Abstract: Pt/C （w(Pt=10%） catalyst was prepared by microwave heating method at high pressure, and the average size of Pt particles was (2.1±0.7) nm. Then polytetrafluoroethylene (PTFE) and the Pt/C catalyst were supported on foamed nickel (FN) to obtain hydrophobic Pt/C/FN catalyst. The effects of reaction temperature and H₂ flow rate on the catalytic activity of the Pt/C/FN catalyst were determined for the recombination reaction of H₂O₂ at ambient temperature. The catalytic activity of the hydrophobic Pt/C/FN catalyst is found to be remarkablely higher than that of the commercial hydrophilic Pt/Al₂O₃ catalyst. Its catalytic activity decreases little under moist environment, compared with dried condition. The influence of CO on its catalytic activity was examined under excess O₂. The H₂ conversion is influenced by CO slightly.