Storing Carbon at high temperatures

Metal carbonates
All metal carbonates decompose at high temperatures into metal oxides and Carbon dioxide (CO2) gas. The release of CO2 contributes to the greenhouse effect, raising temperatures and forcing more CO2 to be released. So it's important to know at what temperature metal carbonates decompose.

CarbonatesDecomposition °C
Barium carbonate1360
Lithium carbonate1310
Strontium carbonate1110
Calcium carbonate899
Potassium carbonate>891
Sodium carbonate>851
Rubidium carbonate740
Cesium carbonate610
Magnesium carbonate350
Lead carbonate340
Cadmium carbonate310
Silver carbonate218
Manganese carbonate>200
Zinc carbonate140

Metal carbides
Metal carbides are strong, stable compounds at high temperatures. Diamonds and metal carbides offer the best form in which to store Carbon a high temperatures, but are difficult and expensive to make.

CarbidesMelting °CBoiling °C
Titanium carbide31404820
Tungsten carbide28706000
Tungsten dicarbide28606000
Boron carbide2350>3500
Calcium carbide2300
Iron carbide1837