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New organic fuels with applications in the direct MgAl2O4 low-temperature combustion synthesis
|Robert Ianoş 1, Ioan Lazău 1, Cornelia Păcurariu 1, Paul C. Barvinschi 2|
1. Politehnica University of Timişoara, P-ţa Victoriei no. 2, Timisoara 300006, Romania
Starting from our previous results, which have shown that there is a predilection of metal nitrates with respect to certain fuels, the paper presents the exploitation of new organic compounds in the direct magnesium aluminate low temperature combustion synthesis, thus playing an import role in the diversification of the fuel range.
Mg(NO3)2·6H2O and Al(NO3)3·9H2O were used as oxidizing agents. Alongside the already well-known reducing agents, such as urea (U), glycine (Gly) or β-alanine (β-Ala), new organic compounds with nitrogen content have been tested: monoethanolamine (MEA), triethanolamine (TEA), trihydroxymethylaminomethane (THMAM) and triethylentetramine (TETA). The experimental results pointed out that, using a single fuel, the synthesis of a pure, well-crystallized spinel cannot be achieved unless subsequent thermal treatments are applied.
On the other hand, the use of optimum fuel mixtures (U + MEA, U + β-Ala, U + Gly) next to the desired metal nitrates allows the direct synthesis of pure highly crystalline spinel, without any additional calcination phase. In this way, a whole new perspective has been opened concerning the direct combustion synthesis of magnesium aluminate, in particular, and other oxide compounds in general, by eliminating the annealing phase, which is practically indispensable in most of the unconventional synthesis methods.
Presentation: Oral at E-MRS Fall Meeting 2007, Symposium A, by Robert Ianoş
See On-line Journal of E-MRS Fall Meeting 2007
Submitted: 2007-04-16 11:14 Revised: 2009-06-07 00:44