Thermal decomposition reaction kinetics of 1-amino-1, 2, 3-triazolium nitrate

The thermal decomposition kinetics of 1-amino-1, 2, 3-triazolium nitrate [(ATZ) (NO₃)] was investigated by non-isothermal TG-DTG at various heating rates (2, 5, 10, 15, and 20°C · min^-1). The result showed that the thermal decomposition of (ATZ) (NO₃) consisted of two mass-loss stages. Kinetic triplets of the two stages were described by a three-step method. First, the Kissinger and Ozawa methods were used to calculate the apparent activation energies (E) and pre-exponential factors (A) of the two decomposition stages. Second, two calculation methods (Šatava-Šesták and Achar methods) were used to obtain several probable decomposition mechanism functions. Third, three judgment methods (Šatava, double-extrapolation, and Popescu methods) were used to confirm the most probable decomposition mechanism functions. Reaction models of the two stages both are random-into-nuclear and random-growth mechanisms with n=3/2 for the first stage and n=1/3, m=3 for the second stage. The kinetic equations for the two decomposition stages of (ATZ) (NO₃) may be expressed as da/dt=10^13.60 × e^-128970/RT (1-α) [-ln (1-α)]^-1/2 and dα/dt=10^11.40 × e^-117370/RT (1-α) [-ln (1-α)]^2/3. Mathematical expressions for the kinetic compensation effect were derived as A=0.1213E-1.8946 and lgA=0.1149E-2.5426.