Thermal decomposition of Fe3(CO)12 adsorbed on silica: A study by gas-phase analysis, infrared spectroscopy, magnetization measurements, ferromagnetic resonance and Mössbauer spectroscopy

D. Rojas*, P. Bussière, J. A. Dalmon, A. Choplin, J. M. Basset, D. Olivier

*Corresponding author for this work

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Abstract

The thermal decomposition under H2 of Fe3(CO)12 adsorbed on silica 500 has been followed by the above-mentioned techniques. Fe3(CO)12 is simply physisorbed on the silica surface at room temperature. Thermal decomposition occurs under H2 at ≈ 100°C and is complete at $ ̃120°C. During this process CO (10 mol/mol cluster). CO2 (0.25), CH4(0.012) and C2H4 (0.005) are evolved in the gas phase. Simultaneously the iron from the cluster is transformed into mainly particles of metallic iron (35-85 Å) as well as iron carbide and Fe2+. These metal particles appear to be loosely bound to the silica support (low apparent Lamb-Mössbauer factor). The results suggest that these particles of metallic iron or iron carbide are responsible for a Fischer-Tropschlike behaviour which transforms progressively the CO ligands of the starting cluster into CO2 and hydrocarbons.

Original languageEnglish (US)
Pages (from-to)516-529
Number of pages14
JournalSurface Science
Volume156
Issue numberPART 1
DOIs
StatePublished - Jun 3 1985
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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