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. Rédey

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Changes of electrical properties of dry and wet γ-Al2O3 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 H3O+ and C3H7 + as possible mobile species at low temperature. The increase of electrical conductivity (above 300°C for γ-Al2O3 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
Volume211
Issue number1-4
DOIs
Publication statusPublished - Apr 30 2003

Fingerprint

Aluminum Oxide
propylene
Propylene
Alumina
aluminum oxides
Adsorption
electrical resistivity
adsorption
Electric properties
electrical properties
Lewis Acids
effluents
interactions
Carbon Monoxide
Hydrocarbons
Temperature
surface reactions
Effluents
hydrocarbons
plots

Keywords

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

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Condensed Matter Physics

Cite this

In situ electrical conductivity study of propylene interaction with alumina surface. / Caldararu, M.; Postole, G.; Carata, M.; Chelu, M.; Hornoiu, C.; Ionescu, N. I.; Juchakova, T.; Rédey, A.

In: Applied Surface Science, Vol. 211, No. 1-4, 30.04.2003, p. 156-165.

Research output: Contribution to journalArticle

Caldararu, M, Postole, G, Carata, M, Chelu, M, Hornoiu, C, Ionescu, NI, Juchakova, T & Rédey, A 2003, 'In situ electrical conductivity study of propylene interaction with alumina surface', Applied Surface Science, vol. 211, no. 1-4, pp. 156-165. https://doi.org/10.1016/S0169-4332(03)00223-X
Caldararu M, Postole G, Carata M, Chelu M, Hornoiu C, Ionescu NI et al. In situ electrical conductivity study of propylene interaction with alumina surface. Applied Surface Science. 2003 Apr 30;211(1-4):156-165. https://doi.org/10.1016/S0169-4332(03)00223-X
Caldararu, M. ; Postole, G. ; Carata, M. ; Chelu, M. ; Hornoiu, C. ; Ionescu, N. I. ; Juchakova, T. ; Rédey, A. / In situ electrical conductivity study of propylene interaction with alumina surface. In: Applied Surface Science. 2003 ; Vol. 211, No. 1-4. pp. 156-165.
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