In situ electrical conductivity study of propylene interaction with alumina surface

M. Caldararu, G. Postole, M. Carata, M. Chelu, C. Hornoiu, N. I. Ionescu, T. Juchakova, A. Redey

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12 Citations (Scopus)


Changes of electrical properties of dry and wet γ-Al 2 O 3 surface during interaction with a propylene-air mixture was studied in situ, by following a standard protocol of experiments, under simultaneous monitoring of the composition of the inlet/effluent gas. Data were compared with results obtained on a higher surface area alumina (mainly boehmite). Adsorption of water or hydrocarbon is discussed in terms of various possible intermediate species and adsorption sites. IR spectra on CO adsorption were used to identify the effect of temperature on the evolution of Lewis acid sites on the two alumina surfaces. Electrical properties were dominated by protonic conduction, with H 3 O + and C 3 H 7 + as possible mobile species at low temperature. The increase of electrical conductivity (above 300°C for γ-Al 2 O 3 and at 200°C for the other sample), slightly higher in presence of propylene, was in good correlation with the catalytic behavior in propylene oxidation. This increase regained also in tan δ-temperature plots was assigned to the lattice mobilization.

Original languageEnglish
Pages (from-to)156-165
Number of pages10
JournalApplied Surface Science
Issue number1-4
Publication statusPublished - Apr 30 2003


  • Alumina
  • Electrical conductivity
  • Propylene oxidation
  • Proton conductivity
  • Water adsorption

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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    Caldararu, M., Postole, G., Carata, M., Chelu, M., Hornoiu, C., Ionescu, N. I., Juchakova, T., & Redey, A. (2003). In situ electrical conductivity study of propylene interaction with alumina surface. Applied Surface Science, 211(1-4), 156-165.