DOI: 10.1016/j.atmosenv.2013.10.039
Scopus记录号: 2-s2.0-84887256309
论文题名: Photolysis of 2,3-pentanedione and 2,3-hexanedione: Kinetics, quantum yields, and product study in a simulation chamber
作者: Bouzidi H ; , Fittschen C ; , Coddeville P ; , Tomas A
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 82 起始页码: 250
结束页码: 257
语种: 英语
英文关键词: Atmosphere
; Dicarbonyl
; OVOC
; Oxygenated Volatile Organic Compound
Scopus关键词: Dicarbonyl
; Dicarbonyl compounds
; Gas-phase photolysis
; OVOC
; Photolysis rates
; Reaction mechanism
; Simulation chambers
; Wavelength ranges
; Atmospheric pressure
; Earth atmosphere
; Free radicals
; Ketones
; Quantum yield
; Volatile organic compounds
; Wavelength
; Photolysis
; 2,3 hexanedione
; 2,3 pentanedione
; acetylacetone
; carbonyl derivative
; carboxylic acid
; diketone
; hydroxyl radical
; peroxy radical
; unclassified drug
; atmospheric pressure
; dominance
; ketone
; photolysis
; simulation
; temperature effect
; volatile organic compound
; article
; atmospheric pressure
; chemical reaction kinetics
; photolysis
; priority journal
; quantitative analysis
; quantum yield
; reaction analysis
; room temperature
; 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: The gas phase photolysis of two α-diketones, 2,3-pentanedione (PTD) and 2,3-hexanedione (HEX), has been studied in a Teflon simulation chamber using UV lamps in the 330-480nm wavelength range. Photolysis rates have been determined at room temperature and atmospheric pressure. Using NO2 actinometry allows estimating the lifetime of PTD and HEX in the atmosphere to be about 2.5h, assessing the dominance of the photolysis loss process over the OH reaction for such α-dicarbonyl compounds. Effective quantum yields for PTD and HEX have also been calculated over the whole wavelength range: ΦPTD=0.20±0.02 and ΦHEx=0.18±0.03, consistent with literature values on α-dicarbonyls. Various end-products from the photolysis of PTD and HEX have been identified and quantified. For PTD, CH2O and CH3CHO have been detected with molar yields of (48±0.5)% and (41±0.7)%, respectively. For HEX, CH2O and C2H5CHO have been detected with molar yields of (45±1.1)% and (37±0.8)%, respectively. Small amounts of CO have also been observed, with yields of about 2%, as well as organic acids. Experiments performed in the absence of OH-radical scavengers showed significantly faster photolysis rates and higher CO yields (~7%), indicating clear formation of OH radicals in the chemical systems. A reaction mechanism was developed for PTD and HEX photolysis based on the product observations, which allowed simulating the reactant and product time profiles with very good agreement. The present work represents the first study of 2,3-pentanedione and 2,3-hexanedione photolysis, to our knowledge, and may contribute to a better understanding of the photolysis of the α-diketones in the troposphere. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81168
Appears in Collections: 气候变化事实与影响
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作者单位: Univ. Lille Nord de France, F-59500 Lille, France; Mines Douai, F-59508 Douai, France; PC2A - CNRS - Université Lille 1, F-59655 Villeneuve d'Ascq, France
Recommended Citation:
Bouzidi H,, Fittschen C,, Coddeville P,et al. Photolysis of 2,3-pentanedione and 2,3-hexanedione: Kinetics, quantum yields, and product study in a simulation chamber[J]. Atmospheric Environment,2014-01-01,82