Studies on the thermal behavior of ammonium permanganate

The thermal decomposition of ammonium permanganate was studied by thermogra vimetry-mass spectrometry (TG-MS). A Perkin Elmer TGS-2 thermobalance and a Hiden's HAL 3F/PIC mass spectrometer equipped with a fast ion counter was used. Products of thermal decomposition of ammonium permanganate are oxygen, mang anese oxides, water and ammonia. There is no gas phase oxidation of ammonia by oxygen. The possible intermediates of low-temperature decomposition rea ction are ammonium nitrite or nitrate which transform into N-2, N2O, or H2O . The oxidation of adsorbed ammonia by manganese oxides via the superoxide active centers takes place on the surface of manganese oxide. (C) 1999 Else vier Science B.V. All rights reserved.