Glycine-nitrate combustion synthesis of finely dispersed alumina

Solution combustion synthesis of α-Al2O3 using urea

“…Under similar conditions, the temperature of the combustion mixture of aluminium nitrate with glycine reached only 570 1C (Fig. 2), and the product consists of an amorphous aluminium oxide and carbon [14].…”

“…The aluminium oxide obtained by combustion with urea at j ¼ 1.2 was white in colour with a greenish tint and did not contain carbon impurities, whereas the use of glycine with a relatively high carbon content resulted in an increase in the carbon content of the final product [14]. Such an advantage of urea as a fuel may be explained by the absence of carbon-carbon bonds in the urea molecule.…”

“…This method has also been successfully applied to the production of alumina [9][10][11][12][13][14][15] and other Al-based compounds [16][17][18][19][20][21][22][23][24][25].…”

“…The SCS process is based on redox reactions between metal salts and reducing agents such as glycine [12,14,16,21] or urea [9][10][11][12]17,18,24,25]. Generally, an organic reducing agent should also be a complexing agent.…”

“…In the reactions of aluminium nitrate with glycine, as a rule, there is a formation of an amorphous product, which upon annealing up to 600-800 1C transforms into g-Al 2 O 3 [13][14][15]. The annealing temperature for a-Al 2 O 3 should be above 1000 1C.…”