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 Satava-Sestak 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 (Delta H), entropy (Delta S) and Gibbs free energy (Delta G) were calculated. (c) 2012 Elsevier B.V. All rights reserved.