Particle growth by acid-catalyzed heterogeneous reactions of organic carbonyls on preexisting aerosols.

摘要: Aerosol growth by the heterogeneous reactions of different aliphatic and α,β-unsaturated carbonyls in presence/absence acidified seed aerosols was studied a 2 m long flow reactor (2.5 cm i.d.) 0.5-m3 Teflon film bag under darkness. For experiments, 2,4-hexadienal, 5-methyl-3-hexen-2-one, 2-cyclohexenone, 3-methyl-2-cyclopentenone, 3-methyl-2-cyclohexenone, octanal were studied. The selected based on their reactivity for acid-catalyzed reactions, proton affinity, similarity to ring-opening products from atmospheric oxidation aromatics. To facilitate hemiacetal/acetal formation, glycerol injected along with inorganic into system. Carbonyl accelerated presence acid catalysts (H2SO4), leading higher aerosol yields than absence. Aldehydes more reactive ketones reactions. conjugated funct...