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. Szabó, J. Barbier

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

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
Volume225
Issue number1-2
DOIs
Publication statusPublished - Feb 8 2002

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Platinum
Catalyst supports
Metals
Particle size
Oxidation
Free energy

Keywords

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

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Evaluation of the metal-support interactions - Case of platinum-supported catalysts : Effect of the support nature and the metallic dispersion. / Douidah, A.; Marécot, P.; Szabó, S.; Barbier, J.

In: Applied Catalysis A: General, Vol. 225, No. 1-2, 08.02.2002, p. 21-31.

Research output: Contribution to journalArticle

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