DOI: 10.1016/j.atmosenv.2020.117560
论文题名: The influence of SO2 as the Criegee intermediate scavenger on the heterogeneous oxidation of oleic acid
作者: Yang M. ; Ma S.-S. ; Ashraf H. ; Pang S.-F. ; Zhang Y.-H.
刊名: Atmospheric Environment
ISSN: 1352-2310
出版年: 2020
卷: 231 语种: 英语
英文关键词: Atmospheric humidity
; Esters
; Flow of gases
; Fourier transform infrared spectroscopy
; Gases
; Oleic acid
; Ozone
; Reaction rates
; Sulfur compounds
; Unsaturated fatty acids
; Atmospheric implications
; Criegee intermediates
; Fourier transform infra reds
; Gas flow systems
; Heterogeneous oxidation
; Heterogeneous reactions
; Sulfate aerosols
; Sulfate production
; Reaction intermediates
; ester
; oleic acid
; ozone
; scavenger
; sulfate
; sulfuric acid
; atmospheric chemistry
; chemical compound
; ester
; inhibition
; oxidation
; scavenging (chemistry)
; sulfur dioxide
; sulfuric acid
; Article
; comparative study
; concentration (parameter)
; controlled study
; esterification
; Fourier transform infrared spectroscopy
; gas
; oxidation
; ozonolysis
; polymerization
; priority journal
; troposphere
学科: Condensed-phase CIs
; Heterogeneous oxidation
; Inhibition
; Oleic acid
; SO2
中文摘要: As a well-known Criegee intermediate (CI) scavenger, SO2 can react with CIs in the gas phase to form sulphuric acid, which can be further converted to sulfate aerosols, which make an important contribution to haze formation. Despite the potential importance, the interaction of SO2 with the CIs produced by heterogeneous oxidation of unsaturated fatty acids remains largely unclear. In this work, the heterogeneous reactions of oleic acid (OA) thin films with O3 and O3/SO2 mixture gases are studied under four different relative humidities (RHs): 5%, 30%, 60% and 80%, using microscopic Fourier transform infrared (micro-FTIR) spectrometer combined with a gas-flow system. A detailed comparison on formation rates of ester and intensity ratios of 1742 cm−1 band (envelope C[dbnd]O of ester) to 1712 cm−1 band (feature C[dbnd]O of carboxyl) between the two reaction systems shows that the addition of SO2 inhibits the conversion of carboxyl to ester at any RH. As the SO2 concentration increases, the formation rates and final relative amount of ester decrease. Based on these data, it can be concluded that SO2 consumes part condensed-phase CIs produced by ozonolysis of OA, resulting in a significant inhibition in ester formation. The present results provide an important atmospheric implication on the reaction between SO2 and condensed-phase CIs, which may be a missing sulfate production pathway in the atmosphere. © 2020 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160768
Appears in Collections: 气候变化与战略
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作者单位: The Institute of Chemical Physics, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, China
Recommended Citation:
Yang M.,Ma S.-S.,Ashraf H.,et al. The influence of SO2 as the Criegee intermediate scavenger on the heterogeneous oxidation of oleic acid[J]. Atmospheric Environment,2020-01-01,231