Characterization by XPS and XAS of supported Pt/TiO2CeO2 catalysts

✍ Scribed by A Dauscher; L. Hilaire; F. Le Normand; W. Müller; G. Maire; A. Vasquez

• Publisher: John Wiley and Sons
• Year: 1990
• Tongue: English
• Weight: 520 KB
• Volume: 16
• Category: Article
• ISSN: 0142-2421
• DOI: 10.1002/sia.740160173

✦ Synopsis

Abstract

TiO~2~ and CeO~2~ are will known for inducing strong metal‐support interactions J(SMSI) of a different nature when used as supports for Pt catalysts. X‐ray photoelectron spectroscopy analysis of mixtures of TiO~2~CeO~2~ oxide supports (80:20 and 20:80) reveals at the surface a remarkable stabilization of cerium in the +3 oxidation state; the stabilization is more pronounced with lower cerium oxide concentration. X‐ray absorption spectroscopy measurements done on the L~III~ edge show the same variation as a function of cerium oxide concentration, but in the bulk the reduction is much lower. Cerium in Pt/TiO~2~CeO~2~ catalysts exhibits the same behaviour.