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| Titel |
Catalysis and Ionic Transformations of Organic Compounds in Atmospheric Aerosols: a Decade of Discoveries |
| VerfasserIn |
B. Nozière, P. Dziedzic, A. Córdova |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250021665
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| Zusammenfassung |
| While radical reactions were though for a long time to be the main fate of organic compounds
in atmospheric aerosols, a number of catalysts making ionic reactions of these compounds
efficient in aerosols have been identified in the last decade: strong acids,1,2 amino acids,3,4
and, more recently, inorganic salts.5,6 Unlike radical oxidations, ionic reactions such as aldol
condensation or acetal formation have the peculiarity to form new C-C, C-O, or C-N bonds.
They can thus produce oligomers that can not be formed by radical processes and might play
important roles on the optical properties of the aerosols,3,7 or the formation of
secondary organic aerosols (SOA) in the case of specific carbonyl compounds such as
glyoxal.5,8
This presentation proposes an overview of this first decade of findings. The efficiency and
atmospheric relevance of the different catalysts will be compared in term of kinetics. Current
estimates of the contribution of these reactions to the optical properties of aerosols, the uptake
of organic gases, and the formation of SOA will be proposed based on the latest laboratory
results and field observations.
References
1Duncan, J. L., L. R. Schindler, J. T. Roberts, Geophys. Res. Lett., 25, 631,
1998.
2Jang,M., N. M. Czoschke, S. Lee, R. M. Kamens, Science, 298, 814, 2002.
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