Non-Isothermal Degradation Kinetics of CaCO₃ from Different Origin

Table 6

Kinetics parameters obtained with the most probable mechanism function g(α) using Ozawa-Flynn-Wall and Kissinger-Akahira-Sunose calculation procedures.

Parameters	Reagent-grade CaCO3		In situ produced CaCO3
	OFW	KAS	OFW	KAS
E, kJ mol^−1	166.9	159.3	137.8	133.5
A, min^−1	5.69 × 10^7	5.46 × 10^7	2.25 × 10^6	1.11 × 10^6
−Δ𝑆^≠, J mol^−1K^−1	148.7	149.1	175.6	181.5
Δ𝐻^≠, kJ mol^−1	158.7	151.3	129.6	125.3
Δ𝐺^≠, kJ mol^−1	304.9	297.9	302.2	303.7