Reactive uptake of HONO on aluminium oxide surface
Romanias, MN; El Zein, A; Bedjanian, Y
| HERO ID | 1565062 |
|---|---|
| In Press | No |
| Year | 2012 |
| Title | Reactive uptake of HONO on aluminium oxide surface |
| Authors | Romanias, MN; El Zein, A; Bedjanian, Y |
| Journal | Journal of Photochemistry and Photobiology A: Chemistry |
| Volume | 250 |
| Page Numbers | 50-57 |
| Abstract | Kinetics and products of the interaction of HONO with solid films of Al2O3 were investigated under dark and UV irradiation conditions using a low pressure flow reactor (1-10 Torr) combined with a modulated molecular beam mass spectrometer for monitoring of the gaseous species involved. The reactive uptake of HONO to Al2O3 was studied as a function of HONO concentration ([HONO](0)=(0.6-3.5) x 10(12) molecule cm(-3)), relative humidity (RH=1.4 x 10(-4) to 35.4%), temperature (T=275-320 K) and UV irradiation intensity (J(NO2)=0.002-0.012s(-1)). The measured reactive uptake coefficient was independent of the HONO concentration and temperature. In contrast, the relative humidity (RH) was found to have a strong impact on the uptake coefficient: gamma=4.8 x 10(-6) (RH)(-6.61) and gamma=1.7 x 10(-5) (RH)(-0.44) under dark conditions and on irradiated surface (J(NO2)=0.012 s(-1)), respectively (gamma calculated with BET surface area, 30% conservative uncertainty). NO2 and NO were observed as products of the HONO reaction with Al2O3 surface with yields of 40 +/- 6 and 60 +/- 9%, respectively, independent of relative humidity, temperature, concentration of HONO and UV irradiation intensity under experimental conditions used. The HONO uptake on mineral aerosol (calculated with uptake data for HONO on Al2O3 surface) appears to be of minor importance compared with other HONO loss processes in the boundary layer of the earth atmosphere. (C) 2012 Elsevier B.V. All rights reserved. |
| Doi | 10.1016/j.jphotochem.2012.09.018 |
| Wosid | WOS:000312524700007 |
| Is Certified Translation | No |
| Dupe Override | No |
| Comments | Source: Web of Science WOS:000312524700007 |
| Is Public | Yes |
| Keyword | Al2O3; HONO; UV irradiation; Heterogeneous reaction; Uptake coefficient; Products |