LAUSR

Abstract For alloy design of hydrogen permeable membrane, it is important to control pressure–composition–isotherm (PCT curve) in an appropriate manner in order to obtain high hydrogen permeability with strong resistance to hydrogen embrittlement. Based on this concept, V-based alloy membranes are designed under some given pressure conditions at a temperature in view of the partial molar enthalpy change, Δ H ¯ 0.2 , and entropy change, Δ S ¯ 0.2 , of hydrogen for hydrogen dissolution. It is demonstrated that the PCT curve can be controlled very precisely in view of Δ H ¯ 0.2 and Δ S ¯ 0.2 . Also, the required membrane area to obtain 300 Nm3 h−1 of hydrogen flow is estimated. It is found that, in view of the membrane area, it is favorable to apply at least 400 kPa of hydrogen pressure at feed side.