Abstract
The calcination of ammonium metavanadate was investigated using simultaneous thermogravimetric analysis (TGA) and differential scanning calorimetry techniques. The decomposition of ammonium metavanadate proceeded in three steps, and kinetic analysis was performed under nonisothermal conditions using an integral composite method. The integral “model-free” method of TGA data at various heating rates suggested that each step be subjected to a single kinetic process. The integral master plot method showed that the calcination reaction for the three steps was best described by accommodated nucleation and nuclei growth kinetic models. Also, the preexponential factors and exact kinetic exponents for these three steps were finally evaluated on the basis of predetermined activation energies and kinetic models. The results of nonisothermal kinetic analysis of the calcination of ammonium metavanadate suggested that this integral composite method was very successful in evaluating kinetic parameters and describing the...
Published Version
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