Sorption, of sulfur dioxide (SO2) was carried out on calcium-based sorbents under dynamic conditions in a fixed bed. The experimental conditions were reaction temperature (700 to, 1 000degreesC), SO2 concentration (1000-10 000 ppm), sorbent particles, size (1 to 2 mm) and the types of sorbents (hydroxide or carbonate). The sorption process was found to be effective at low concentration levels (less than 10 000 ppm). as the breakthrough time significantly decreased with increase in concentration. The maximum removal of SO2 was observed at a reaction temperature of 950degreesC. The hydroxide-based sorbents of relatively smaller particle size were found to exhibit superior sorption performance in terms of longer breakthrough time and higher sulfate conversion. A mathematical. model developed,Assuming a porous structure of the sorbent materials the low sulfation conversion during SO2 sorption due to a pore diffusion mechanism.