Thermal decomposition kinetics of glycine in nitrogen atmosphere

The non-isothermal decomposition kinetics of glycine was investigated using analyzer DTG-60. TG experiments were carried out under dynamic nitrogen atmosphere of 30 mL min−1 with heating rates of 10, 14, 18 and 22 K min−1. The kinetic parameters such as activation energy (E), exponential factor (A) and reaction order (n) were evaluated by Flynn–Wall–Ozawa, Doyle, Kissinger and Šatava-Šesták methods. The results show that the non-isothermal decomposition mechanism of glycine corresponds to nucleation and growth, following the Avrami–Erofeev equation with n = 1/3. Moreover, thermodynamic properties of the non-isothermal decomposition process such as the change in the values of enthalpy (ΔH), entropy (ΔS) and Gibbs free energy (ΔG) were calculated.

► Thermal decomposition kinetic of the glycine was studied by TG-DTA methods. ► F–W–O, Doyle, Kissinger and Šatava-Šesták methods were applied. ► The thermal decomposition mechanism of glycine are nucleation and growth. ► The thermodynamic parameters of decomposition of glycine has been confirmed.