Mechanism and Kinetics of Heterogeneous Reactions of Unsaturated Organic Acids on α‐Al2O3 and CaCO3. Issue 21 (8th September 2016)

• Record Type: Journal Article
• Authors: Wu, Lingyan; Liu, Qifan; Tong, Shengrui; Jing, Bo; Wang, Weigang; Guo, Yucong; Ge, Maofa
• Is Part Of: Chemphyschem. Volume 17:Issue 21(2016)
• Page Start: 3515
• Page End: 3523
• Publication Date: 2016-09-08
• Subjects: acrylic acid -- diffuse reflectance infrared Fourier transform spectroscopy -- Knudsen cells -- methacrylic acid -- uptake coefficients; Chemistry, Physical and theoretical -- Periodicals; 541.05
• DOI: 10.1002/cphc.201600668
• Languages: English
• ISSNs: 1439-4235

Abstract

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‐Al2 O3 and CaCO3 are 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‐Al2 O3 and CaCO3 can 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. Abstract : Catch my DRIFTS? The kinetics and mechanism of uptake of two representative atmospheric unsaturated organic acids (acrylic acid and methacrylic acid) on α‐Al2 O3 and CaCO3 particles are investigated using a Knudsen cell reactor and in situ diffuse reflectance infrared Fourier transform spectrometry.