Thermal decomposition of Glucose
The first thermal decomposition step produces mainly water. The mass loss of this step is independent from the heating rate. The mass loss of the second thermal decompostiton step of Glucose, however, is strongly dependent on the heating rate. This is sufficient proof that after the first step the later decomposition follows at least two competing reaction paths.
Already now a proposal can be given for the kinetic model of the whole thermal decomposition process of Glucose (see result of model fit).
It should be emphasized once again that this model has a more formal character. In particular, no information on the proceeding chemistry can be given from thermogravimetric data only. Considerably more information would be obtained by coupling thermogravimetry with mass spectroscopy.
Kinetic Parameters as Result of Nonlinear Regression
|lg A3/s^-1||- 3.54||0.72|
The branched reaction path results in a specific behavior: by changing of the reaction temperature the parts of product C and D are varied.