A Multifaceted Kinetic Model for the Thermal Decomposition of Calcium Carbonate

Abstract

The existing kinetic models often consider the influence of a single factor alone on the chemical reaction and this is insufficient to completely describe the decomposition reaction of solids. Therefore, the existing kinetic models were improved using the pore structure model. The proposed model was verified using the thermal decomposition experiment on calcium carbonate. The equation has been modified as fα=n1−α1−1n−ln1−α−1m1−ψln1−α12. This led to the conclusion that the pore structure, generated during the thermal decomposition of calcite, has an important influence on the decomposition kinetics. The existing experimental data show that the improved model, with random pores as the main body, reasonably describes the thermal decomposition process of calcite.

Damage Characteristics of Thermally Deteriorated Carbonate Rocks: A Review

“…To study thermal damage characteristics and decomposition of carbonate minerals, several techniques have been utilized, such as thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), differential thermal analysis (DTA), thermo-balance, scanning electron microscopy, optical microscopy, X-ray diffraction, high-temperature X-ray diffraction, etc. [34][35][36][37][38][39][40][41][42][43][44][45][46][47][48]. A summary of major developments and employed quantitative methods regarding the decomposition of carbonate minerals is provided in Table 1.…”

Insights into a co-precursor driven solid-state thermal reaction of ferrocene carboxaldehyde leading to hematite nanomaterial: a reaction kinetic study

“…Among several thermo-analytical methods, the nonisothermal thermogravimetry (TG) is a popular method to explore solid-state thermal reactions, 21,25,26 where analysis of the TG proles (i.e., mass vs. temperature plots obtained at constant heating rates) based on iso-conversional procedure allows the evaluation of the kinetic parameters (activation energy, reaction mechanism function and reaction rate) and predicts the mechanism of the rate-controlled conversion reaction. The isoconversional model free integral methods 21,23,25,[27][28][29][30][31][32] are mostly employed to evaluate the activation energy quite accurately over a range of temperatures utilizing the TG data obtained at different heating rates, and these integral methods are dependent on certain approximations used in solving specic temperature integrals.…”