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Applied Spectroscopy

Applied Spectroscopy

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  • Vol. 42, Iss. 6 — Aug. 1, 1988
  • pp: 945–951

In Situ Fourier Transform Infrared Diffuse Reflectance and Photoacoustic Spectroscopy Characterization of Sulfur-Oxygen Species Resulting from the Reaction of SO2 with CaCO3

Meg Martin Thompson and Richard Alan Palmer

Applied Spectroscopy, Vol. 42, Issue 6, pp. 945-951 (1988)


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Abstract

Fourier transform photoacoustic and diffuse reflectance spectroscopies (FT-IR-PAS and -DRS) have been used in situ to monitor the reaction of SO2 (1.5% in N2) with particulate CaCO3 at temperatures up to 400°C (PAS) and 690°C (DRS). The PA spectra indicate that at 360°C SO2 is physisorbed on the CaCO3 surface. This species is readily desorbed by N2 purging. Under continuous SO2/N2 exposure at 400°C and above, the physisorbed species is shown by the DR data to be converted first to oxygen-bound and then to nonspecifically bound pyramidal SO3 Reaction of the SO3 with SO2 to form SO4 begins at 400°C and is essentially complete at 690°C. The DR data further indicate that for the SO4: (1) at temperatures between 400 and 640°C a monodentate C species forms; (2) above 640°C the SO4 ion has nearly Td symmetry; and (3) upon subsequent cooling, the SO4 exhibits the characteristics of a chelating C species.

Citation
Meg Martin Thompson and Richard Alan Palmer, "In Situ Fourier Transform Infrared Diffuse Reflectance and Photoacoustic Spectroscopy Characterization of Sulfur-Oxygen Species Resulting from the Reaction of SO2 with CaCO3," Appl. Spectrosc. 42, 945-951 (1988)
http://www.opticsinfobase.org/as/abstract.cfm?URI=as-42-6-945


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