Enhanced Sulfate Formation on Ozone-Exposed Soot
2011 (English)In: Journal of Aerosol Science, ISSN 0021-8502, E-ISSN 1879-1964, Vol. 42, no 9, 615-620 p.Article in journal (Refereed) Published
Gas phase experiments were conducted to examine the heterogeneous oxidation of sulfur dioxide on methane soot in the presence of ozone and water vapor. The enhanced formation of sulfate at atmospheric pressure was confirmed by the use of a particle-into-liquid sampler (PILS) coupled with ion chromatography (IC). Due to the ozone oxidation, multilayer adsorption of sulfur dioxide on soot, as well as sulfate formation and physisorption on secondary surface layer sites were observed. The exposure also caused the soot to become hydrophilic, due to the formation of sulfuric acid and also likely the formation of carboxyl groups on the surface. The sulfate yield increased with ozone levels, but no increase was observed at ozone concentrations above 1000 ppm.
Place, publisher, year, edition, pages
2011. Vol. 42, no 9, 615-620 p.
Sulfate, Aerosol, Ozone, Soot, Chemisorption, XPS
Meteorology and Atmospheric Sciences
IdentifiersURN: urn:nbn:se:kth:diva-26124DOI: 10.1016/j.jaerosci.2011.04.004ISI: 000295148000005ScopusID: 2-s2.0-79960317269OAI: oai:DiVA.org:kth-26124DiVA: diva2:370245
QC 20101116. Updated from submitted to published (20111017)2010-11-162010-11-162011-10-17Bibliographically approved