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
By means of model calculations it could be shown for an irreversible surface reaction of 1st order that the determination of the activation energy of the desorption of the reactant or, respectively, of the surface reaction is possible by application of the method of variation of the heating rate to the desorption curve of the reactant, according to circumstances whether the ratio of the activation energy of the surface reaction and of the desorption of the reactant is greater or smaller than one.
(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.
The thermal decomposition of three new reagent cyclohexylamine-p-tolylglyoxime (L1H2), tertiarybutyl amine-p-tolylglyoxime (L2H2) and secondary butylamine-p-tolylglyoxime (L3H2 and their Co-complexes were studied by both isothermal and nonisothermal methods. As expected, the complex structure of Co-complexes,
different steps with different activation energies were realized in decomposition process. Model-fitting and model-free kinetic
approaches were applied to nonisothermal and isothermal data. The kinetic triplet (f(α), A and E) related to nonisothermal model-fitting method can not be meaningfully compared with values obtained from isothermal method.
The complex nature of the multi-step process of the studied compounds was more easily revealed using a wider temperature range
in nonisothermal isoconversional method.
The title polymer was obtained electrochemically by the reduction of 4,4'-bis(dibromomethyl)-2,2'-dimethoxybiphenyl under
very smooth conditions. The DSC and TG/DTG curves registered at four different heating rates showed that the polymer is stable
in air up to 150C, where smooth degradation starts. Above 300C, decomposition is fast and exothermic (ΔH= –323 J g–1) . The activation energy (1164 kJ mol–1 ) was determined by Ozawa's method.
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
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
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