Kinetics of the thermal decomposition of cobaltic acid, CoO(OH)
- 1 January 1982
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 8,p. 1407-1409
- https://doi.org/10.1039/dt9820001407
Abstract
The isothermal decomposition of cobaltic acid, CoO(OH), has been examined. Two mechanisms are found to operate : above 300 °C, phase-boundary control in two dimensions dominates with an activation energy of 101 kJ mol–1; below 290 °C, a nucleation and growth mechanism is appropriate, the activation energy being 214 kJ mol–1. Kinetic data have been analysed by a wide variety of methods all leading to essentially the same conclusions. At all temperatures the product of decomposition is the microcrystalline spinel Co3O4. A preliminary study of a sample of the mineral heterogenite has also been undertaken, the activation energy obtained for its decomposition being 109 ± 20 kJ mol–1. A small amount of occluded water made this work difficult.Keywords
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