Exchange reaction of hydrogen isotopes on proton conductor ceramic of hydrogen pump for blanket tritium recovery system

Kawamura, Yoshinori; Isobe, Kanetsugu; Yamanishi, Toshihiko

Electrochemical hydrogen pump using ceramic proton conductor has been investigated to discuss about application of it for the blanket tritium recovery system of the nuclear fusion reactor. As the series of that work, the transportation experiments of H-D mixture via ceramic proton conductor membrane have carried out. Then, the phenomenon that was caused by the exchange reaction between the deuterium in the ceramic and the protium in the gas phase have observed. So, the ceramic proton conductor which was doped deuterium was exposed to protium under the control of zero current, and the gas sampled at downstream was analyzed. It is considered that the protium in the gas phase is taken into the ceramic by isotope exchange reaction, and penetrates to the ceramic by diffusion with substitution of deuterium. And then, the reaction rate constant of isotope exchange reaction and the diffusion coefficient were also estimated.