Biomass combustion releases lignin pyrolysis products � many of which are 2-methoxyphenols with various side chains in the 4-position � into the atmosphere, where they likely contribute to the organic composition of troposperic aerosols. To model this chemistry, we investigated the adsorption of gaseous eugenol and 2-methoxy-4-propylphenol on NaCl and Al2O3, which serve as surrogates for sea salt and mineral aerosols, respectively. Organic coatings approached monolayer coverage for NaCl and KI under dry conditions (i.e., RH < 2%) but exhibited lower surface coverage upon co-adsorption of water at higher humidity. Both methoxylphenols dissociatively adsorbed on Al2O3 at near-monolayer levels at all RH levels studied (2�70% RH). Exposing surface adsorbed methoxyphenols to 400 ppb ozone resulted in efficient oxidation initiated by 1,3-cycloaddition at both the alkene side chain and the aromatic ring, and the relative rates for eugenol versus 2-methoxy-4-propylphenol allowed for quantitative comparison of addition at these two distinct sites.

Heterogeneous ozonolysis of surface adsorbed eugenol and 2-methoxy-4propylphenol

244th National Meeting (2012)

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