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Reaction Kinetics and Catalysis Letters

, Volume 90, Issue 1, pp 187–195 | Cite as

Characterization of Au-Rh/TiO2 catalysts by CO adsorption; XPS, FTIR and TPD experiments

  • János Raskó
  • Ákos Koós
  • Kornélia Baán
  • János Kiss
Article

Abstract

On X-ray photoelectron spectra of the Au-Rh/TiO2 catalysts the position of Au4f peak was practically unaffected by the presence of rhodium, the peak position of Rh3d, however, shifted to lower binding energy with the increase of gold content of the catalysts. Rh enrichment in the outer layers of the bimetallic crystallites was experienced. The bands due to Au0-CO, Rh0-CO and (Rh0)2-CO were observed on the IR spectra of bimetallic samples, no signs for Rh+-(CO)2 were detected on these catalysts. The results were interpreted by electron donation from titania through gold to rhodium and by the higher particle size of bimetallic crystallites.

Keywords

TiO2-supported Au-Rh bimetallic catalysts XPS FTIR 

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Copyright information

© Akadémiai Kiadó 2007

Authors and Affiliations

  • János Raskó
    • 1
  • Ákos Koós
    • 1
  • Kornélia Baán
    • 2
  • János Kiss
    • 2
  1. 1.Reaction Kinetics Research Group of the Hungarian Academy of Sciences at the University of SzegedHungary
  2. 2.Institute of Solid State and Radiochemistrythe University of SzegedSzegedHungary

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