Evaluation of the metal-support interactions - Case of platinum-supported catalysts: Effect of the support nature and the metallic dispersion

A. Douidah, P. Marécot, S. Szabo, J. Barbier

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The potentials of platinum oxidation according to the metallic particle size and the nature of the support have been evaluated. The use of the Fe3+/Fe2+ redox system potentials of platinum oxidation to be defined according to the dispersion of platinum and the nature of the support. By the use of the Gibbs-Helmoltz law (ΔG=-zF ΔE), the comparison with bulk platinum allows the platinum excess free energy to be calculated. It thus appears that the platinum-support interaction decreases following the sequence: Al2O3 > C > SiO2. However, the most important parameter seems to be the size of the particle. Thus, the small particles are oxidised more easily by the Fe3+/Fe2+ redox system. At the end of the process, the size of the most stable particles is defined by a compromise between a decrease of the stability when the dispersion increases and an increase of the metal-support interaction when the particle size decreases.

Original languageEnglish
Pages (from-to)21-31
Number of pages11
JournalApplied Catalysis A: General
Issue number1-2
Publication statusPublished - Feb 8 2002



  • Excess free energy
  • Metal-support interactions
  • Platinum oxidation
  • Platinum-supported catalysts

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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