Investigation of the pore blockage of a Brazilian dolomite during the sulfation reaction

► TG analyses were applied to investigate the sulfur sorption reactivity by dolomite. ► The pore blockage of dolomite was demonstrated by porosimetry tests. ► The best fits for experimental data were given by the exponential decay. ► The high temperature was more effective than the time of thermal exposure. ► It was possible to quantify the reactivity decrease of dolomite for SO2 sorption.