A comparative study of hydrogen permeabilities and solubilities in some palladium solid solution alloys

Abstract Reproducible permeability data have been obtained for the approximately isoelectronic alloys Pd-25 at.% Ag, Pd-5.75 at.% Ce and Pd-8 at.% Y; the previously observed enhanced performance of the Pd-Y alloy has been confirmed. Hydrogen solubility measurements have also been made for the three alloys over the same range of pressures and temperatures as those employed in the permeability studies. Using these data the detailed shapes of the permeability versus temperature plots have been successfully analysed and it has been shown that the hydrogen diffusion coefficients in all three alloys are very similar. The present results show clearly that the enhanced performance of the Pd-Y diffusion membrane is due to the substantially greater hydrogen solubility gradient in this alloy membrane compared with that in Pd-25% Ag.

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