Investigation of dehydroxylation of gibbsite into boehmite by DSC analysis
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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.
Keywordsboehmite DSC gibbsite
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- 2.R. Vračar, M. Tecilazić-Stevanović, D. Sinadinović and T. Janačković, 4th International Congress ICSOBA, Athens, 1978, Vol. 2, 937/950.Google Scholar
- 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.J. Perić, R. Krstulović, T. Ferić, M. Vučak, Travaux ICSOBA, 20–21 (1991) 35.Google Scholar
- 6.DSC-4 Standard Program Manual (Perkin-Elmer Part No. 0993-9823).Google Scholar
- 7.M. Antić and N. Colović, Kinetika heterogenih hemijskih reakcija, Institut zaštite na radu. Niš, 1083, 269/278.Google Scholar