Fourier transform infrared photoacoustic spectroscopy (FT-IR/PAS) has been used to investigate the reaction of SO<sub>2</sub> in He with CaO and CaCO<sub>3</sub> particles at temperatures between 25 and 900°C. The reaction of SO<sub>2</sub> with CaO occurs at 25°C, while the reaction of CaCO<sub>3</sub> with SO<sub>2</sub> is first evident at 550°C. The initial product of both of these reactions is CaSO<sub>3</sub>. The CaSO<sub>3</sub> then further reacts with SO<sub>2</sub> to form CaSO<sub>4</sub>, CaS<sub>2</sub>O<sub>3</sub>, and CaS at higher temperatures. At 900°C and above, the net production of SO<sub>4</sub><sup>−</sup> and S<sub>2</sub>O<sub>3</sub><sup>−</sup> is decreased because of the decomposition of SO<sub>3</sub><sup>−</sup>. FTIR/PAS depth-profiling experiments indicate the formation of a reaction-limiting product layer of SO<sub>3</sub><sup>−</sup> and SO<sub>4</sub><sup>−</sup> from the above reactions on the surface of the CaO and CaCO<sub>3</sub> particles.

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