Standard permeation techniques (based upon pressure and flow-meter measurements) were used to study the permeation of H and D through Pd-25wt%Ag under driving pressures of up to 1000psia; with back-pressures of up to 100psia. The results, for temperatures of 300, 400 and 500C, could be described by:

H:     P (g mol/min) = 3.85 x 10-6 A exp[-794/T(K)] [d½ - b½]/h

D:     P (g mol/min) = 1.68 x 10-6 A exp[-479/T(K)] [d½ - b½]/h

where A (cm2) was the effective area of the membrane, h (cm) was the thickness of the membrane, d (psia) was the driving pressure, and b (psia) was the back-pressure.

F.J.Ackerman, G.J.Koskinas: Journal of Chemical Engineering Data, 1972, 17[1], 51-5

Table 136

Migration Energies of H Isotopes

in Pd-Ag Alloys at 40 to 60K