Thermogravimétrie - Modélisation cinétique et mécanismes des réactions solide-gaz

Isothermal and isobaric thermogravimetry allows measuring the kinetic rate of chemical transformations of divided or bulk solids. The interpretation of the kinetic curves is based on the separation of time from the thermodynamic variables in the rate equation. "Geometrical" models describing the variations of the speed according to time are presented as well as the tests allowing to verify their hypotheses. The article shows also how to study the "reaction mechanisms" of nucleation and growth from the variations of the kinetic rate with the thermodynamic variables. Numerous examples of reactions of industrial and/or academic interest illustrate the modelling approach as well as the confrontation of the models to the experimental data