Non‐Isothermal Decomposition Kinetics of Alkaline Earth Metal Carbonates

Abstract

The kinetics of thermal decomposition of four synthetic alkaline earth metal carbonates (MgCO3, CaCO3, SrCO3, and BaCO3) 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 MgCO3 and CaCO3 followed two‐dimensional diffusion‐controlled kinetics and the decomposition reaction of SrCO3 and BaCO3 followed a Ginstling–Brounshtein model‐based diffusion‐controlled kinetics.

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“…−E a RT h(P)dt (11) Experimentally, the solid-gas reactions can be performed under isothermal or non-isothermal conditions. An analytical solution to Equation (11) can be obtained for isothermal experiments because the integrand is time independent [51]. However, the accuracy of isothermal techniques has been questioned because the reaction may begin during the heating process.…”

Co-precipitation synthesis of SOFC electrode materials

“…2) is quite similar to that of LM, thus the same attributions can be made. In addition, a third step in weight loss is detected at 840 C; intuitively it can be accounted for the SrCO 3 decomposition, reported to occur in a wide range of temperatures (800e1000 C) [36].…”

Synthesis and characterization of diethyl-dithiocarbamic acid 2-[4-(2-diethylthiocarbamoylsulfanyl-2-phenyl-acetyl)-2,5-dioxo-piperazin-1-yl]-2-oxo-1-phenyl-ethyl ester as new reversible addition-fragmentation chain transfer agent for polymerization of ethyl methacrylate

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