Investigation of dehydroxylation of gibbsite into boehmite by DSC analysis

The dehydroxylation of gibbsite into boehmite was investigated by means of DSC analysis under non-isothermal conditions in the temperature range 453-673K at heating rates from 2.5 to 20.0K min exp -1 . Mathematical analysis of the experimental DSC curves revealed the mechanism and kinetics of the gi...

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Bibliographic Details
Published in:Journal of thermal analysis 1996-05, Vol.46 (5), p.1339-1347
Main Authors: PERIC, J, KRSTULOVIC, R, VUCAK, M
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
Inorganic chemistry and origins of life
Kinetics and mechanism of reactions
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Summary:The dehydroxylation of gibbsite into boehmite was investigated by means of DSC analysis under non-isothermal conditions in the temperature range 453-673K at heating rates from 2.5 to 20.0K min exp -1 . Mathematical analysis of the experimental DSC curves revealed the mechanism and kinetics of the gibbsite dehydroxylation process. The kinetic curves alpha =f(t) and alpha =f(T) are sigmoidal in shape; their inflection points and the v sub m point of the curves v=f(t) and v=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 453-673K is 132.92plus/minus 8.33-142.26plus /minus8.33 kJ mol exp -1 .
ISSN:0368-4466
1572-8943
DOI:10.1007/BF01979247