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
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.