsequently calcined at 600℃. The effect of calcination temperature on the properties of SiO2 powder and gas permeabilities of supported SiO2 membranes, especially with regard to the hydrothermal stability of SiO2 microporous membranes, was studied in detail. The results show that He permeability of SiO2 membranes calcined at 400～800℃ was (7.29～12.7)×10-7 mol/(m2·s·Pa) at 200 ℃ and 0.3 MPa. The permselectivity of He with respect to CO2, O2, N2, CH4 and SF6 was 98, 49, 64, 79 and 91, respectively, indicating a molecular sieving effect. The calcination temperature played a key role in determination of the hydrothermal stability of microporous silica membrane, which was confirmed experimentally. The performance of SiO2 membrane calcined at 400, 600 and 800℃ deteriorated under the H2O pressures of 8, 200 and 200 kPa, respectively." @default.
- W2364131357 created "2016-06-24" @default.
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- W2364131357 date "2010-01-01" @default.
- W2364131357 modified "2023-09-28" @default.
- W2364131357 title "Hydrothermal Stability of Microporous SiO_2 Membranes" @default.
- W2364131357 hasPublicationYear "2010" @default.
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