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    Understanding the synergistic blending octane behavior of 2-methylfuran

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    PROCI2019-BON of 2-methylfuran_revised_final-KAUST.pdf
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    1.063Mb
    Format:
    PDF
    Description:
    Accepted manuscript
    Embargo End Date:
    2022-12-07
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    Type
    Article
    Authors
    Shankar, Vijai cc
    Li, Yang cc
    Singh, Eshan cc
    Sarathy, Mani cc
    KAUST Department
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Clean Combustion Research Center
    Biological and Environmental Sciences and Engineering (BESE) Division
    Chemical Engineering Program
    Embargo End Date
    2022-12-07
    Submitted Date
    2019-11-07
    Permanent link to this record
    http://hdl.handle.net/10754/666289
    
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    Abstract
    The autoignition kinetics of hydrocarbons is an important criterion for selecting fuels for piston reciprocating engines, and it can be determined by relative performance to mixtures of alkanes, n-heptane and iso-octane, under certain standardized operating conditions. 2-methylfuran is a potential biofuel candidate, whose autoignition chemistry is markedly different from alkanes. Its octane behavior when blended with paraffins also shows a marked difference. The blending octane behavior of a fuel is characterized by its Blending Octane Number (BON). The BON of 2-methylfuran was extensively characterized in this work. 2-methylfuran's BON was mapped from experimental ignition delay times measured in a constant volume combustion chamber using established correlations. The effect on BON was studied depending on the RON of the base fuel into which 2-methylfuran was blended, as well as the quantity of 2-methylfuran blended. BON of 2-methyfuran was greater than its RON by a factor of four or more for some blends studied. BON reduced with increasing RON of the base fuel, as well as with increasing quantity of 2-methylfuran blended. A chemical kinetic model was created by integration of well validated sub-models for the blend components, and then used to explain the chemical kinetics leading to the extremely high BON values of 2-methylfuran. The synergetic anti-knock blending effect of 2-methylfuran is partially due to its physical properties leading to a greater molar fraction per volume fraction in the blend compared to iso-octane. Analysis using chemical kinetic model revealed that the chemical action behind 2-methylfuran's blending octane behavior was due to its ability to quench OH radicals which are important to the low-temperature oxidation chemistry of alkanes. This quenching effect is achieved due to the more rapid reaction rate of 2-methylfuran with OH radical compared to iso-octane, followed by the immediate conversion of the adduct shifting the equilibrium towards the product.
    Citation
    Shankar, V. S. B., Li, Y., Singh, E., & Sarathy, S. M. (2020). Understanding the synergistic blending octane behavior of 2-methylfuran. Proceedings of the Combustion Institute. doi:10.1016/j.proci.2020.06.277
    Sponsors
    The work at King Abdullah University of Science and Technology (KAUST) was supported by the KAUST Clean Fuels Consortium (KCFC) and its member companies.
    Publisher
    Elsevier BV
    Journal
    Proceedings of the Combustion Institute
    DOI
    10.1016/j.proci.2020.06.277
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S1540748920303692
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.proci.2020.06.277
    Scopus Count
    Collections
    Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Physical Science and Engineering (PSE) Division; Chemical Engineering Program; Mechanical Engineering Program; Clean Combustion Research Center

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