A silico alumino phosphate with AFI structure (SAPO-5) was prepared
in a two-phase medium and characterized by XRD, followed by the addition of
TEA+. The kinetics of the TEA+/SAPO-5
thermal decomposition reaction was studied by isothermal and dynamic thermogravimetry.
Two kinetic models, D3 and D4
based on diffusion processes were found as best to fit the isothermal data.
On the other hand, the best fit for the dynamic data is the F1
first order reaction model. According to the apparent activation energy values,
the use of the dynamic method indicates a higher temperature dependence than
the isothermal method.