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    Thermal fragmentation and deactivation of combustion-generated soot particles

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    Type
    Article
    Authors
    Raj, Abhijeet
    Tayouo Djinsu, Russell
    Cha, Dong Kyu
    LI, LIANG
    Ismail, Mohamed cc
    Chung, Suk Ho cc
    KAUST Department
    Advanced Membranes and Porous Materials Research Center
    Advanced Nanofabrication, Imaging and Characterization Core Lab
    Biological and Environmental Sciences and Engineering (BESE) Division
    Clean Combustion Research Center
    Combustion and Laser Diagnostics Laboratory
    Core Labs
    Imaging and Characterization Core Lab
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2014-09
    Permanent link to this record
    http://hdl.handle.net/10754/563733
    
    Metadata
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    Abstract
    The effect of thermal treatment on diesel soot and on a commercial soot in an inert environment under isothermal conditions at intermediate temperatures (400-900°C) is studied. Two important phenomena are observed in both the soot samples: soot fragmentation leading to its mass loss, and loss of soot reactivity towards O2. Several experimental techniques such as high resolution transmission electron microscopy, electron energy loss spectroscopy, thermo-gravimetric analysis with mass spectrometry, elemental analysis, Fourier transform infrared spectroscopy and X-ray diffraction have been used to identify the changes in structures, functional groups such as oxygenates and aliphatics, σ and π bonding, O/C and H/C ratios, and crystallite parameters of soot particles, introduced by heat. A decrease in the size of primary particles and an increase in the average polycyclic aromatic hydrocarbon (PAH) size was observed in soots after thermal treatment. The activation energies of soot oxidation for thermally treated soot samples were found to be higher than those for the untreated ones at most conversion levels. The cyclic or acyclic aliphatics with sp3 hybridization were present in significant amounts in all the soot samples, but their concentration decreased with thermal treatment. Interestingly, the H/C and the O/C ratios of soot particles increased after thermal treatment, and thus, they do not support the decrease in soot reactivity. The increase in the concentration of oxygenates on soot surface indicate that their desorption from soot surface in the form of CO, CO2 and other oxygenated compounds may not be significant at the temperatures (400-900°C) studied in this work. © 2014 The Combustion Institute.
    Citation
    Raj, A., Tayouo, R., Cha, D., Li, L., Ismail, M. A., & Chung, S. H. (2014). Thermal fragmentation and deactivation of combustion-generated soot particles. Combustion and Flame, 161(9), 2446–2457. doi:10.1016/j.combustflame.2014.02.010
    Sponsors
    This work has been supported by Saudi Aramco, KSA through KAUST CCRC and the Petroleum Institute, UAE.
    Publisher
    Elsevier BV
    Journal
    Combustion and Flame
    DOI
    10.1016/j.combustflame.2014.02.010
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.combustflame.2014.02.010
    Scopus Count
    Collections
    Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Advanced Membranes and Porous Materials Research Center; Imaging and Characterization Core Lab; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center; Water Desalination and Reuse Research Center (WDRC)

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