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The composite porous glass membrane was prepared by coating on porous alumina tubing by sol-gel method. The porous glass layer of the membrane contains 30mol% of ZrO2. The permeation rate of hydrogen of this membrane is ca. 50 times higher than that of a symmetric porous glass membrane with a reasonable separation factor for H2/N2 mixture and this membrane shows no degradation by heating at 500°C. This membrane is also proved to be stable by water vapor exposuring test at 350°C in an autoclave.
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Yazawa et al. (1991) studied this question.
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