Thermal fragmentation and deactivation of combustion-generated soot particles

Handle URI:
http://hdl.handle.net/10754/563733
Title:
Thermal fragmentation and deactivation of combustion-generated soot particles
Authors:
Raj, Abhijeet; Tayouo Djinsu, Russell; Cha, Dong Kyu; LI, LIANG; Ismail, Mohamed ( 0000-0003-4078-288X ) ; Chung, Suk-Ho ( 0000-0001-8782-312X )
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.
KAUST Department:
Clean Combustion Research Center; Water Desalination and Reuse Research Center (WDRC); Advanced Nanofabrication, Imaging and Characterization Core Lab; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Core Labs; Combustion and Laser Diagnostics Laboratory
Publisher:
Elsevier BV
Journal:
Combustion and Flame
Issue Date:
Sep-2014
DOI:
10.1016/j.combustflame.2014.02.010
Type:
Article
ISSN:
00102180
Sponsors:
This work has been supported by Saudi Aramco, KSA through KAUST CCRC and the Petroleum Institute, UAE.
Appears in Collections:
Articles; Advanced Nanofabrication, Imaging and Characterization Core Lab; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center; Water Desalination and Reuse Research Center (WDRC)

Full metadata record

DC FieldValue Language
dc.contributor.authorRaj, Abhijeeten
dc.contributor.authorTayouo Djinsu, Russellen
dc.contributor.authorCha, Dong Kyuen
dc.contributor.authorLI, LIANGen
dc.contributor.authorIsmail, Mohameden
dc.contributor.authorChung, Suk-Hoen
dc.date.accessioned2015-08-03T12:08:15Zen
dc.date.available2015-08-03T12:08:15Zen
dc.date.issued2014-09en
dc.identifier.issn00102180en
dc.identifier.doi10.1016/j.combustflame.2014.02.010en
dc.identifier.urihttp://hdl.handle.net/10754/563733en
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.en
dc.description.sponsorshipThis work has been supported by Saudi Aramco, KSA through KAUST CCRC and the Petroleum Institute, UAE.en
dc.publisherElsevier BVen
dc.subjectDeactivationen
dc.subjectFragmentationen
dc.subjectKineticsen
dc.subjectOxidationen
dc.subjectPAHen
dc.subjectSooten
dc.titleThermal fragmentation and deactivation of combustion-generated soot particlesen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.contributor.departmentAdvanced Nanofabrication, Imaging and Characterization Core Laben
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentMechanical Engineering Programen
dc.contributor.departmentCore Labsen
dc.contributor.departmentCombustion and Laser Diagnostics Laboratoryen
dc.identifier.journalCombustion and Flameen
dc.contributor.institutionDepartment of Chemical Engineering, The Petroleum Institute, Abu Dhabi, United Arab Emiratesen
kaust.authorRaj, Abhijeeten
kaust.authorCha, Dong Kyuen
kaust.authorLI, LIANGen
kaust.authorIsmail, Mohameden
kaust.authorChung, Suk-Hoen
kaust.authorTayouo Djinsu, Russellen
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