Kinetics and Products of Heterogeneous Reaction of HONO with Fe2O3 and Arizona Test Dust - Archive ouverte HAL Access content directly
Journal Articles Environmental Science and Technology Year : 2013

Kinetics and Products of Heterogeneous Reaction of HONO with Fe2O3 and Arizona Test Dust

(1) , (1) , (1)
1

Abstract

Kinetics and products of the reaction of HONO with solid films of Fe2O3 and Arizona Test Dust (ATD) were investigated using a low pressure flow reactor (1 – 10 Torr) combined with a modulated molecular beam mass spectrometer. The reactive uptake of HONO was studied as a function of HONO concentration ([HONO]0 = (0.6 – 15.0) × 1012 molecules cm–3), relative humidity (RH = 3 × 10–4 – 84.1%) and temperature (T = 275 – 320 K). Initial reactive uptake coefficients were found to be similar under dark conditions and in the presence of UV irradiation (JNO2 = 0.012 s–1) and independent of the HONO concentration and temperature. In contrast, the relative humidity (RH) was found to have a strong impact on the uptake coefficients: γ (ATD) = 3.8 × 10–6 (RH)−0.61 and γ (Fe2O3) = 1.7 × 10–6 (RH)−0.62 (γ calculated with BET surface area, 30% conservative uncertainty). In both reactions of HONO studied, NO2 and NO were observed as gaseous products with yields of (60 ± 9) and (40 ± 6) %, respectively, independent of relative humidity, temperature, concentration of HONO and UV irradiation intensity. The observed data point to minor importance of the HONO uptake on mineral aerosol compared with other known sinks of HONO in the atmosphere, which are its dry deposition and photolysis in night-time and during the day, respectively.
Not file

Dates and versions

insu-01334820 , version 1 (21-06-2016)

Identifiers

Cite

Atallah El Zein, Manolis N. Romanias, Yuri Bedjanian. Kinetics and Products of Heterogeneous Reaction of HONO with Fe2O3 and Arizona Test Dust. Environmental Science and Technology, 2013, 47 (12), pp.6325-6331. ⟨10.1021/es400794c⟩. ⟨insu-01334820⟩
20 View
0 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More