It was found that (a) Pd membranes activated by oxidization at 953K had greater permeabilities than those oxidized in situ at ≈523K (b) that the non-ideality of H dissolved in Pd accounted for deviations of the permeabilities - at higher pressures - from a direct dependence upon pH21/2 (c) that the diffusion constants of H in Pd at infinite dilution, obtained here, agreed well with literature data, (d) that Pd membranes prepared by oxidization at 953K were more resistant to CO poisoning than were those oxidized in situ at 523K, (e) that the permeability of a Pd membrane (oxidation at 953K) decreased over a 1h period in the presence - but not in the absence - of CO, and (f) that the CO-poisoning increased as the temperature decreased. The data were described by:

D(cm2/s) = 5.6 x 10-3exp[-23160/RT]

Permeation of Hydrogen through Pre-Oxidized Pd Membranes in the Presence and Absence of CO. D.Wang, T.B.Flanagan, K.L.Shanahan: Journal of Alloys and Compounds, 2004, 372[1-2], 158-64