DOI: 10.1016/j.atmosenv.2017.04.028
Scopus记录号: 2-s2.0-85018264928
论文题名: Reactions of lactones with tropospheric oxidants: A kinetics and products study
作者: Walavalkar M ; P ; , Sharma A ; , Dhanya S ; , Naik P ; D
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 161 起始页码: 18
结束页码: 26
语种: 英语
英文关键词: Alpha-methyl-gamma-butyrolactone (AMGBL)
; Cl atom reaction
; Gamma-valerolactone(GVL)
; OH radical reaction
; Oxidation products
; Rate coefficient
; Tropospheric lifetime
Scopus关键词: Atoms
; Boundary layers
; Carbon dioxide
; Esters
; Free radicals
; Oxidants
; Oxidation
; Reaction kinetics
; Cl atoms
; Gamma butyrolactone
; Gamma-valerolactone(GVL)
; OH radical
; Oxidation products
; Rate coefficients
; Tropospheric lifetime
; Troposphere
; 3,4 dihydro 3 methyl 2,5 furandione
; acetic acid
; alpha methyl gamma butyrolactone
; biofuel
; carbon dioxide
; gamma butyrolactone derivative
; gamma valerolactone
; hydrogen
; lactone derivative
; maleic anhydride
; methyl group
; oxidizing agent
; unclassified drug
; aerosol
; atmospheric chemistry
; biofuel
; boundary layer
; chemical reaction
; half life
; hydroxyl radical
; marine environment
; organic compound
; oxidant
; oxidation
; reaction kinetics
; troposphere
; Article
; atmospheric pressure
; boundary layer
; chemical reaction kinetics
; photolysis
; priority journal
; ring opening
; troposphere
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Tropospheric lifetimes of two lactones, gamma-valerolactone (GVL) and alpha-methyl gamma-butyrolactone (AMGBL) in terms of their reactions with two important tropospheric oxidants- OH and Cl - are estimated, after determining the respective rate coefficients of their reactions in the gas phase using relative rate method. Values of the rate coefficients of the reactions of GVL (kOH = (1.95 ± 0.58) x 10−12; kCl = 2.26 ± 0.53 × 10−11 cm3molecule−1s−1) and AMGBL (kOH = 1.81 ± 0.43 × 10−12; kCl = 3.42 ± 0.63 × 10−11 cm3molecule−1s−1) at 298 K imply that reaction with OH is the dominant reaction in the ambient conditions, and that reaction with Cl atom becomes relevant under marine boundary layer (MBL) conditions, reducing the tropospheric lifetimes to almost half. The tropospheric life times of GVL and AMGBL based on their reaction with OH under ambient conditions are comparable, 71.2 and 76.7 h respectively. However, the products of the reactions are found to be different. In GVL, a promising second generation biofuel component, only ring opening reactions are important, acetic acid and CO2 being the only observed volatile products. In AMGBL, additional ring oxidized products are also formed, of which 3,4-dihydro-3-methyl-2,5-furandione is the most dominant one. The absence of such ring oxidized products in GVL is assigned to the difference in the preferred position of H atom abstraction, based on the computed rate coefficients of individual channels reported in the literature. This suggests that the impact in terms of aerosol generation in the troposphere may also be different for GVL and AMGBL, which differ only in the position of methyl substitution. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82385
Appears in Collections: 气候变化事实与影响
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作者单位: Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India
Recommended Citation:
Walavalkar M,P,, Sharma A,et al. Reactions of lactones with tropospheric oxidants: A kinetics and products study[J]. Atmospheric Environment,2017-01-01,161