Morphology of Rhodium Particles in Ex-chloride Rh/Ce0.5Zr0.5O2 Catalyst

G. Vlaic, P. Fornasiero, G. Martra, E. Fonda, J. Kašpar, L. Marchese, E. Tomat, S. Coluccia, M. Graziani

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

The morphology of rhodium particles in a 5 wt% Rh/Ce0.5Zr0.5O2 catalyst subjected to different treatments is investigated by EXAFS, HREM, and H2 chemisorption. Despite the high Rh loading, highly dispersed metal particles are observed in the sample. In the presence of NO and CO, the Rh particles are easily oxidized to give small Rh oxide clusters, and the high rhodium dispersion is retained even after a further reduction at 773 K. Comparison with an Rh/Al2O3 prepared under identical conditions clearly suggests that the presence of the Ce0.5Zr0.5O2 support favors high dispersion of rhodium particles. Despite the fact that RhCl3·nH2O has been employed as precursor, no chloride could be detected in the Rh nearest-neighbor shell, suggesting its migration over the support.

Original languageEnglish (US)
Pages (from-to)182-190
Number of pages9
JournalJournal of Catalysis
Volume190
Issue number1
DOIs
StatePublished - Feb 15 2000
Externally publishedYes

Keywords

  • Ceria-zirconia mixed oxides
  • EXAFS analysis of
  • Rh catalysts
  • Rh/CeO-ZrO solid solutions
  • Rhodium catalysts
  • Rhodium chloride
  • Three-way catalysts

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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    Vlaic, G., Fornasiero, P., Martra, G., Fonda, E., Kašpar, J., Marchese, L., Tomat, E., Coluccia, S., & Graziani, M. (2000). Morphology of Rhodium Particles in Ex-chloride Rh/Ce0.5Zr0.5O2 Catalyst. Journal of Catalysis, 190(1), 182-190. https://doi.org/10.1006/jcat.1999.2731