Abstract

Fourier transform infrared photoacoustic spectroscopy (FT-IR/PAS) has been used to investigate the reaction of SO₂ in He with CaO and CaCO₃ particles at temperatures between 25 and 900°C. The reaction of SO₂ with CaO occurs at 25°C, while the reaction of CaCO₃ with SO₂ is first evident at 550°C. The initial product of both of these reactions is CaSO₃. The CaSO₃ then further reacts with SO₂ to form CaSO₄, CaS₂O₃, and CaS at higher temperatures. At 900°C and above, the net production of SO₄⁻ and S₂O₃⁻ is decreased because of the decomposition of SO₃⁻. FTIR/PAS depth-profiling experiments indicate the formation of a reaction-limiting product layer of SO₃⁻ and SO₄⁻ from the above reactions on the surface of the CaO and CaCO₃ particles.

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