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Carbenium ion-mediated oligomerization of methylglyoxal for secondary organic aerosol formation

Ji, Yuemeng and Shi, Qiuju and Li, Yixin and An, Taicheng and Zheng, Jun and Peng, Jianfei and Gao, Yanpeng and Chen, Jiangyao and Li, Guiying and Wang, Yuan and Zhang, Fang and Zhang, Annie L. and Zhao, Jiayun and Molina, Mario J. and Zhang, Renyi (2020) Carbenium ion-mediated oligomerization of methylglyoxal for secondary organic aerosol formation. Proceedings of the National Academy of Sciences of the United States of America, 117 (24). pp. 13294-13299. ISSN 0027-8424. PMCID PMC7306812. https://resolver.caltech.edu/CaltechAUTHORS:20200605-102205074

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Abstract

Secondary organic aerosol (SOA) represents a major constituent of tropospheric fine particulate matter, with profound implications for human health and climate. However, the chemical mechanisms leading to SOA formation remain uncertain, and atmospheric models consistently underpredict the global SOA budget. Small α-dicarbonyls, such as methylglyoxal, are ubiquitous in the atmosphere because of their significant production from photooxidation of aromatic hydrocarbons from traffic and industrial sources as well as from biogenic isoprene. Current experimental and theoretical results on the roles of methylglyoxal in SOA formation are conflicting. Using quantum chemical calculations, we show cationic oligomerization of methylglyoxal in aqueous media. Initial protonation and hydration of methylglyoxal lead to formation of diols/tetrol, and subsequent protonation and dehydration of diols/tetrol yield carbenium ions, which represent the key intermediates for formation and propagation of oligomerization. On the other hand, our results reveal that the previously proposed oligomerization via hydration for methylglyoxal is kinetically and thermodynamically implausible. The carbenium ion-mediated mechanism occurs barrierlessly on weakly acidic aerosols and cloud/fog droplets and likely provides a key pathway for SOA formation from biogenic and anthropogenic emissions.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1073/pnas.1912235117DOIArticle
https://www.pnas.org/content/suppl/2020/06/03/1912235117.DCSupplementalPublisherSupporting Information
http://www.ncbi.nlm.nih.gov/pmc/articles/pmc7306812/PubMed CentralArticle
ORCID:
AuthorORCID
Ji, Yuemeng0000-0002-8641-4276
Li, Yixin0000-0001-7937-7385
An, Taicheng0000-0001-6918-8070
Zheng, Jun0000-0001-6225-6130
Peng, Jianfei0000-0003-4753-087X
Li, Guiying0000-0002-6777-4786
Wang, Yuan0000-0001-6657-8401
Molina, Mario J.0000-0003-2339-3225
Zhang, Renyi0000-0001-8708-3862
Additional Information:© 2020 the Author(s). Published by PNAS. This open access article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND). Contributed by Mario J. Molina, April 10, 2020 (sent for review July 16, 2019; reviewed by Yiqin Gao and Keith Kuwata). PNAS first published June 3, 2020. This work was supported by National Natural Science Foundation of China Grants (41731279 and 41675122); Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01Z032); Natural Science Foundation of Guangdong Province, China (2019B151502064); Science and Technology Program of Guangzhou City (201707010188); a collaborative research program between Texas A&M University and the National Natural Science Foundation of China; Innovation Team Project of Guangdong Provincial Department of Education (2017KCXTD012); Science and Technology Key Project of Guangdong Province, China (2019B110206002); and the Robert A. Welch Foundation Grant (A-1417). Additional support for this research was provided by the Texas A&M University Supercomputing Facilities. We acknowledge the use of the Laboratory for Molecular Simulations at Texas A&M University. A.L.Z. was supported by a fellowship from the Robert A. Welch Foundation. Data Availability: All data relevant to this research are available in the main text and SI Appendix. Y.J. and Y.L. contributed equally to this work. Author contributions: Y.J. and R.Z. designed research; Y.J., Q.S., Y.L., T.A., Y.W., J. Zhao, M.J.M., and R.Z. performed research; Y.J., Y.L., T.A., J. Zheng, J.P., Y.G., J.C., G.L., F.Z., J. Zhao, M.J.M., and R.Z. analyzed data; and Y.J., A.L.Z., and R.Z. wrote the paper. Reviewers: Y.G., Peking University; and K.K., Macalester College. The authors declare no competing interest. This article contains supporting information online at https://www.pnas.org/lookup/suppl/doi:10.1073/pnas.1912235117/-/DCSupplemental.
Funders:
Funding AgencyGrant Number
National Natural Science Foundation of China41731279
National Natural Science Foundation of China41675122
Guangdong Pearl River Talents Program2017BT01Z032
Natural Science Foundation of Guangdong Province2019B151502064
Science and Technology Program of Guangzhou City201707010188
Texas A&M UniversityUNSPECIFIED
Guangdong Provincial Department of Education2017KCXTD012
Science and Technology Key Project of Guangdong Province2019B110206002
Robert A. Welch FoundationA-1417
Subject Keywords:econdary organic aerosol; aqueous; oligomerization; brown carbon; cationic
Issue or Number:24
PubMed Central ID:PMC7306812
Record Number:CaltechAUTHORS:20200605-102205074
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200605-102205074
Official Citation:Carbenium ion-mediated oligomerization of methylglyoxal for secondary organic aerosol formation Yuemeng Ji, Qiuju Shi, Yixin Li, Taicheng An, Jun Zheng, Jianfei Peng, Yanpeng Gao, Jiangyao Chen, Guiying Li, Yuan Wang, Fang Zhang, Annie L. Zhang, Jiayun Zhao, Mario J. Molina, Renyi Zhang Proceedings of the National Academy of Sciences Jun 2020, 117 (24) 13294-13299; DOI: 10.1073/pnas.1912235117
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103731
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:05 Jun 2020 17:43
Last Modified:06 Jul 2020 20:39

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