Section 7
Chapter 6,542

Sulfur di oxide oxidation over atmospheric aerosol x ray photo electron spectra of sulfur di oxide adsorbed on vanadium hemi pent oxide and carbon

Barbaray, B.; Contour, J.P.; Mouvier, G.

Atmospheric Environment 11(4): 351-356


ISSN/ISBN: 0004-6981
Accession: 006541181

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Adsorption and oxidation of SO2 over V2O5 and C are studied by X-ray Photoelectron Spectroscopy (XPS). SO2 does not chemisorb onto V2O5 below 150.degree. C, and it oxidizes at 200.degree. C into adsorbed sulfate and SO3. Over C, chemisorption and oxidation occur from room temperature upwards, but at 200.degree. C reduction of SO2 by C takes place, giving elementary S and CS2. The V2O5 aerosols apparently contribute little to the production of atmospheric sulfuric acid below 150.degree. C, whereas C particles can catalyze SO2 oxidation even at low temperatures, and produce secondary absorbed pollutants such as elementary S and CS2 at higher temperatures.

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