EPR simulation to confirm the formation of Ag6O5 complex on the surface of 10% Ag/CeO2 catalyst after the propylene oxidation reaction

Sara Hany, Mira Skaf, Samer Aouad, Cédric Gennequin, Madona Labaki, Edmond Abi-Aad, Antoine Aboukaïs

Research output: Contribution to journalArticlepeer-review

Abstract

Ag2+ (b) species were detected by electron paramagnetic resonance (EPR) on silver loaded over ceria by impregnation in a previous work. Contrasting the EPR simulation with the experimental measurements evidenced that, upon propene oxidation, the Ag2+ (b) species transform into two clusters each containing 2 Ag2+ and 1 Ag+ species. This cluster is composed of two parallel electron spins (dimer) and three nuclear spins (trimer). Such a result led us to suggest that initially, Ag2+ (b) species clusters were formed by three parallel electron spins. The ferromagnetic character of Ag2+ (b) species may explain their catalytic performance towards total oxidation of propylene.

Original languageEnglish (US)
Pages (from-to)94-96
Number of pages3
JournalChemical Physics Letters
Volume703
DOIs
StatePublished - Jul 2018

Keywords

  • Ag
  • Dimer
  • EPR
  • Propylene
  • Simulation
  • Trimer

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry

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