Trabalho apresentado em evento
Kinetic parameters for thermal decomposition of hydrazine
Fecha
2013-09-01Registro en:
Journal of Thermal Analysis and Calorimetry, v. 113, n. 3, p. 1209-1216, 2013.
1388-6150
10.1007/s10973-013-2968-8
WOS:000323503300027
2-s2.0-84883139641
8498310891810082
7471310113999140
0000-0002-7984-5908
Autor
São José Dos Campos
Universidade Estadual Paulista (Unesp)
Resumen
The propulsion of most of the operating satellites comprises monopropellant (hydrazine - N2H4) or bipropellant (monometilydrazine - MMH and nitrogen tetroxide) chemical systems. When some sample of the propellant tested fails, the entire sample lot shall be rejected, and this action has turned into a health problem due to the high toxicity of N2H 4. Thus, it is interesting to know hydrazine thermal behavior in several storage conditions. The kinetic parameters for thermal decomposition of hydrazine in oxygen and nitrogen atmospheres were determined by Capela-Ribeiro nonlinear isoconversional method. From TG data at heating rates of 5, 10, and 20 C min-1, kinetic parameters could be determined in nitrogen (E = 47.3 ± 3.1 kJ mol-1, lnA = 14.2 ± 0.9 and T b = 69 C) and oxygen (E = 64.9 ± 8.6 kJ mol-1, lnA = 20.7 ± 3.1 and T b = 75 C) atmospheres. It was not possible to identify a specific kinetic model for hydrazine thermal decomposition due to high heterogeneity in reaction; however, experimental f(α)g(α) master-plot curves were closed to F 1/3 model. © 2013 Akadémiai Kiadó, Budapest, Hungary.