Fig. 2-10

Phenomenon of counter permeation of H2 and D2 Deuterium and hydrogen molecules will often dissociate and adsorb as atoms onto a metal surface. Some D and H atoms will recombine and desorb, while other atoms will diffuse into the metal. This diffusion will be in proportion to the concentration gradients of each type of atom.

Fig. 2-11

Blocking effect by dissolved H atoms on metal surface The rate of adsorption and desorption of H2 is higher than the rate of atomic diffusion of D. Thus, D atoms do not reach the metal surface due to the more active H2 adsorption and desorption on the surface.

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