Non‐Isothermal Decomposition Kinetics of Alkaline Earth Metal Carbonates

Abstract

The kinetics of thermal decomposition of four synthetic alkaline earth metal carbonates (MgCO 3 , CaCO 3 , SrCO 3 , and BaCO 3 ) was studied under non‐isothermal conditions using thermo‐gravimetry. The activation energy and the pre‐exponential factor for the decomposition reactions were determined using the Agarwal and Sivasubramanium integral approximation method. A new method was developed using a Turbo‐C‐based computer program to evaluate the integral of the kinetic equation. It was observed that the decomposition reaction of MgCO 3 and CaCO 3 followed two‐dimensional diffusion‐controlled kinetics and the decomposition reaction of SrCO 3 and BaCO 3 followed a Ginstling–Brounshtein model‐based diffusion‐controlled kinetics.