Preparation and characterization of small silica-supported iridium particles from iridium trisacetylacetonate precursor

F. Locatelli, B. Didillon, D. Uzio, G. Niccolai, J. P. Candy*, Jean-Marie Maurice Basset

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

Iridium particles could be active and selective catalysts for the hydrogenolysis of internal C-C bonds of cyclic molecules, but the preparation and characterization of well-defined iridium metallic particles have not been fully investigated. Iridium particles supported on silica were prepared, beginning with iridium trisacetylacetonate (Ir(AcAc)3). At room temperature, Ir(AcAc)3 was physisorbed onto the surface. The decomposition of the precursor under a flow of hydrogen at 300°C produced metallic particles with narrow distributions of sizes 1-5 nm. The dispersions of the metallic particles inferred from electron microscopy observation was always lower than the dispersions computed from the chemisorption of O2, H2, and CO, assuming the stoichiometry: CO/Irs and O/Irs = 1, H/Irs = 2. The dispersion estimated from the size of the particle could be underestimated.

Original languageEnglish (US)
Pages (from-to)154-160
Number of pages7
JournalJournal of Catalysis
Volume193
Issue number1
DOIs
StatePublished - Jul 1 2000

Keywords

  • H, O, and CO adsorption on Ir
  • Heterogeneous catalyst
  • Ir/SiO
  • Small iridium metallic particles

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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