The research including two sorbents produced by the activation of quicklime, transforming calcium oxide into calcium hydroxide and calcium carbonate proved by means of a reactor with a static layer that temperature significantly limits their chemisorption reactivities during the capture of sulfur dioxide from boiler flue gas from coal combustion and biomass co-combustion or sorted municipal flues and brown coal. An increased desulfurization reactivity was demonstrated with a product with a lower hydroxide and higher carbonate content. Its sorption activity was proven to be significantly higher at 110 degrees C than at 130 degrees C and 150 degrees C. The desulfurization was getting stronger with the decrease of the difference of Sorbacal application temperature to the dew point of flue gasses. (c) 2013 Elsevier B.V. All rights reserved.