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    Experimental and modeling study on pyrolysis of n-decane initiated by nitromethane

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    Type
    Article
    Authors
    Jia, Zhenjian
    Wang, Zhandong cc
    Cheng, Zhanjun
    Zhou, Weixing
    KAUST Department
    Clean Combustion Research Center
    Date
    2016-01-15
    Online Publication Date
    2016-01-15
    Print Publication Date
    2016-03
    Permanent link to this record
    http://hdl.handle.net/10754/621741
    
    Metadata
    Show full item record
    Abstract
    Initiator could accelerate the rate of hydrocarbon pyrolysis and reduce the required material temperatures for a hypersonic aircraft heat exchanger/reactor. Nitroalkanes were proposed as the effective initiator because of the lower CN bond dissociation energy. In order to investigate the initiation mechanism of nitroalkanes on hydrocarbon pyrolysis, the pyrolysis of n-decane, nitromethane and their binary mixture were carried out at 30, 150 and 760 Torr in a flow reactor with synchrotron vacuum ultraviolet photoionization mass spectrometry (SVUV-PIMS). The identified and quantified pyrolysis species include C1C2 alkanes, C2C10 alkenes, C3C6 dialkenes, C2C3 alkynes, nitrogen oxides such as NO and NO2, benzene, and radicals including CH3, C3H3, and C3H5, which shed light on the mechanism of n-decane and nitromethane pyrolysis, as well as the interactions of these two fuels. The experimental results indicate that the addition of nitromethane decreases the initial decomposition temperature of n-decane, and a stronger promotion effect could be obtained as the experimental pressure increases. The distributions of alkanes, alkenes, dialkenes, alkynes and benzene are also influenced by the addition of nitromethane. A detailed kinetic model with 266 species and 1648 reactions was developed and validated against the mole fraction profiles of reactants, major products and important intermediates during the pyrolysis of each fuel and their binary mixture. The satisfactory model prediction to the experimental measurements permits the analysis of the kinetic effect of nitromethane initiation on the pyrolysis of n-decane. So that, the increase of the conversion rate at a lower temperature, the selectivity of decomposition products, and reduction of benzene formation are better understood.
    Citation
    Jia Z, Wang Z, Cheng Z, Zhou W (2016) Experimental and modeling study on pyrolysis of n-decane initiated by nitromethane. Combustion and Flame 165: 246–258. Available: http://dx.doi.org/10.1016/j.combustflame.2015.12.010.
    Sponsors
    This research was supported by Natural Science Foundation of China (11079017), (U1432130). Dr. Hanfeng Jin and Dr. Mingfeng Xie are appreciated for the assistance in experiments at NSRL.
    Publisher
    Elsevier BV
    Journal
    Combustion and Flame
    DOI
    10.1016/j.combustflame.2015.12.010
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.combustflame.2015.12.010
    Scopus Count
    Collections
    Articles; Clean Combustion Research Center

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