Ammonium nitrate thermal decomposition with additives

Optimization of Synthesis Parameters for the Production of Biphasic Calcium Phosphate Ceramics via Wet Precipitation and Sol‐Gel Process

“…and then via the exothermic reactions presented in Equation (6) and …”

Oxidatively induced exposure of active surface area during microwave assisted formation of Pt3Co nanoparticles for oxygen reduction reaction

“…The exact exothermal decomposition mechanism of NH 4 NO 3 is known to be complex and highly dependent of a large variety of environmental and heating factors. [45][46][47] Thus, the precise intermediates responsible for the oxidative treatment cannot be easily determined. We note however that NH 4 NO 3 and other nitrate salts have been employed as an additive in a number of combustion synthesis methods, 48 even as a combustion aid in solution-phase microwave synthesis.…”

Evaluation of the modified reduction/expansion synthesis in the production of nanoparticulate alumina

“…The faceted structures are made of article that have an average particle sizes between 50 and 150 nm. Transferring the mixed paste of aluminum nitrate and urea from room temperature to a preheated oven involves an extremely fats heating of the mixture, leading to a thermal decomposition of the mixture in a temperature range between 160 to 250 o C, depending of the paste composition [7,12,13,15,16]. Aluminum nitrate decomposition has been reported to start at temperatures as low as 150 o C [15], meanwhile urea decomposes in a first stage between 180 -250 o C to form ammonium and isocianic acid followed by a further decomposition of the isocianic acid to a gaseous mixture of ammonium and carbon dioxide at temperatures above 350 o C [10,12].…”

“…Transferring the mixed paste of aluminum nitrate and urea from room temperature to a preheated oven involves an extremely fats heating of the mixture, leading to a thermal decomposition of the mixture in a temperature range between 160 to 250 o C, depending of the paste composition [7,12,13,15,16]. Aluminum nitrate decomposition has been reported to start at temperatures as low as 150 o C [15], meanwhile urea decomposes in a first stage between 180 -250 o C to form ammonium and isocianic acid followed by a further decomposition of the isocianic acid to a gaseous mixture of ammonium and carbon dioxide at temperatures above 350 o C [10,12]. In the case of the aluminum nitrate, the initial stage of decomposition below 170 o C, comprises a series of simultaneous reactions such as dehydration, hydrolysis, and destruction of nitrate groups sharing comparable reaction mechanism to processes such as dehydroxylation of hydroxy salts, that also could be formed during the thermal decomposition of hydrolytic processes that take place at temperatures above 170 o C. Therefore, stoichiometric and thermodynamics conditions of the mix at the initial moment of decomposition may lead to the formation of an initial hydroxyl compound of the type Alx(OH)y(NO3), the nitrate molecules decomposes rapidly due to the thermodynamic favorable reaction to the formation of ammonium in the presence of urea.…”