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• W2019011669 abstract "Composite membranes comprised of vanadium foils coated with molybdenum carbide catalyst layers were recently introduced as alternatives to palladium for high temperature separation of H 2 . Experiments using D 2 /H 2 mixtures unambiguously show that the mechanism involves dissociation, proton transport, and subsequent recombination. Temperature-dependent measurements of H 2 flux were performed on sets of membranes in which the thickness of both the V foil and the Mo 2 C layers were varied in order to provide insight into the underlying transport mechanisms. It is shown that hydrogen transport through the carbide itself can be limiting for catalyst layers >20 nm. At temperatures <750 °C the flux is highly activated, suggesting that dissociation of H 2 on the carbide surface is the rate limiting step. At higher temperature the permeability decreases with temperature in good agreement with the theoretical predictions of the permeability of the underlying V metal. The permeability of these composite membranes significantly exceeds that of pure Pd, with values as high as 5.9×10 −8 mol m/m 2 s Pa 0.5 at 750 °C. ► Optimized permeability of V/ Mo 2 C composite membranes 70% higher than pure Pd. ► For T ≥750 °C, the hydrogen permeability is controlled by the V foil. ► At lower temperature H 2 flux controlled by carbide catalyst layers. ► First hydrogen permeability measurements of V at high temperatures." @default.
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• W2019011669 date "2013-01-01" @default.
• W2019011669 modified "2023-09-24" @default.
• W2019011669 title "Mechanistic studies of hydrogen transport through /V composite membranes" @default.
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• W2019011669 doi "https://doi.org/10.1016/j.memsci.2012.09.042" @default.
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