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    UV spectra and OH-oxidation kinetics of gaseous phase morpholinic compounds

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    Type
    Article
    Authors
    Rachidi, Mariam El cc
    El Masri, A. cc
    Roth, E.
    Chakir, A.
    KAUST Department
    Clean Combustion Research Center
    Date
    2014-05
    Permanent link to this record
    http://hdl.handle.net/10754/594255
    
    Metadata
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    Abstract
    This paper presents an experimental study of the UV spectra as well as the kinetics of gaseous phase OH-oxidation of morpholine, N-formylmorpholine (NFM) and N-acetlymorpholine (NAM). The spectra recorded using a UV spectrometer in the spectral range 200-280nm show that the analytes mainly absorb at wavelengths less than 280nm. This indicates that their photolysis potential in the troposphere is insignificant. Meanwhile, the OH-reactivity of these analytes was studied using a triple-jacket 2m long reactor equipped with a multi-reflection system and coupled to an FTIR spectrometer. The experiments were carried out at 295 and 313K for the amine and amides, respectively. The study was conducted in the relative mode using isoprene and benzaldehyde as reference compounds. The rate constants obtained are 14.0±1.9, 4.0±1.1 and 3.8±1.0 (in units of 10-11cm3molecule-1s-1) for morpholine, NFM and NAM respectively. These results are discussed in terms of reactivity and compared to those obtained for other oxy-nitrogenated species. In addition, the determined rate constants are used to estimate effective atmospheric lifetimes of the investigated morpholinic compounds with respect to reaction with OH radicals. © 2014 Elsevier Ltd.
    Citation
    Al Rashidi M, El Masri A, Roth E, Chakir A (2014) UV spectra and OH-oxidation kinetics of gaseous phase morpholinic compounds. Atmospheric Environment 88: 261–268. Available: http://dx.doi.org/10.1016/j.atmosenv.2014.01.057.
    Sponsors
    The authors would like to acknowledge the Region of Champagne-Ardenne for financing this study, as well as programs AQUAL and VOLUBILIS-AI no : .MA/10/226
    Publisher
    Elsevier BV
    Journal
    Atmospheric Environment
    DOI
    10.1016/j.atmosenv.2014.01.057
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.atmosenv.2014.01.057
    Scopus Count
    Collections
    Articles; Clean Combustion Research Center

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