Fluidized bed coal combustion (FBC) at low temperatures (1100-1300 K) can be combined with sulfur removal by regenerable sorbents. Thermodynamic calculations prove that CaO-containing sorbents, chemically bound to a second compound like Al2O3, will be the best. These compounds can be tested by thermogravimetry (TG) in an SRO (sulfation, regeneration, and oxidation) cycle by which essential properties such as sulfation rate and capacity, and regeneration behavior can be determined.