Regular paperThe thermal dehydration of solid ammonium copper(II) sulphate hexahydrate

Add time:08/19/2019    Source:sciencedirect.com

The thermal decomposition of ammonium copper(II) sulphate hexahydrate has been studied at temperatures between 339 and 393 K over a range of water vapour pressures. The compound loses four molecules of water of crystallisation in this temperature range, showing Avrami-Erofeyev kinetics at low temperature, changing to contracting-disc kinetics above 350 K. The Arrhenius parameters for the Avrami-Erofeyev region are E = 170 kJ mol−1 and A = 2.1 × 1021 s−1, while the contracting-disc kinetics show E = 82 kJ mol−1 and A = 2.2 × 108 s−1. There is no observable effect from variation in water vapour pressure. Microscopy has been used to clarify the kinetics.

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