Pt/C catalysts were prepared by conventional and improved impregnation-reduction method

or microwave heating method. Transmission electron microscopy analyses indicated that average sizes of Pt particles by the three methods were (2.9±0.8) nm

(2.0±0.7) nm and (1.9±0.5) nm

respectively. X-ray photoelectron spectroscopy measurements revealed that the Pt(0) contents of the Pt/C catalysts by microwave heating method and improved impregnation-reduction method are 40.9% and 43.3%

respectively. The Pt/C catalysts obtained by microwave heating method were reduced by H2/N2 mixed gas in 300℃ for 2 h

or 500℃ for 1 h. The average sizes of Pt particles increase to 2.2 and 2.1 nm

and the Pt(0) contents increase to 44.3% and 49.7%

respectively. The polytetrafluoroethylene and Pt/C catalysts were supported on foamed nickel (FN) to obtain hydrophobic Pt/C/FN catalysts

and the catalytic activities of the hydrophobic catalysts were investigated for hydrogen-water liquid phase exchange reaction. The average size of Pt particles and the Pt(0) content have influences on the catalytic activity of the Pt/C/FN catalyst. The increased dispersion of Pt particles or Pt(0) contents increases catalytic activities of the hydrophobic catalysts.