Gas-phase reaction of N2O5 with water vapor: Importance of heterogeneous hydrolysis of N2O5 and surface desorption of HNO3 in a large teflon chamber

Details Gas-phase reaction of N2O5 with water vapor: Importance of heterogeneous hydrolysis of N2O5 and surface desorption of HNO3 in a large teflon chamber Gas-phase reaction of N2O5 with water vapor: Importance of heterogeneous hydrolysis of N2O5 and surface desorption of HNO3 in a large teflon chamber

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.2169w&link_type=abstract

Geophysical Research Letters, Volume 25, Issue 12, p. 2169-2172

Physics

25

Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties, Atmospheric Composition And Structure: Troposphere-Composition And Chemistry, Atmospheric Composition And Structure: Instruments And Techniques

Scientific paper

Laboratory measurements of the gas-phase hydrolysis of N2O5 are always preturbed by wall reactions. Their contribution could be quantified in a large double-walled teflon bag chamber by introducing HNO3 into the chamber and analysing its temporal evolution in the gas-phase at low and high relative humidities, and by varying the surface-to-volume ratio of the chamber. By fitting a model to the experimental results, a consistent set of rate coefficients for adsorption and desorption of HNO3 from the chamber walls could be obtained. The desorption is so slow that the gas-phase hydrolysis of N2O5 via the reactions N2O5+H2O->2HNO3 (k1=2.5.10-22cm3molec.-1s-1) and N2O5+2H2O->2HNO3+H2O (k2=1.8.10-39cm6molec.-2s-1) is influenced by wall effects to less than 5%. The importance of the gas-phase N2O5 hydrolysis in the troposphere is discussed.

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