Journal of thermal analysis

, Volume 46, Issue 5, pp 1339–1347 | Cite as

Investigation of dehydroxylation of gibbsite into boehmite by DSC analysis

  • J. Perić
  • R. Krstulović
  • M. Vučak
Article

Abstract

The dehydroxylation of gibbsite into boehmite was investigated by means of DSC analysis under non-isothermal conditions in the temperature range 453–673 K at heating rates from 2.5 to 20.0 K min−1. Mathematical analysis of the experimental DSC curves revealed the mechanism and kinetics of the gibbsite dehydroxylation process. The kinetic curvesα=f(t) andα=f(T) are sigmoidal in shape; their inflection points and the νm point of the curvesν=f(T) andν=f(T) are interrelated and are defined by the concept of a stationary point. The activation energy for the first stage of gibbsite dehydroxylation in the temperature range 453–673 K is 132.92±8.33–142.26±8.33 kJ mol−1.

Keywords

boehmite DSC gibbsite 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    V. Šatava, Thcrmochim. Acta, 2 (1971) 423.CrossRefGoogle Scholar
  2. 2.
    R. Vračar, M. Tecilazić-Stevanović, D. Sinadinović and T. Janačković, 4th International Congress ICSOBA, Athens, 1978, Vol. 2, 937/950.Google Scholar
  3. 3.
    D. Blečić, Ž. Živković and M. Martinović, Thermochim. Acta, 60 (1983) 61.CrossRefGoogle Scholar
  4. 4.
    D. Blečić and Ž. Živković, 3. sav. probl. proizv., prer. i potr. boks., glinice i alum. Jug., Šibenik 1984, Zb. rad., 243/252.Google Scholar
  5. 5.
    J. Perić, R. Krstulović, T. Ferić, M. Vučak, Travaux ICSOBA, 20–21 (1991) 35.Google Scholar
  6. 6.
    DSC-4 Standard Program Manual (Perkin-Elmer Part No. 0993-9823).Google Scholar
  7. 7.
    M. Antić and N. Colović, Kinetika heterogenih hemijskih reakcija, Institut zaštite na radu. Niš, 1083, 269/278.Google Scholar
  8. 8.
    J. Perić, R. Krstulović, T. Ferić and M. Vučak, Thermochim. Acta, 207 (1992) 245.CrossRefGoogle Scholar
  9. 9.
    L. Candela and D. D. Perlmutter, Ind. Eng. Chem. Res., 31 (1992) 694.CrossRefGoogle Scholar

Copyright information

© Akadémiai Kiadó 1996

Authors and Affiliations

  • J. Perić
    • 1
  • R. Krstulović
    • 1
  • M. Vučak
    • 1
  1. 1.Faculty of TechnologyUniversity of SplitSplitCroatia

Personalised recommendations