Authors:Halil Cetişli, Gülbanu Koyundereli Çılgı, and Ramazan Donat
literature about kineticanalysis of each decomposition stages. This conflict and deficiency have indicated a need for more studies on the thermal decomposition of uranyl oxalate.
In this study, thermal decomposition of UO 2 C 2 O 4 ·3H 2 O compound
isothermal data. One of prerequisites for this kineticanalysis is to get data of conversion rate of high accuracy.
Thus if we observe the non-stoichiometry by changing temperature frequency and extract combined data of conversion and rate of conversion
For complex decomposition reactions, traditional methods, such as TG and DSC cannot fully resolve all of the steps in the
reaction. Evolved gas analysis (EGA) offers another tool to provide more information about the decomposition mechanism. The
decomposition of sodium bicarbonate was studied by TG, DSC and EGA using a simultaneous thermal analysis unit coupled to a
FTIR. The decomposition of sodium bicarbonate involves two reaction products H2O and CO2, which are not evident from either TG or DSC measurements alone. A comparison of the reaction kinetics from TG, DTG and EGA
data were compared.
(activation energy, pre-exponential factor, and conversion function) of each degradation step is one important target of kinetic investigations. Many kineticanalysis methods have been developed, among which isoconversional methods have been widely used [ 1
Advanced software (TKS-SP2.0 version) for thermal and kinetic analysis, for determining the non-isothermal kinetic parameters
of heterogeneous processes has been developed. The dynamic handle of conversion degree steps and ranges, heating rates and
kinetic models, makes the evaluation of the kinetic parameters much faster, for TG, TPR and dilatometry experiments. The standard
procedure for evaluating the kinetic triplet was implemented; several linear isoconversional methods (from generalized KAS
to FWO, Li-Tang and Friedmann methods), IKP method, Perez-Maqueda et al. criterion (both by Differential equation) and Master plots method. The software is designed mainly for data processing of
experimental files, but may also import other already transformed numeric data.
Authors:Gülbanu Koyundereli Çılgı, Halil Cetişli, and Ramazan Donat
, there is a gap in the academic literature about kineticanalysis of each decomposition stage of uranyl acetate salts. However, the kinetic and thermodynamic findings play an important role in solid-state chemistry. This situation has indicated a need for
In this research, thermogravimetry (TG/DTG) was used to determine the kinetic analysis of different coals and effect of cleaning process on kinetic parameters of raw and cleaned coal samples from Soma, Tuncbilek and Afsin Elbistan regions. Kinetic parameters of the samples were determined using Arrhenius and Coats and Redfern kinetic models and the results are discussed.
In principle, the kinetic analysis of thermal effects has limitations when based on a single measurement. Using a simulated
example and the dehydration of Ca(OH)2 , it will be shown that, through the simultaneous application of non-linear regression to several measurements run at different
heating rates (multivariate non-linear regression), the difficult problem of determining the probable reaction type can be
reactions due to chemical complexity. Many researchers regarded the biomass as consisting of multiple pseudo components to simplify the decomposition kineticanalysis, thereby different apparent kinetic models were suggested to describe the mass loss
Authors:J. Criado, P. Sánchez-Jiménez, and L. Pérez-Maqueda
A critical study of the use of isoconversional methods for the kinetic analysis of non-isothermal data corresponding to processes
with either a real or an apparent variation of the activation energy, E, with the reacted fraction, α, has been carried out using for the first time simulated curves. It has been shown that the
activation energies obtained from model-free methods are independent of the heating rate. However, the activation energy shows
a very strong dependence of the range of heating rates used for simulating the curves if the apparent change of E with α is caused by overlapping processes with different individual activation energies. This criterion perhaps could be
used for determining if a real dependence between E and α is really occurring.