Hydrothermal reaction kinetics. The decomposition of nickel(II) hydroxide
Open Access
- 1 February 1978
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Chemistry
- Vol. 56 (3) , 363-369
- https://doi.org/10.1139/v78-058
Abstract
The fractional extent α of decomposition of ripened Ni(OH)2 into green NiO in alkaline hydrothermal conditions under nitrogen is given by the rate law α1/3 = kc[OH−]t, where kc = 2.4 × 10−5 kg mol−1 s−1 at 561 K. The Arrhenius activation energy is 220 + 25 kJ mol−1. The reaction is accelerated moderately by O2 (giving black NiO1+δ) and strongly by added NiO. A reaction mechanism involving dissolution of Ni(OH)2 as Ni(OH)3− (aq) and rate-determining, surface-controlled reprecipitation of this as NiO is proposed.Keywords
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