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
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To link to this article DOI: 10.1021/jp9939625
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.