Formation of highly oxygenated organic molecules from aromatic compounds

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Molteni , U , Bianchi , F , Klein , F , El Haddad , I , Frege , C , Rossi , M J , Dommen , J & Baltensperger , U 2018 , ' Formation of highly oxygenated organic molecules from aromatic compounds ' , Atmospheric Chemistry and Physics , vol. 18 , no. 3 , pp. 1909-1921 . https://doi.org/10.5194/acp-18-1909-2018

Title: Formation of highly oxygenated organic molecules from aromatic compounds
Author: Molteni, Ugo; Bianchi, Federico; Klein, Felix; El Haddad, Imad; Frege, Carla; Rossi, Michel J.; Dommen, Josef; Baltensperger, Urs
Contributor: University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
Date: 2018-02-09
Language: eng
Number of pages: 13
Belongs to series: Atmospheric Chemistry and Physics
ISSN: 1680-7316
URI: http://hdl.handle.net/10138/239801
Abstract: Anthropogenic volatile organic compounds (AV-OCs) often dominate the urban atmosphere and consist to a large degree of aromatic hydrocarbons (ArHCs), such as benzene, toluene, xylenes, and trimethylbenzenes, e.g., from the handling and combustion of fuels. These compounds are important precursors for the formation of secondary organic aerosol. Here we show that the oxidation of aromatics with OH leads to a subsequent autoxidation chain reaction forming highly oxygenated molecules (HOMs) with an O:C ratio of up to 1.09. This is exemplified for five single-ring ArHCs (benzene, toluene, o-/m-/p-xylene, mesitylene (1,3,5-trimethylbenzene) and ethylbenzene), as well as two conjugated polycyclic ArHCs (naphthalene and biphenyl). We report the elemental composition of the HOMs and show the differences in the oxidation patterns of these ArHCs. A potential pathway for the formation of these HOMs from aromatics is presented and discussed. We hypothesize that AV-OCs may contribute substantially to new particle formation events that have been detected in urban areas.
Subject: 114 Physical sciences
OXIDIZED RO2 RADICALS
ULTRAVIOLET EXCIMER RADIATION
PARTICLE FORMATION
PEROXY-RADICALS
OZONOLYSIS PRODUCTS
ALPHA-PINENE
GAS-PHASE
MULTIFUNCTIONAL PRODUCTS
ATMOSPHERIC CHEMISTRY
CHEMICAL-IONIZATION
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