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    Rate Coefficients of the Reaction of OH with Allene and Propyne at High Temperatures

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    Type
    Article
    Authors
    Es-sebbar, Et-touhami cc
    KHALED, Fethi cc
    Elwardani, Ahmed Elsaid cc
    Farooq, Aamir cc
    KAUST Department
    Chemical Kinetics & Laser Sensors Laboratory
    Clean Combustion Research Center
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2016-10-07
    Online Publication Date
    2016-10-07
    Print Publication Date
    2016-10-20
    Permanent link to this record
    http://hdl.handle.net/10754/622454
    
    Metadata
    Show full item record
    Abstract
    Allene (H2C═C═CH2; a-C3H4) and propyne (CH3C≡CH; p-C3H4) are important species in various chemical environments. In combustion processes, the reactions of hydroxyl radicals with a-C3H4 and p-C3H4 are critical in the overall fuel oxidation system. In this work, rate coefficients of OH radicals with allene (OH + H2C═C═CH2 → products) and propyne (OH + CH3C≡CH → products) were measured behind reflected shock waves over the temperature range of 843–1352 K and pressures near 1.5 atm. Hydroxyl radicals were generated by rapid thermal decomposition of tert-butyl hydroperoxide ((CH3)3–CO–OH), and monitored by narrow line width laser absorption of the well-characterized R1(5) electronic transition of the OH A–X (0,0) electronic system near 306.7 nm. Results show that allene reacts faster with OH radicals than propyne over the temperature range of this study. Measured rate coefficients can be expressed in Arrhenius form as follows: kallene+OH(T) = 8.51(±0.03) × 10–22T3.05 exp(2215(±3)/T), T = 843–1352 K; kpropyne+OH(T) = 1.30(±0.07) × 10–21T3.01 exp(1140(±6)/T), T = 846–1335 K.
    Citation
    Es-sebbar E, Khaled F, Elwardany A, Farooq A (2016) Rate Coefficients of the Reaction of OH with Allene and Propyne at High Temperatures. The Journal of Physical Chemistry A 120: 7998–8005. Available: http://dx.doi.org/10.1021/acs.jpca.6b04387.
    Sponsors
    Research reported in this paper was supported by the King Abdullah University of Science and Technology (KAUST) and by Saudi Aramco under the FUELCOM program.
    Publisher
    American Chemical Society (ACS)
    Journal
    The Journal of Physical Chemistry A
    DOI
    10.1021/acs.jpca.6b04387
    Additional Links
    http://pubs.acs.org/doi/full/10.1021/acs.jpca.6b04387
    ae974a485f413a2113503eed53cd6c53
    10.1021/acs.jpca.6b04387
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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