Adsorption on transition aluminas from in situ capacitance measurements

Monica Caldararu, Georgeta Postole, Mariana Carata, Cristian Hornoiu, Niculae I. Ionescu, Tatiana Ioujakova, Akos Redey

Research output: Contribution to journalArticle

13 Citations (Scopus)


The interaction of water or propylene dipoles with surface of γ-Al 2 O 3 and of a boehmite type alumina between room temperature and 400°C was evaluated from evolution of the apparent capacity/dielectric constant during thermal cycling and under flushing with dry or humid gases (argon, oxygen) and with a mixture containing propylene and air (i.e. in conditions which mimic the catalytic experiment). Data allowed to stipulate that the extent of weak adsorption was higher on γ-Al 2 O 3 , in relation with the higher amount of surface OH groups, as supported by IR data.

Original languageEnglish
Pages (from-to)318-326
Number of pages9
JournalApplied Surface Science
Issue number1-4
Publication statusPublished - Feb 28 2003



  • Alumina
  • Capacity
  • Dehydration
  • Dielectric constant
  • Propylene adsorption
  • Water adsorption

ASJC Scopus subject areas

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

Cite this

Caldararu, M., Postole, G., Carata, M., Hornoiu, C., Ionescu, N. I., Ioujakova, T., & Redey, A. (2003). Adsorption on transition aluminas from in situ capacitance measurements. Applied Surface Science, 207(1-4), 318-326.