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DEVELOPMENT OF INFRARED METHODS FOR CHARACTERIZATION OF INORGANIC SULFUR SPECIES RELATED TO INJECTION DESULFURIZATION PROCESSES
Citation:
Thompson, M. AND R. Palmer. DEVELOPMENT OF INFRARED METHODS FOR CHARACTERIZATION OF INORGANIC SULFUR SPECIES RELATED TO INJECTION DESULFURIZATION PROCESSES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/7-90/012.
Description:
The report gives results of using photoacoutsic (PA) and diffuse reflectance (DR) detection methods in Fourier transform infrared spectroscopy (FTIRS) to evaluate the reactions of particulate CaO, CaCO3, and Ca(OH)2 samples with S02 at temperatures of 25-900 C. he work involved three types of studies: ost-exposure FTIR-PAS (25-900 C), in situ FTIR-DRS (25-700 C), and in situ FTIR-PAS (25-400 G). ost-exposure FTIR-PAS experiments involved obtaining spectral measurements of particulate CaO, CaCO3, and Ca(OH)2 samples after they had been exposed to 1.5% SO2 in He as a function of exposure time, temperature, and gas composition. hese data indicate that: he initial product formed is CaSO3; at temperatures above 500 C, CaSO3 is converted to CaSO4; the formation of CaSO4 is not as extensive for exposures of 900 C as it is at 750 C; in the presence of O2, the production of CaSO3 is reduced; and the extent of SO2 capture by the reactants decreases in the order Ca(OH)2> CaCO3> CaO. In situ FTIR-DRS experiments confirmed post-exposure FTlR-PAS results. TlR-DRS also indicated that the formation of S2O3(--) depends on the concentration of CaO, CaCO3, or Ca(OH)2 in the NaCl diluent. wo SO3(--) species and an intermediate monodentate SO4(--) species were also detected and identified.