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Main Title Fourier Transform Infrared Photoacoustic Spectroscopy Characterization of Sulfur-Oxygen Species Resulting from the Reaction of SO2 with CAO and CaCO3.
Author Martin, M. A. ; Childers, J. W. ; Palmer, R. A. ;
CORP Author Duke Univ., Durham, NC. Paul M. Gross Chemical Lab.;Environmental Protection Agency, Research Triangle Park, NC. Air and Energy Engineering Research Lab.
Year Published 1987
Report Number EPA/600/J-87/227;
Stock Number PB88-170683
Additional Subjects Air pollution ; Photometry ; Sulfur dioxide ; Calcium oxides ; Reprints ; Fourier transformation ; Infrared spectroscopy ; Acoustic measurement ; Calcium carbonates ; Stationary sources
Library Call Number Additional Info Location Last
NTIS  PB88-170683 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 9p
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.