Application of isoconversional calculation procedure to non-isothermal kinetic study: III. Thermal decomposition of ammonium cobalt phosphate hydrate

The single phase NH4CoPO4 center dot H2O with layered structure was prepared via solid-state reaction at 60 degrees C. Based on the iterative isoconversional calculation procedure, the values of activation energy E-a associated with the first, second and third stages of the thermal decomposition of NH4CoPO4 center dot H2O were obtained, which demonstrate that the three stages are all a single-step kinetic process and can be adequately described by a unique kinetic triplet. The most probable reaction mechanisms of the three stages were estimated by comparison between experimental plots and modeled plots. The values of pre-exponential factor A of the three stages were obtained on the basis of Ea and the reaction mechanisms. (C) 2012 Elsevier ay. All rights reserved.