Influence of Carrier on Catalytic Activity of Platinum Based Hydrophobic Catalysts

In order to study the influence of carriers on platinum(Pt) based hydrophobic catalysts’ activity, and explore the practicability of applying silicon carbide and ceriumzirconium composite oxides as carriers of hydrophobic catalysts, Pt based catalysts were prepared by microwave heating method, with carbon black, nanometer SiC and Ce 0.4 Zr 0.6 O2-γ-Al2O3 as carriers, respectively. Then Pt based catalysts were loaded on foam nickel (FN) with polytetrafluoroethylene latex, and hydrophobic catalysts were obtained. Structure of catalysts was analyzed by XRD, TEM, XPS, SEM, etc, moreover, their catalytic activity for recombination of H2-O2 and hydrogen-water liquid catalytic exchange was tested. Results show that Pt particles are evenly distributed on carriers’ surface, and average size of Pt particles in Pt/C, Pt/SiC and Pt/Ce 0.4 Zr 0.6 O2-γ-Al2O3are 4.46, 1.67 and 1.77nm, respectively. Three valences, Pt (0), Pt (Ⅱ) and Pt (Ⅳ) exist in Pt/C and Pt/SiC catalysts. Pt/C and Pt/SiC catalyst particles are evenly distributed on the surface of foam nickel, but it is not the case for Pt/Ce 0.4 Zr 0.6 O2-γ-Al2O3. The catalytic activity of Pt/C/FN is quite high for both recombination of H2-O2 and hydrogenwater liquid catalytic exchange. The catalytic activities of Pt/SiC/FN and Pt/Ce 0.4 Zr 0.6 O2-γ-Al2O3/FN are high for recombination of H2-O2, however, they are quite low for hydrogen-water liquid catalytic exchange.