Mechanism of the thermal decomposition of anhydrous nickel nitrate
1987; Elsevier BV; Volume: 4; Issue: 1-2 Linguagem: Inglês
10.1016/0168-7336(87)80089-x
ISSN1872-7700
AutoresJ. M. Criado, Abraham Barrero Ortega, C. Real,
Tópico(s)Chemical Thermodynamics and Molecular Structure
ResumoThe thermal decomposition of nickel nitrate has been followed by isothermal and non-isothermal thermogravimetry. The anhydrous salt was prepared by dehydrating the corresponding hexahydrate “in situ” at 150 °C. We believe that the above reaction takes place in a single step: Ni(NO3)2 → NiO + 2NO2 + 12O2 It has been shown that this transformation obeys the Avrami-Erofeev law with an exponent n = 2 and an activation energy close to 84 ± 3 kJ mol−1. These results can be interpreted by a reaction mechanism that involves instantaneous nucleation on the surface of the crystal with subsequent growth of the nuclei into particles.
Referência(s)