Study of thermal decomposition kinetics of low-temperature reaction of ammonium perchlorate by isothermal TG

摘要

The kinetics of the thermal decomposition of ammonium perchlorate at temperatures between 215 and 260 ℃ is studied, in this work, by measuring the sample mass loss as a function of time applying the isothermal thermogravimetric method. From the maximum decomposition rate - temperature dependence two different decomposition stages, corresponding to two different structural phases of ammonium perchlorate, are identified. For the first region (215-235 ℃), corresponding to the orthorhombic phase, the mean value of the activation energy of 146.3 kJ mol~(-1), and the pre-exponential factor of 3.43·10~(14) min~(-1) are obtained, whereas for the second region (240-260 ℃), corresponding to the cubic phase, the mean value of the activation energy of 153.3 kJ mol~(-1), and the pre-exponential factor of 4.11·10~(14) min~(-1) are obtained.