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- W2137104397 abstract "Permeation and separation experiments with H2, CO2, O2, N2, CH4 and isobutane with microporous sol-gel modified supported ceramic membranes were performed to determine the gas transport characteristics and the hydrogen separation performance of these membranes. It is found that the permeation is activated, and for defectfree membranes the apparent activation energies are in the ranges 13?15 and 5?6 kJ mol?1 for H2 and CO2, respectively. Correction for the pressure drop over the support results in apparent activation energies for the silica top-layer on the order of 17?22 and 10?15 kJ mol?1 for H2 and CO2 respectively. Due to the very thin top-layer, the permeation is relatively high, with representative values of 6·10?7 and 20·10?7 mol m?2s?1 Pa?1 for H2 at 25 and 200°C, respectively. The H2 permeation is almost pressure-independent up to pressures of at least 5 bar. Typical separation factors for H2---CH4 and H2---isobutane are approximately ?40 and ?200, respectively, at 200°C for high-quality membranes. For moderate-quality membranes the H2---CH4 separation factor is around 10, while the H2---isobutane separation factor remains at a high value of around 100 at 200°C and 120 at 300°C." @default.
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- W2137104397 date "1995-06-01" @default.
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- W2137104397 title "Permeation and separation studies on microporous sol-gel modified ceramic membranes" @default.
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- W2137104397 doi "https://doi.org/10.1016/0927-6513(95)00004-s" @default.
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