Journal article

Heterogeneous conversion of NO2 and NO on HNO3 treated soot surfaces: atmospheric implications

Kleffmann J, Wiesen P ...see all

Atmos. Chem. Phys., vol. 5, issue 1 (2005) pp. 77-83

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In the present study, the heterogeneous conversion of nitrogen oxide (NO) and nitrogen dioxide (NO2) was studied at atm. humidity levels on flame soot surfaces treated with gaseous nitric acid (HNO3). In addn., the heterogeneous reaction of HNO3 on soot was investigated at atm. humidity. For the treatment of soot by pure HNO3 only reversible uptake with a surface coverage of ∼1-2 × 1014 HNO3 cm-2 was obsd. for HNO3 mixing ratios in the range 250-800 ppbv. Only for higher HNO3 mixing ratios of {>}800 ppbv the formation of NO and NO2 was obsd. The results were not affected by the addn. of NO. In none of the expts. with HNO3 the formation of nitrous acid (HONO) was obsd. For HNO3 mixing ratios {

Author-supplied keywords

  • nitric oxide heterogeneous conversion nitric acid
  • nitrogen oxide heterogeneous conversion nitric aci
  • nitrous oxide formation nitric acid treated soot s

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  • J Kleffmann

  • P Wiesen

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