A method for the estimation of the reaction probability of the heterogeneous N2O5+H2O → 2HNO3 reaction using the deposition profile in a laminar flow tube, in which the walls are coated with the condensed aqueous phase of interest, is presented. The production of gas phase nitric acid on the surface followed by its absorption complicates the deposition profiles and hence the calculation of the reaction probability. An estimation of the branching ratio for this process enables a more appropriate calculation to be carried out. Reaction probabilities of N2O5 on substances including some normally constituting atmospheric aerosols, NaCl, NH4HSO4, as well as Na2CO3 are estimated and found to depend on relative humidity and characteristics of the coating used. These fell within the range (0.04–2.0)×10−2.
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Msibi, I.M., Li, Y., Shi, J.P. et al. Determination of heterogeneous reaction probability using deposition profile measurement in an annular reactor: Application to the N2O5/H2O reaction. J Atmos Chem 18, 291–300 (1994). https://doi.org/10.1007/BF00696784
- Heterogeneous reaction
- annular reactor
- reaction probability