*2.2. Mass Influence*

It is commonly known that di ffusional e ffects play a major role, when kinetic studies are performed in thermoscopes. Ollero et al. [18] have shown that the kinetic results of thermo-gravimetric analyzer (TGA) measurements depend on the geometry and the mass of the sample because of the influence on the local partial pressure distribution within the sample. On the other hand, they also showed that the assumption of a constant temperature throughout the sample is applicable without any significant influence on the results. Therefore, the di ffusional e ffect should be incorporated into the kinetic model by only correcting the frequency factor of the reaction. In this work, the mass influence is considered

through a correction factor *g*(*<sup>m</sup>*0), with *m*0 as the sample mass. The general rate equation, Equation (1), extends to following form to model the reaction rate in the experiment.

$$
\left(\frac{dX}{dt}\right)\_{exp} = \frac{dX}{dt} \text{ g}(m\_0) \tag{9}
$$
