NO2 reduction to HONO by small α-hydroxycarbonyls: a laboratory investigation in relevance to nighttime production of atmospheric HONO

11 December 2024, Version 1
This content is a preprint and has not undergone peer review at the time of posting.

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
Description
Actions
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
Actions

Comments

Comments are not moderated before they are posted, but they can be removed by the site moderators if they are found to be in contravention of our Commenting Policy [opens in a new tab] - please read this policy before you post. Comments should be used for scholarly discussion of the content in question. You can find more information about how to use the commenting feature here [opens in a new tab] .
This site is protected by reCAPTCHA and the Google Privacy Policy [opens in a new tab] and Terms of Service [opens in a new tab] apply.