The thermal decomposition of guanidine perchlorate. Part III. Catalysts and time-lag before ignition

Sublimation of ammonium perchlorate

“…Isothermal samples decompose to form primarily H20, 02, Cl2, and N20 at atmo-spheric pressure and at temperatures between approximately 150 and 350°( the "low-temperature" decomposition),2 while they decompose to form primarily H20, 02, Cl2, and NO at atmospheric pressure and at temperatures between approximately 350 and 420°( the "high-temperature" reaction).2 At higher tem- peratures, isothermal decomposition experiments are difficult to perform since, after a brief induction period, samples experience either thermal explosion or rapid deflagration. 3 Pure AP can support a steady deflagration at atmospheric pressure if its initial temperature exceeds approximately 2700 4-6 and at room temperature for pressures above roughly 20 atm. 6 The primary deflagration products, roughly in the order of decreasing abundance, are H20, 02, NO, HC1, Cl2, N20, and N25 differing from the adiabatic equilibrium composition which is H20, 02, HC1, N2 with very small amounts of Cl2.7 Dissociative sublimation into NH3 and HCIO4 apparently can occur at all temperatures and pressures but is easiest to observe at subatmospheric pressures since it becomes relatively more predominant than other processes (e.g., low-temperature decomposition) as the pressure is decreased.2•8…”