The diffusion of H was studied at 200 to 300C. The results could be described

by:

D (cm2/s) = 1.06 x 10-2 exp[-9.18(kcal/mol)/RT]

W.G.Perkins, D.R.Begeal: Berichte der Bunsengesellschaft für Physikalische Chemie, 1972, 76[8], 863