Characterization and Kinetic Study of Ilmenite Ores for Methane Chemical-Looping Combustion

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dc.contributor.advisorDe la Hoz Siegler, Hector
dc.contributor.advisorMahinpey, Nader
dc.contributor.authorKhakpoor, Nima
dc.contributor.committeememberPonnurangam, Sathish
dc.contributor.committeememberNassar, Nashaat
dc.date2018-06
dc.date.accessioned2018-01-19T00:59:21Z
dc.date.available2018-01-19T00:59:21Z
dc.date.issued2018-01-12
dc.description.abstractEmitted carbon dioxide from fossil fuels combustion is one of the most influential greenhouse gases leading to global warming. Chemical-looping combustion (CLC) is one of the most efficient methods for carbon capture, resulting in no energy penalty compared to alternative carbon capture methods. CLC is a nonconventional unmixed combustion process where the fuel and air reactions occur in separate reactors. CLC is, however, still a conceptual process due to a series of technical challenges, mainly related to the oxygen carrier. In particular, there is a need for a low-cost, highly stable oxygen carrier capable of withstanding multiple cycles without loss of its oxygen transport capacity and reactivity. Reactivity and oxygen-transport capacity of Canadian and commercial ilmenite ores in the chemical-looping combustion of methane were investigated in a thermogravimetric analyzer (TGA). Oxygen carrier performance was evaluated in multiple cycles during which Canadian ilmenite oxygen transport capacity increased from 2.7% to 14.2% and the commercial sample maintained an approximately constant oxygen transport capacity at 4.5%. XRD and SEM results indicate that new phases were formed, and surface morphology was transformed significantly during cyclic operation. The latter experimental finding explains the increased oxygen transport capacity of the Canadian ilmenite. Studies on carbon deposition on the ilmenite surface indicate that lower methane partial pressure and reduction temperatures are favorable to effectively prevent this phenomenon. The kinetic grain model (GM) was found satisfactorily to fit reduction rate data obtained at atmospheric pressure. Intrinsic reaction rates and kinetic parameters were assessed, accordingly. The activation energy values of 106.7 ± 10.6 kJ/mol and 95.0 ± 8.5 kJ/mol were estimated for the Canadian and commercial samples, respectively.en_US
dc.identifier.citationKhakpoor, N. (2018). Characterization and Kinetic Study of Ilmenite Ores for Methane Chemical-Looping Combustion (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca.en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/5365
dc.identifier.urihttp://hdl.handle.net/1880/106284
dc.language.isoenen_US
dc.publisher.facultySchulich School of Engineeringen_US
dc.publisher.institutionUniversity of Calgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.en_US
dc.subjectChemical-Looping Combustionen_US
dc.subjectCO2 Captureen_US
dc.subjectGrain Modelen_US
dc.subjectCyclic Redox Operationen_US
dc.subjectIlmeniteen_US
dc.subject.classificationEngineeringen_US
dc.subject.classificationEngineering--Chemicalen_US
dc.subject.classificationEngineering--Environmentalen_US
dc.titleCharacterization and Kinetic Study of Ilmenite Ores for Methane Chemical-Looping Combustionen_US
dc.typemaster thesisen_US
thesis.degree.disciplineEngineering – Chemical & Petroleumen_US
thesis.degree.grantorUniversity of Calgaryen_US
thesis.degree.nameMaster of Science (MSc)en_US
ucalgary.item.requestcopytrue
ucalgary.thesis.checklistI confirm that I have submitted all of the required forms to Faculty of Graduate Studies.en_US
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