Journal ArticleDOI
Kinetics of Thermal Decomposition of Cubic Ammonium Perchlorate
TLDR
In this paper, a new computational technique (advanced isoconversional method) has been used to determine the dependence of the effective activation energy (Eα) on α for isothermal and nonisothermal TGA data.Abstract:
The methods of thermogravimetric analysis (TGA) and differential scanning calorimettry (DSC) have been used to study the thermal decomposition of ammonium perchlorate (AP). TGA curves obtained under both isothermal and nonisothermal conditions show a characteristic slowdown at the extents of conversion, α = 0.30−0.35. DSC demonstrates that in this region the process changes from an exothermic to an endothermic regime. The latter is ascribed to dissociative sublimation of AP. A new computational technique (advanced isoconversional method) has been used to determine the dependence of the effective activation energy (Eα) on α for isothermal and nonisothermal TGA data. At α > 0.1, the Eα dependencies obtained from isothermal and nonisothermal data are similar. By the completion of decomposition (α → 1) the activation energy for the isothermal and nonisothermal decomposition respectively rises to ∼110 and ∼130 kJ mol-1, which are assigned to the activation energy of sublimation. The initial decomposition (α → ...read more
Citations
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Journal ArticleDOI
Computational aspects of kinetic analysis: Part A: The ICTAC kinetics project-data, methods and results
Michael E. Brown,Marek Maciejewski,Sergey Vyazovkin,R. Nomen,J. Sempere,Alan K. Burnham,J. Opfermann,R. Strey,H. L. Anderson,A. Kemmler,R. Keuleers,J.F. Janssens,H.O. Desseyn,Chao-Rui Li,Tong B. Tang,B. Roduit,Jiří Málek,Takefumi Mitsuhashi +17 more
TL;DR: The results of the ICTAC Kinetics Project as mentioned in this paper have been used to forecast the tendencies for the future development of solid state kinetics, as well as the findings of the participants are compared.
Journal ArticleDOI
Computational aspects of kinetic analysis. Part C. The ICTAC Kinetics Project — the light at the end of the tunnel?
TL;DR: The results of the ICTAC Kinetics Project have been discussed in this article, where the authors have applied various model-free techniques that employ multiple sets of isothermal or nonisothermal data obtained at different temperatures or/and at different heating rates.
Journal ArticleDOI
Catalytic effects of nano additives on decomposition and combustion of RDX-, HMX-, and AP-based energetic compositions
TL;DR: In this paper, the effects of nano-sized additive on decomposition kinetics, reaction models, decomposition mechanisms and burning rates, pressure exponents, combustion wave structures, and flame propagation of RDX-, HMX-, and AP-based energetic compositions are discussed.
Journal ArticleDOI
Pyrolysis treatment of oil sludge and model-free kinetics analysis
TL;DR: Various approaches including thermogravimetric analysis, CNHS/O elemental analysis, electrically heated fixed bed quartz reactor coupled with Vario Plus emission monitoring system, and oil-gas evaluation workstation equipped with a flame ionization detector (FID) were used to investigate pyrolysis of tank bottom oil sludge.
Journal ArticleDOI
What is meant by the term ‘variable activation energy’ when applied in the kinetic analyses of solid state decompositions (crystolysis reactions)?
TL;DR: The proposed introduction of this term, E (variable), is a retrograde step, unlikely to advance science through the development of theory, and its use is not recommended for reasons that are explained.
References
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Journal ArticleDOI
A New Method of Analyzing Thermogravimetric Data
TL;DR: In this paper, a new method of obtaining the kinetic parameters from thermogravimetric curves has been proposed, which is simple and applicable to reactions which can not be analyzed by other methods.
Journal ArticleDOI
General treatment of the thermogravimetry of polymers
Joseph H. Flynn,Leo A. Wall +1 more
TL;DR: It is concluded that methods involving a variable rate of heating or involving several thermogravimetric traces at different rates of heating are capable of establishing the uniqueness of kinetic parameters.
Journal ArticleDOI
Evaluation of activation energy of thermally stimulated solid‐state reactions under arbitrary variation of temperature
TL;DR: In this paper, the authors proposed a method to take into account the effect of temperature deviations on kinetic evaluations by combining the isoconversional principle of evaluating the activation energy with numerical integration of the equation.
Journal ArticleDOI
Kinetics in solids
TL;DR: How an alternative "model-free" approach to kinetic analysis, which is based on the isoconversional method, can overcome some of these limitations of the widely practiced force fitting of experimental data to simple reaction-order kinetic models is discussed.
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A unified approach to kinetic processing of nonisothermal data
TL;DR: In this paper, the dependence of the activation energy on conversion has been used to predict the behavior of a substance outside the range of experimental temperatures, which can also be used to solve applied kinetic problems.