Thermal Decomposition and Stabilization Studies of ADN with AN Impurities in the Presence of Catalysts
In the present study, Ammonium Dinitramide (ADN) was synthesized by the nitration of Potassium Sulfamate (PS) salt with mixed acids of nitric/sulfuric acid in the ratio of 4:1 at −40 °C. The synthesized ADN was then characterized by using various analytical instruments. The preliminary result obtained has confirmed that the obtained ADN has AN impurities in its crystals. The next attempt was to stabilize synthesized ADN by adding 2% of catalysts by weight. Catalysts used in the present work are Cupric (II) Oxide (CuO), Ammonium Metavandate (NH4VO3), and Copper Chromite (Cu2Cr2O5). Evaporative crystallization method was used to prepare ADN + Catalysts samples. Simultaneous Thermal Analyzer (STA) was used to study the thermal characteristics of prepared samples by using DSC/TG-DTG techniques. All the three catalysts were found to be effective in stabilization of ADN, however NH4VO3 was found to be most effective.
KeywordsADN Thermal stabilization Catalysts DSC TG-DTG
Authors are thankful to the Dptt of Space engg. and Rocketry, Dptt of Applied Chemistry, and Central Instrumentation Facility (CIF), BIT Mesra for providing all the necessary equipments for carrying out present experimentations.
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