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Experimental Investigations of the Interaction of SO2 with MgO

Published online by Cambridge University Press:  10 February 2011

Andrea Freitag ,
J. A. Rodriguez  and
J. Z. Larese
Andrea Freitag
Affiliation:
Chemistry Department, Brookhaven National Laboratory, Upton, NY 11973-5000
J. A. Rodriguez
Affiliation:
Chemistry Department, Brookhaven National Laboratory, Upton, NY 11973-5000
J. Z. Larese
Affiliation:
Chemistry Department, Brookhaven National Laboratory, Upton, NY 11973-5000
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Abstract

High resolution adsorption isotherms, temperature programmed desorption (TPD), x-ray diffraction (XRD) and x-ray absorption near edge spectroscopy (XANES) methods were used to investigate the interaction of SO2 with high quality MgO powders. The results of these investigations indicate that when SO2 is deposited on MgO in monolayer quantities at temperatures near 100K both SO3 and SO4 species form that are not removed by simply pumping on the pre-dosed samples at room temperature. TPD and XANES studies indicate that heating of pre-dosed MgO samples to temperatures above 350 °C is required for full removal of the SO3/SO4 species. XANES measurements made as a function of film thickness indicate for coverages near monolayer completion that the SO4 species form first.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 590: Symposium R – Applications of Synchrotron Radiation Techniques…V , 1999 , 189
Copyright
Copyright © Materials Research Society 2000

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References

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