Abstract
This report presents a study on the reduction of NO2 (nitrogen dioxide) to HONO (nitrous
acid) by two atmospherically significant volatile organic compounds, glycolaldehyde (Gla)
and hydroxyacetone (HAc) in the gas phase under simulated tropospheric condition. The
FTIR spectroscopic probing clearly reveals that HONO is the predominant product of the
reactions. It is demonstrated that the reactions occur in 2:1 stoichiometry with respect to NO2
and Gla/HAc, and from a thermochemical viewpoint, the reactions are energetically
favorable. In each case the overall reaction occurs as a 3rd order process, and the
corresponding rate constants are (1.46±0.04) ×10-34 cm6 molecule-2 s
-1 and (2.06±0.06) ×10-35
cm
6 molecule-2
s
-1 for the reaction of NO2 with Gla and HAc respectively. A brief discussion
is also presented about the atmospheric implications of the findings.
Supplementary materials
Title
NO2 reduction to HONO by small α-hydroxycarbonyls: a laboratory investigation in relevance to nighttime production of atmospheric HONO
Description
Supplementary information includes 2 Figures and 4 pages
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