Several kinds of hydrophobic catalysts were developed to recover tritium from the DTO in CANDU reactors. A recycle reactor was built for the purpose of characterizing the developed hydrophobic catalysts. Two parameters, catalytic rate constant and pressure drop, of the hydrophobic catalysts called KC-1, KC-3, and KC-3S were measured at 100% relative humidity. The catalytic rate constants were measured at 60 ℃, and all the catalysts showed very high initial catalytic rate constants. The measured deactivation profile showed that catalytic rate constants of KC-1 and KC-3 were almost identical for 28 days. The deactivation profiles of the catalyst were represented in terins of catalytic rate constant, decontamination factor, and efficiency. The result showed that both KC-3 and KC-3S catalysts had a good exchange capacity for hydrogen isotopes and they could be used at the tritium removal facility that would be built at Wolsong nuclear power plants in the near future. The pressure drop across the catalyst bed was measured at three temperatures and various velocities. The result showed that the pressure drop caused by the catalyst bed was very small over the range of expected operation conditions.