Rhodium dispersion in a Rh/Ce0.68Zr0.32O2 catalyst investigated by HRTEM and H-2 chemisorption

J M Gatica, R T Baker, P Fornasiero, S Bernal, G Blanco, J Kaspar

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66 Citations (Scopus)

Abstract

The effect of reduction temperature on the hydrogen adsorption and Rh dispersion in a Rh/Ce0.68Zr0.32O2 catalyst with texturally stable Ce0.68Zr0.32O2 support was investigated. Rh dispersion data were also obtained from Rh particle size analyses made using high-resolution transmission electron microscopy (HRTEM) images. Comparison of the dispersion values obtained by using the two techniques showed that Hz adsorption at -80 degrees C is a suitable tool for the estimation of Rh dispersion at reduction temperature, T-red, less than or equal to 500 degrees C. For T-red > 500 degrees C, a partial suppression of H-2 chemisorption was observed. However, after a mild reoxidation and low temperature reduction, the H-2 adsorption capacity of these samples was regenerated and good agreement with the HRTEM data was again obtained.

Original languageEnglish
Pages (from-to)4667-4672
Number of pages6
JournalJournal of Physical Chemistry B
Volume104
Issue number19
Publication statusPublished - 18 May 2000

Keywords

  • CE0.5ZR0.5O2 MIXED-OXIDE
  • RH/CEO2 CATALYSTS
  • OXIDIZING CONDITIONS
  • REDOX BEHAVIOR
  • 3-WAY CATALYSTS
  • CERIA
  • SURFACE
  • RH
  • REDUCTION
  • SYSTEMS

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