Hydrolysis of N2O5 on submicron sulfuric acid aerosols

Hallquist, M., Stewart, D. J., Baker, J. and Cox, R.A. (2000) Hydrolysis of N2O5 on submicron sulfuric acid aerosols. Journal of Physical Chemistry A, 104 (17). pp. 3984-3990. ISSN 1520-5215 doi: 10.1021/jp9939625

Abstract/Summary

The kinetics of reactive uptake of gaseous N2O5 on submicron sulfuric acid aerosol particles has been investigated using a laminar flow reactor coupled with a differential mobility analyzer (DMA) to characterize the aerosol. The particles were generated by homogeneous nucleation of SO3/H2O mixtures. In the H2SO4 concentration range 26.3−64.5 wt % the uptake coefficient was γ = 0.033 ± 0.004, independent of acid strength. For an acid strength of 45 wt % γ was found to decrease with increasing temperature over the range 263−298 K. From this, temperature dependence values of −115 ± 30 kJ/mol and −25.5 ± 8.4 J/K mol were determined for the changes in enthalpy and entropy of the uptake process, respectively. The results are consistent with a previous model of N2O5 hydrolysis involving both a direct and an acid catalyzed mechanism, with uptake under the experimental conditions limited by mass accommodation.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/5978
Item Type	Article
Refereed	Yes
Divisions	No Reading authors. Back catalogue items
Publisher	American Chemical Society
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