title: Mechanism and Kinetics of Heterogeneous Reactions of Unsaturated Organic Acids on α-Al2O3and CaCO3.
abstract: Heterogeneous reactions have a vital role in the atmosphere due to their significant effects on the evolution of atmospheric aerosols, which in turn contribute to air pollution. However, the mechanism and kinetics of these processes involving unsaturated organic acids, important types of volatile organic compounds, are still unclear. In this work, the heterogeneous uptake of two representative atmospheric unsaturated organic acids (acrylic acid and methacrylic acid) on mineral aerosols including α-Al2O3and CaCO3are investigated using a Knudsen cell reactor and an in situ diffuse reflectance infrared Fourier transform spectrometry (DRIFTS) reactor. The corresponding reaction pathways are proposed from the DRIFTS analysis. In addition, the initial uptake coefficients of unsaturated organic acids and their heterogeneous fate are obtained for the first time. Our results suggest that heterogeneous reactions on α-Al2O3and CaCO3can be important sinks for acrylic acid and methacrylic acid, as well as possible contributors to the organic coating found on atmospheric aerosols, especially in high-pollution events.
authors: State Key Laboratory of Severe Weather and Key Laboratory of Atmospheric Chemistry of CMA, Chinese Academy of Meteorological Sciences, Beijing, 100081, P.R. China.
authors: Lingyan
authors: L
authors: Wu
authors: Beijing National Laboratory for Molecular Science (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.|University of Chinese Academy of Sciences, Beijing, 100049, P.R.China.
authors: Qifan
authors: Q
authors: Liu
authors: Beijing National Laboratory for Molecular Science (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
authors: Shengrui
authors: S
authors: Tong
authors: Beijing National Laboratory for Molecular Science (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
authors: Bo
authors: B
authors: Jing
authors: Beijing National Laboratory for Molecular Science (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
authors: Weigang
authors: W
authors: Wang
authors: Beijing National Laboratory for Molecular Science (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
authors: Yucong
authors: Y
authors: Guo
authors: Beijing National Laboratory for Molecular Science (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.|University of Chinese Academy of Sciences, Beijing, 100049, P.R.China.|CAS Center for Excellence in Urban Atmospheric Environment (CEUAE), Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, P. R. China.
authors: Maofa
authors: M
authors: Ge
keywords: Knudsen cells; acrylic acid; diffuse reflectance infrared Fourier transform spectroscopy; methacrylic acid; uptake coefficients