engleski

Investigation of dehydroxylation process 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 453-673 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 curves alpha = f(t) and alpha = f(T) are sigmoidal in shape; their inflection points and the nu(m) point of the curves nu = f(t) and nu = f(T) are interrelated and as 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.

Boehmite; DSC; Gibbsite

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