Effect of nanostructured ferrites MFe2O4 (M= Cu, Co, Mg, Zn) on the thermal decomposition of ammonium nitrate

Abstract Ammonium nitrate (NH4NO3) represents a cheap, chlorine-free alternative to ammonium perchlorate for use as an oxidant solid propellants. But its poor ignitability and low burning rate are all disadvantages achieve such purposes. For this reason, it is necessary carry out studies improve combustion characteristics, seeking combine with catalysts or fuels. The present work explores the possibility of improving characteristics by adding ferrites catalysts. Nanostructured MFe2O4 (M= Mg, Co, Cu, Zn) synthesized autocombustion method were tested thermal decomposition reaction under open, partially open sealed conditions. characterized XRD, SEM, UV-vis spectrophotometry Mossbauer spectroscopy. All samples single phased cubic spinel structure average sizes, L, ranging from about 9 (CoFe2O4) 25 nm (CuFe2O4). catalytic effect on NH4NO3 was investigated thermogravimetric analysis differential scanning calorimetry techniques. process also followed in volumetric Sieverts type apparatus. results indicate that only conditions addition these has influence AN. incorporation any decreases onset temperature manifested itself through exothermic reaction, increases amount heat released reaction. Co-ferrite showed best efficiency causing drop around 60 °C. performance correlated electronegativity M2+ cations, which act Lewis acid sites interact gas molecules.