Laboratory studies of the impact of aerosol composition on the heterogeneous oxidation of 1-propanol

Sewon Oh, Jean M. Andino

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The effects of (NH4)2SO4, NH4NO3, NaCl, NH4Cl, and Na2SO4 aerosols on the kinetics of 1-propanol oxidation in the presence of the hydroxyl radical have been investigated using the relative rate technique. p-Xylene was used as a reference compound. Two different aerosol concentrations that are typical of polluted urban conditions were tested. The total surface areas of aerosols were 1400 (condition I) and 3400μm2cm-3 (condition II). Results indicate that aerosols promote the oxidation of 1-propanol, and the extents of the promoting effects depend on the aerosol composition and concentration. Increases in the relative rates of the 1-propanol/·OH reaction vs. the p-xylene/·OH reaction were only observed for (NH4)2SO4 aerosol conditions I and II, NH4NO3 aerosol condition II, and NH4Cl aerosol condition II. These results indicate that NH4+ is the species promoting the oxidation of 1-propanol, and suggests the possibility of a strong interaction between NH4+ and 1-propanol that can change the activation energy of the initial ·OH attack. These results have profound implications on the use of air quality models for the assessment of air pollution control strategies.

Original languageEnglish
Pages (from-to)149-156
Number of pages8
JournalAtmospheric Environment
Volume36
Issue number1
DOIs
Publication statusPublished - 2002

Keywords

  • 1-Propanol
  • OH radical reaction
  • Ozone
  • p-xylene
  • Relative rate

ASJC Scopus subject areas

  • Atmospheric Science
  • Environmental Science(all)
  • Pollution

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