Tritium oxidation performance of hydrophobic Pt-catalyst developed for room temperature recombiner

Iwai, Yasunori; Sato, Katsumi; Yamanishi, Toshihiko; Taniuchi, Junichi*; Noguchi, Hiroshi*; Kubo, Hitoshi*; Harada, Nobuo*; Oshima, Yusuke*

The inorganic-based hydrophobic Pt-catalyst named H1P has been developed especially for efficient oxidation of a tracer level of tritium at room temperature even in the presence of saturated water vapor. Overall reaction rate constant of tritium oxidation on a H1P catalyst in a flow-through system were determined as a function of space velocity, hydrogen concentration in carrier, temperature of catalyst, water vapor concentration in carrier. The overall reaction rate constant for H1P catalyst at room temperature was considerably larger than that for traditionally applied Pt-alumina catalyst. The overall reaction rate constant at room temperature was dependent on the space velocity and hydrogen concentration in carrier. The overall reaction rate constant under the dry and wet conditions was proportional to hydrogen concentration in carrier to the power 0.33 and 0.44, respectively.