Application of New Organic Fuels in the Direct MgAl₂O₄ Combustion Synthesis

Abstract

The paper presents a new version of MgAl 2 O 4 solution-combustion synthesis, based on the individual reactivity of Mg(NO 3 ) 2 and Al(NO 3 ) 3 with respect to various fuels. Beside the traditionally used fuels (urea, glycine, β-alanine), new organic reducing agents [monoethanolamine, triethanolamine, tris(hydroxymethyl)aminomethane and triethylenetetramine] have also been used. The study of the individual reactivities of Mg(NO 3 ) 2 and Al(NO 3 ) 3 with respect to each of the previously mentioned fuels suggested that there is a predilection of the two metal nitrates for certain fuels: urea is the optimum fuel for Al(NO 3 ) 3 , whereas monoethanolamine represents the most suitable fuel for Mg(NO 3 ) 2 . It has been shown by X-ray diffraction and thermal analysis that the use of a single fuel

On the Effect of Lithium on the Energetics and Thermal Stability of Nano‐Sized Nonstoichiometric Magnesium Aluminate Spinel

“…At higher temperatures, the sample still lost mass in two weak steps up to 1100°C. The total mass loss was about 85%, in accordance with previous works . The mass loss behavior was found to be independent of the spinel stoichiometric ratio or lithium addition.…”

“…The total mass loss was about 85%, in accordance with previous works. [23][24][25][26] The mass loss behavior was found to be independent of the spinel stoichiometric ratio or lithium addition.…”

Solution combustion synthesis of α-cordierite

“…In order to counteract the disadvantage of using redox inert SiO 2 , a fuel mixture of urea and monoethanolamine (molar ratio 13:2) was used in samples 1 and 2, which is supposed to ensure the most exothermic combustion reaction. Our previous results have shown that starting from Mg(NO 3 ) 2 , Al(NO 3 ) 3 (molar ratio 1:2) and a mixture of urea and monoethanolamine (molar ratio 13:2) leads to the formation of pure and well crystallized MgAl 2 O 4 directly from the reaction of combustion [28].…”

Single-step combustion synthesis of YAlO3 powders

“…If urea is a better fuel for aluminium nitrate than glycine [15], in the case of yttrium nitrate, the situation is exactly the opposite: glycine is more suitable than urea [16]. A better fuel triggers a more exothermal combustion reaction.…”