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• W2074036071 abstract "A series of Si-modified membranes were prepared by chemical vapor deposition using 40 Å γ-alumina tubular membranes as supports. Their hydrogen permeance ranged from 0.028 to 17.6 m3/m2 h atm and H2/N2 selectivity (permeance ratio) ranged from 12.6 to 72 at 600°C. The selectivity to isobutane ranged from 40 to 240 at 300°C and could be higher at a higher temperature. Compared with similar membranes documented in the literature. these membranes exhibited “order-of-magnitude” improvement in the permeance while maintaining a moderate selectivity. These membranes could be ideal for industrial gas separations and catalytic reactions handling a large volume of streams. Hindrance diffusion through micropores (i.e.,5&#x0303; Å) and Knudsen diffusion through larger pores were suggested separation mechanisms for these modified membranes. These mechanisms coupled with hypothetical pore size distributions were tested satisfactorily with a wide range of permeation behaviors delivered by a series of membranes with different microporous structures. Specifically, they explained the subtle permeation difference between hydrogen and helium, and the relative contribution between hindrance and Knudsen diffusion for nitrogen. Separations of gas mixtures containing hydrogen were confirmed similar to the ideal separations determined by single components. The modified membranes were thermally stable at 600 °C. The hydrothermal stability test indicated that the membrane structure approached a new steady state immediately after exposing to moisture." @default.
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• W2074036071 date "1994-12-01" @default.
• W2074036071 modified "2023-10-11" @default.
• W2074036071 title "Characterization of hydrogen-permselective microporous ceramic membranes" @default.
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• W2074036071 doi "https://doi.org/10.1016/0376-7388(94)00139-1" @default.
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