A multi-functional sorbent is developed for the simultaneous removal of PbCl2 vapor and sulfur dioxide from the combustion gases. The sorbent is tested in a bench-scale reactor at the temperature of 700 degreesC, using simulated flue gas (SFG) containing controlled amounts of PbCl2 and SO2 compounds. The removal characteristics of PbCl2 and SO2, individually and in combination, are investigated. The results show that the mechanism of capture by the sorbent is not a simple physical adsorption process but seems to involve a chemical reaction between the Ca-based sorbent and the contaminants from the simulated flue gas. The porous product layer in the case of individual SO2 sorption is in a molten state at the reaction temperature. In contrast, the combined sorption of lead and sulfur compounds generates a flower-shaped polycrystalline product layer. (C) 2003 Published by Elsevier B.V.