Thermodynamic, kinetic and surface texture factors in the production of active solids by thermal decomposition

Effect of supercritical CO2 and olive leaf extract on the structural, thermal and mechanical properties of an impregnated food packaging film

“…Kinetic analyses were performed on the thermograms in order to extract the apparent activation energy (Ea) of the degradation step in accordance with the method described by Bigger et al [51]. The method is based on an iterative computerized technique in which various, well-established models [85][86][87][88] are applied to the mass loss curve in order to obtain the best fitting model under the same test conditions and to extract the Ea values. Table 2 shows the results of the TGA fitting analysis and, in general, the fit to the three-dimensional diffusion (D3) and first-order (F1) models are the strongest with the D3 model presenting consistently high R 2 values for the fitting parameter for all samples.…”

Limestone Calcination Nearby Equilibrium: Kinetics, CaO Crystal Structure, Sintering and Reactivity

“…The German–Munir model assumes that CaO grains with initially spherical shape sinter by formation of a neck at contact points, which grows in diameter as matter is transported to the neck region by several possible mechanisms. For calcination in an inert atmosphere, the transport mechanism depends generally on the calcination temperature as compared to the melting temperature T m of the material . In the usual range of calcination temperatures for CaO ( T m = 2886 K) between 700 and 1000 °C, it is 0.33 T m ≲ T ≲ 0.44 T m (in K), which would imply that sintering should occur by surface diffusion of chemical constituents .…”

“…For calcination in an inert atmosphere, the transport mechanism depends generally on the calcination temperature as compared to the melting temperature T m of the material . In the usual range of calcination temperatures for CaO ( T m = 2886 K) between 700 and 1000 °C, it is 0.33 T m ≲ T ≲ 0.44 T m (in K), which would imply that sintering should occur by surface diffusion of chemical constituents . Sintering by lattice diffusion is initiated in most materials at the so-called Tamman temperature T t (around half the melting temperature in K), which is T t ≃ 1170 °C for CaO .…”

Application of Non‐Arrhenius Method for Analyzing the Decomposition Kinetics of SrCO3 and BaCO3

“…To identify g (α), the method developed by Dollimore et al 16,20–23 (Table I) was used. According to this method kinetic function depends on three different parameters of the thermo‐gravimetric results.…”