Non-Isothermal Degradation Kinetics of CaCO₃ from Different Origin

Table 2

Effect of the heating rate on the kinetic data for the thermal decomposition of reagent-grade CaCO₃ .

Heating rate	Calculation procedure
	Coats-Redfern			Madhysudanan-Krishnan-Ninan
K min^−1	E, kJ mol^−1	A, min^−1	R ^2	E, kJ mol^−1	A, min^−1	R ^2
3	290.4	2.42 × 10^14	0.9981	290.4	1.610 × 10^14	0.9980
6	329.0	1.96 × 10^16	0.9978	329.3	2.14 × 10^16	0.9978
9	329.2	1.66 × 10^14	0.9973	329.5	1.81 × 10^16	0.9973
12	353.3	2.60 × 10^17	0.9973	353.6	2.81 × 10^17	0.9971
Average	325.1 ± 35	7.41 × 10^16	0.9976	325.7 ± 35	8.02 × 10^16	0.9976
		Tang et al.			Wanjun et al.
3	290.5	1.64 × 10^14	0.9980	290.1	1.56 × 10^14	0.9980
6	329.4	2.16 × 10^16	0.9978	329.0	1.96 × 10^16	0.9978
9	329.5	1.82 × 10^16	0.9973	329.2	1.68 × 10^16	0.9973
12	353.6	2.83 × 10^17	0.9971	367.7	2.63 × 10^17	0.9973
Average	325.7 ± 30	8.07 × 10^16	0.9976	329.0 ± 39	7.50 × 10^16	0.9976