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FOURIER TRANSFORM INFRARED PHOTOACOUSTIC SPECTROSCOPY CHARACTERIZATION OF SULFUR-OXYGEN SPECIES RESULTING FROM THE REACTION OF SO2 WITH CAO AND CACO3
Citation:
Martin, M., J. Childers, AND R. Palmer. FOURIER TRANSFORM INFRARED PHOTOACOUSTIC SPECTROSCOPY CHARACTERIZATION OF SULFUR-OXYGEN SPECIES RESULTING FROM THE REACTION OF SO2 WITH CAO AND CACO3. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-87/227 (NTIS PB88170683), 1987.
Description:
Fourier transform infrared photoacoustic spectroscopy (FTIR-PAS) has been used to investigate the reaction of SO2 in He with CaO and CaCO3 particles at temperatures between 25 and 900 C. SO2 reacts with CaC at 25 C, while the reaction of Ca-CO3 with SO2 is first evident at 550 C (the initial product of both 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 due to 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.