Fig. 4: Equilibrium constant for CO2 release for a range of alkali and alkali earth carbonates.
From: A new electrolyte for molten carbonate decarbonization

The equilibrium constants as a function of temperature for strontium, lithium, sodium, potassium, and barium carbonate. The equilibrium constants are calculated from the free energy according to Eq. 5. The free energy is calculated from the metal carbonate, metal oxide, and carbon dioxide enthalpies and entropies2,69,70,71,72.