Photochemical preparation of poly(N-vinyl-2-pyrrolidone)-stabilized platinum colloids and their deposition on titanium dioxide

Hisahiro Einaga, Masafumi Harada

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Abstract

Preparation processes for Pt-deposited TiO2 (Pt/TiO2) by the synthesis of Pt nanoparticles and their deposition were pursued by transmission electron microscopy, extended X-ray absorption fine structure, UV-vis spectroscopy, and Fourier transform infrared spectroscopic studies. Colloidal dispersions of Pt particles stabilized by poly(N-vinyl-2-pyrrolidone) (PVP) were photochemically synthesized in aqueous ethanol solution. The average diameter of Pt particles was estimated to be 2.0±0.5 nm, which was almost unchanged by changing the reducing agent from ethanol to methanol and 2-propanol. The PVP-stabilized Pt particles were distributed over a TiO 2 surface only by mixing the Pt colloidal dispersions and TiO 2. CO was chemically coordinated on the Pt particles on a TiO 2 surface after heat treatment was carried out in an O2 flow at 673 K to completely remove the residual PVP on Pt/TiO2. Hydrogen reduction at 473 K did not increase the amount of CO adsorbed on Pt sites. The Pt/TiO2 catalyst after the oxidation treatment showed higher activity for CO photooxidation than that obtained for pure TiO 2 catalyst. The CO photooxidation rate was not unchanged by the H2 reduction.

Original languageEnglish
Pages (from-to)2578-2584
Number of pages7
JournalLangmuir
Volume21
Issue number6
DOIs
Publication statusPublished - Mar 15 2005
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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