Highly oxygenated organic molecules produced by the oxidation of benzene and toluene in a wide range of OH exposure and NO<sub><i>x</i></sub> conditions

Highly oxygenated organic molecules produced by the oxidation of benzene and toluene in a wide range of OH exposure and NO<sub><i>x</i></sub> conditions

<p>Oxidation of aromatic volatile organic compounds (VOCs) leads to the formation of tropospheric ozone and secondary organic aerosol, for which gaseous oxygenated products are important intermediates. We show, herein, the experimental results of highly oxygenated organic molecules (HOMs) prod...

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Main Authors: X. Cheng, Q. Chen, Y. Jie Li, Y. Zheng, K. Liao, G. Huang
Format: Article
Language:English
Published: Copernicus Publications 2021-08-01
Series:Atmospheric Chemistry and Physics
Online Access:https://acp.copernicus.org/articles/21/12005/2021/acp-21-12005-2021.pdf
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spelling doaj-37255ef3e13d4df0af2a641a1ef198822021-08-11T07:32:52ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242021-08-0121120051201910.5194/acp-21-12005-2021Highly oxygenated organic molecules produced by the oxidation of benzene and toluene in a wide range of OH exposure and NO<sub><i>x</i></sub> conditionsX. Cheng0Q. Chen1Y. Jie Li2Y. Zheng3K. Liao4G. Huang5State Key Joint Laboratory of Environmental Simulation and Pollution Control, BIC-ESAT and IJRC, College of Environmental Sciences and Engineering, Peking University, Beijing, ChinaState Key Joint Laboratory of Environmental Simulation and Pollution Control, BIC-ESAT and IJRC, College of Environmental Sciences and Engineering, Peking University, Beijing, ChinaDepartment of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Taipa, Macau SAR, ChinaState Key Joint Laboratory of Environmental Simulation and Pollution Control, BIC-ESAT and IJRC, College of Environmental Sciences and Engineering, Peking University, Beijing, ChinaState Key Joint Laboratory of Environmental Simulation and Pollution Control, BIC-ESAT and IJRC, College of Environmental Sciences and Engineering, Peking University, Beijing, ChinaState Key Joint Laboratory of Environmental Simulation and Pollution Control, BIC-ESAT and IJRC, College of Environmental Sciences and Engineering, Peking University, Beijing, China<p>Oxidation of aromatic volatile organic compounds (VOCs) leads to the formation of tropospheric ozone and secondary organic aerosol, for which gaseous oxygenated products are important intermediates. We show, herein, the experimental results of highly oxygenated organic molecules (HOMs) produced by the oxidation of benzene and toluene in a wide range of OH exposure and NO<span class="inline-formula"><sub><i>x</i></sub></span> conditions. The results suggest that multigeneration OH oxidation plays an important role in the product distribution, which likely proceeds more preferably via H subtraction than OH addition for early generation products from light aromatics. More oxygenated products present in our study than in previous flow tube studies, highlighting the impact of experimental conditions on product distributions. The formation of dimeric products, however, was suppressed and might be unfavorable under conditions of high OH exposure and low NO<span class="inline-formula"><sub><i>x</i></sub></span> in toluene oxidation. Under high-NO<span class="inline-formula"><sub><i>x</i></sub></span> conditions, nitrogen-containing multifunctional products are formed, while the formation of other HOMs is suppressed. Products containing two nitrogen atoms become more important as the NO<span class="inline-formula"><sub><i>x</i></sub></span> level increases, and the concentrations of these compounds depend significantly on <span class="inline-formula">NO<sub>2</sub></span>. The highly oxygenated nitrogen-containing products might be peroxyacyl nitrates, implying a prolonged effective lifetime of <span class="inline-formula">RO<sub>2</sub></span> that facilitates regional pollution. Our results call for further investigation on the roles of high-<span class="inline-formula">NO<sub>2</sub></span> conditions in the oxidation of aromatic VOCs.</p>https://acp.copernicus.org/articles/21/12005/2021/acp-21-12005-2021.pdf
collection DOAJ
language English
format Article
sources DOAJ
author X. Cheng
Q. Chen
Y. Jie Li
Y. Zheng
K. Liao
G. Huang
spellingShingle X. Cheng
Q. Chen
Y. Jie Li
Y. Zheng
K. Liao
G. Huang
Highly oxygenated organic molecules produced by the oxidation of benzene and toluene in a wide range of OH exposure and NO<sub><i>x</i></sub> conditions
Atmospheric Chemistry and Physics
author_facet X. Cheng
Q. Chen
Y. Jie Li
Y. Zheng
K. Liao
G. Huang
author_sort X. Cheng
title Highly oxygenated organic molecules produced by the oxidation of benzene and toluene in a wide range of OH exposure and NO<sub><i>x</i></sub> conditions
title_short Highly oxygenated organic molecules produced by the oxidation of benzene and toluene in a wide range of OH exposure and NO<sub><i>x</i></sub> conditions
title_full Highly oxygenated organic molecules produced by the oxidation of benzene and toluene in a wide range of OH exposure and NO<sub><i>x</i></sub> conditions
title_fullStr Highly oxygenated organic molecules produced by the oxidation of benzene and toluene in a wide range of OH exposure and NO<sub><i>x</i></sub> conditions
title_full_unstemmed Highly oxygenated organic molecules produced by the oxidation of benzene and toluene in a wide range of OH exposure and NO<sub><i>x</i></sub> conditions
title_sort highly oxygenated organic molecules produced by the oxidation of benzene and toluene in a wide range of oh exposure and no<sub><i>x</i></sub> conditions
publisher Copernicus Publications
series Atmospheric Chemistry and Physics
issn 1680-7316
1680-7324
publishDate 2021-08-01
description <p>Oxidation of aromatic volatile organic compounds (VOCs) leads to the formation of tropospheric ozone and secondary organic aerosol, for which gaseous oxygenated products are important intermediates. We show, herein, the experimental results of highly oxygenated organic molecules (HOMs) produced by the oxidation of benzene and toluene in a wide range of OH exposure and NO<span class="inline-formula"><sub><i>x</i></sub></span> conditions. The results suggest that multigeneration OH oxidation plays an important role in the product distribution, which likely proceeds more preferably via H subtraction than OH addition for early generation products from light aromatics. More oxygenated products present in our study than in previous flow tube studies, highlighting the impact of experimental conditions on product distributions. The formation of dimeric products, however, was suppressed and might be unfavorable under conditions of high OH exposure and low NO<span class="inline-formula"><sub><i>x</i></sub></span> in toluene oxidation. Under high-NO<span class="inline-formula"><sub><i>x</i></sub></span> conditions, nitrogen-containing multifunctional products are formed, while the formation of other HOMs is suppressed. Products containing two nitrogen atoms become more important as the NO<span class="inline-formula"><sub><i>x</i></sub></span> level increases, and the concentrations of these compounds depend significantly on <span class="inline-formula">NO<sub>2</sub></span>. The highly oxygenated nitrogen-containing products might be peroxyacyl nitrates, implying a prolonged effective lifetime of <span class="inline-formula">RO<sub>2</sub></span> that facilitates regional pollution. Our results call for further investigation on the roles of high-<span class="inline-formula">NO<sub>2</sub></span> conditions in the oxidation of aromatic VOCs.</p>
url https://acp.copernicus.org/articles/21/12005/2021/acp-21-12005-2021.pdf
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