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    Analyzing the solid soot particulates formed in a fuel-rich flame by solvent-free MALDI FT ICR mass spectrometry.

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    Type
    Article
    Authors
    Zhang, Wen cc
    Shao, Can cc
    Sarathy, Mani cc
    KAUST Department
    Chemical Engineering Program
    Clean Combustion Research Center
    Combustion and Pyrolysis Chemistry (CPC) Group
    Mechanical Engineering Program
    Organics
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    OSR-1026-CRG5-C3033
    Date
    2020-01-15
    Online Publication Date
    2020-01-15
    Print Publication Date
    2020-02-28
    Embargo End Date
    2020-11-23
    Permanent link to this record
    http://hdl.handle.net/10754/660446
    
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    Abstract
    RATIONALE:The compositional and structural information of the soot particles is essential for a better understanding of the chemistry and mechanism during the combustion. The aim of the present study was to develop a method to analyze such soot particulate samples with high complexity and poor solubility. METHODS:The solvent-free sample preparation MALDI technique was combined with the ultrahigh resolution FT ICR mass spectrometry for the characterization of solid soot particulates. Moreover, a modified iso-abundance plot (Carbon Number vs. Hydrogen Number vs. Abundance) was introduced to visualize the distributions of various chemical species, and to examine the agreement between the hydrogen- abstraction- carbon- addition (HACA) mechanism and the polycyclic aromatic hydrocarbon growth in the investigated flame system. RESULTS:This solvent-free MALDI method enabled the effective ionization of the solid soot particulates without any dissolving procedure. With the accurate m/z ratios from FT ICR MS, a unique chemical formula was assigned to each of the recorded mass signals. The combustion products were proven to be mainly large polycyclic aromatic hydrocarbons, together with a small amount (<5%) of oxidized hydrocarbons. CONCLUSIONS:The developed method provides a new approach for the molecular characterization of soot particulates like carbonaceous materials. The investigated soot particulates are mainly polycyclic aromatic hydrocarbons (PAHs) with no or very short aliphatic chains. The PAHs growth mechanism during combustion can be examined against the classic HACA mechanism.
    Citation
    Zhang, W., Shao, C., & Sarathy, S. M. (2019). Analyzing the solid soot particulates formed in a fuel-rich flame by solvent-free MALDI FT ICR mass spectrometry. Rapid Communications in Mass Spectrometry. doi:10.1002/rcm.8596
    Sponsors
    The work was supported by the KAUST Office of Sponsored Research (OSR) under Award No. OSR-1026-CRG5-C3033, and Saudi Aramco under the FUELCOM program. This research used resources of the Core Labs of King Abdullah University of Science and Technology (KAUST).
    Publisher
    Wiley
    Journal
    Rapid Communications in Mass Spectrometry
    DOI
    10.1002/rcm.8596
    Additional Links
    https://onlinelibrary.wiley.com/doi/abs/10.1002/rcm.8596
    ae974a485f413a2113503eed53cd6c53
    10.1002/rcm.8596
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Engineering Program; Mechanical Engineering Program; Clean Combustion Research Center

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