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dc.contributor.authorRaj, Abhijeet
dc.contributor.authorTayouo Djinsu, Russell
dc.contributor.authorCha, Dong Kyu
dc.contributor.authorLI, LIANG
dc.contributor.authorIsmail, Mohamed
dc.contributor.authorChung, Suk Ho
dc.date.accessioned2015-08-03T12:08:15Z
dc.date.available2015-08-03T12:08:15Z
dc.date.issued2014-09
dc.identifier.issn00102180
dc.identifier.doi10.1016/j.combustflame.2014.02.010
dc.identifier.urihttp://hdl.handle.net/10754/563733
dc.description.abstractThe 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.
dc.description.sponsorshipThis work has been supported by Saudi Aramco, KSA through KAUST CCRC and the Petroleum Institute, UAE.
dc.publisherElsevier BV
dc.subjectDeactivation
dc.subjectFragmentation
dc.subjectKinetics
dc.subjectOxidation
dc.subjectPAH
dc.subjectSoot
dc.titleThermal fragmentation and deactivation of combustion-generated soot particles
dc.typeArticle
dc.contributor.departmentAdvanced Membranes and Porous Materials Research Center
dc.contributor.departmentAdvanced Nanofabrication, Imaging and Characterization Core Lab
dc.contributor.departmentClean Combustion Research Center
dc.contributor.departmentCombustion and Laser Diagnostics Laboratory
dc.contributor.departmentCore Labs
dc.contributor.departmentImaging and Characterization Core Lab
dc.contributor.departmentMechanical Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)
dc.identifier.journalCombustion and Flame
dc.contributor.institutionDepartment of Chemical Engineering, The Petroleum Institute, Abu Dhabi, United Arab Emirates
kaust.personRaj, Abhijeet
kaust.personCha, Dong Kyu
kaust.personLI, LIANG
kaust.personIsmail, Mohamed
kaust.personChung, Suk Ho
kaust.personTayouo Djinsu, Russell


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