Influence of Carrier on Catalytic Activity of Platinum Based Hydrophobic Catalysts

doi:10.3724/SP.J.1077.2010.00279

Abstract

Abstract: In order to study the influence of carriers on platinum(Pt) based hydrophobic catalysts’ activity, and explore the practicability of applying silicon carbide and ceriumzirconium 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 hydrogenwater 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.

Key words: platinum based catalyst, hydrophobic catalyst, carbon black, nanometer silicon carbide, cerium-zirconium composite oxide-γ-alumina

CLC Number:

O614

XIONG Liang-Ping,HU Sheng,REN Xing-Bi,LUO Yang-Ming. Influence of Carrier on Catalytic Activity of Platinum Based Hydrophobic Catalysts[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2010.00279.

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