Thermal Decomposition Kinetics of Sr(C_6H_4NO_2)_2·3H_2O

The thermal decomposition process and kinetics of [Sr(C6H4NO2)2·3H2O] were investigated by TG-DTG/DTA. Following the non-isothermal kinetics theory and Flynn- Wall- Ozawa, Kissinger, Friedman and Freeman – Carroll methods, the kinetic parameters of the thermal decomposition of [Sr(C6H4NO2)2·3H2O] were obtained. The results show that the pyrolysis process can be divided into three steps: the first step is the loss of crystallized water; the second and the third steps are the loss of ligands and the collapse of the complex structure, respectively. The kinetic equations for the thermal decomposition steps were obtained by the Coats-Redfern method. The results calculated for each step are: E =(68.03±0.38),(369.98±9.76),(255.53±7.53) kJ·mol-1(activation energy(E)), lgA =7.68, 24.69, 12.88(frequency factor(A)); n =1.1, 2.8, 1.4(reaction order(n)), respectively. A possible kinetic model is established as F1(n =1), 2D(n =2), AE4(n =4) via the multiple linear regression method.