Determination of thermodynamic parameters of hydrogen permeationof palladium membrane for considering the effect of stainless steelsupport

A palladium composite membrane was prepared by electroless plating onoxidized porous stainless steel support (ox-PS S). Hydrogen penneation fluxthrough this composite membrane was measured in the temperature rangeof 574-674 K and the pressure difference of two sides of membrane up to kPa90. A simplified resistance model was employed to analyze the pennea-tion behavior of hydrogen through Pd/ox-PSS membrane for calculating thecontribution of each layer in resistance against the hydrogen transport. Theamount of enthalpy of hydrogen dissolution of palladium membrane is -9.4kJ/mol.Considering a complete detailed model, this value was used for discussing theeffect of interaction of metal- support on hydrogen exiting from the palladiumlayer at the downstream side. Several composite membranes which differ insupport material has been compared with each other. It was confinned that themetal-support interaction, plays an effective role in exiting activation energy.In Pd/ox-PSS composite membrane, the metal-support interaction decreaseshydrogen exiting rate from Pd membrane’s downstream side.

Keywords:

Palladium composite membrane , Enthalpy of hydrogen dissolution , Porous stainless steel support