The effect of support resistance on the pressure exponent was studied. A Pd–Cu–Ni ternary alloy film was formed on a newly-developed porous Ni support which exhibited Knudsen diffusion. The H permeation flux was measured at 673, 723 and 773K for 2 permeation directions: support-to-film (SF-mode) and film-to-support (FS-mode). It was found that the permeation direction had an effect upon the H permeation flux and the pressure exponent. For both permeation directions, the interface pressure of the Pd alloy film and the porous Ni support was determined and was found to be affected by the permeation direction. The interface pressure obtained was used to clarify why the pressure exponent deviated from Sieverts’ law. It was found that the reason was support resistance rather than surface reaction.

The Effect of Support Resistance on the Hydrogen Permeation Behavior in Pd–Cu–Ni Ternary Alloy Membrane Deposited on a Porous Nickel Support. S.K.Ryi, J.S.Park, S.H.Kim, S.H.Cho, D.W.Kim: Journal of Membrane Science, 2006, 280[1-2], 883-8