Investigation of Mixed Support Oxides in Methane Fueled Chemical Looping Combustion

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dc.contributor.advisorMahinpey, Nader
dc.contributor.authorElgarni, Moheddin Mohamed
dc.contributor.committeememberDe La Hoz Siegler, Hector
dc.contributor.committeememberHu, Jinguang
dc.date2021-06
dc.date.accessioned2020-11-03T15:12:04Z
dc.date.available2020-11-03T15:12:04Z
dc.date.issued2020-10-28
dc.description.abstractFossil fuels constitutes the main sources of energy as greenhouse gases emissions (GHGs) continue to rise which is the cause of climate change. In addition to alternative sources of energy, carbon capture is a necessary tool in mitigating the rise of CO2 (the major GHG contributor) emissions. The desire for efficient technology in power generation with CO2 capture led to a growing interest in chemical looping combustion (CLC). This alternative technology provides a pure CO2 stream without the energy penalty to capture it as an oxygen carrier allows for the combustion of the fuel in a N2 free environment. In this study, CH4 fueled CLC was investigated for Ni- and Cu-based oxygen carriers supported by Al2O3, CeO2, ZrO2 and their combinations. The oxygen carriers were synthesized using the incipient wetness impregnation technique and the mixed oxide supports were prepared using co-precipitation method. The testing of oxygen carriers was carried out using a Thermogravimetric Analyzer (TGA) to evaluate the reactivity and chemical stability of the samples. The oxygen carriers underwent 10 cycles of reduction and oxidation at 750°C, 850°C and 950°C. The following characterization tests were conducted on the samples: XRD, SEM/EDX and BET surface area analysis. The characterization tests were conducted on the samples after the final calcination of the oxygen carriers and after CLC tests. The XRD profiles led to the observation of the different phases from the active site-support interactions: NiAl2O4 and support-support interactions: CeAlO3. A positive correlation was observed between the oxygen capacity and the temperature in all Ni-based samples and most of Cu-based samples. The oxygen capacity of CuO/ZrO2 and CuO/CeO2 increased from 750°C to 850°C but decreased at 950°C. In some of the samples (such as NiO/CeO2, NiO/Al2O3-CeO2, NiO/Al2O3-CeO2-ZrO2, CuO/CeO2), the oxygen capacity exceeded the theoretical value for active site loading of 30% which was attributed to the partial reduction of NiAl2O4, CeO2 and ZrO2. In addition, in the samples with CeO2 and Al2O3 supports, NiAl2O4 was further reduced as promoted by the formation of CeAlO3. The kinetic parameters for the oxidation and reduction reactions were determined where the nucleation and nuclei growth model (NNG) and shrinking core model (SCM) were compared for the oxidation reaction. NNG model was found to be a better representative of the experimental data. The activation energy for NiO/Al2O3-ZrO2-CeO2 (11.3 kJ∙ mol-1) was found to be lower than NiO/Al2O3 (17.2 kJ∙ mol-1) and NiO/ZrO2 (36.6 kJ∙ mol-1) but higher than NiO/CeO2 (6.8 kJ∙ mol-1). This indicates the positive impact of the addition of CeO2 to Al2O3 and ZrO2 in the case of NiO/Al2O3-CeO2-ZrO2.en_US
dc.identifier.citationElgarni, M. M. (2020). Investigation of Mixed Support Oxides in Methane Fueled 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/38357
dc.identifier.urihttp://hdl.handle.net/1880/112721
dc.language.isoengen_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.subjectCO2 captureen_US
dc.subjectchemical looping combustionen_US
dc.subjectoxygen carrieren_US
dc.subjectNi-based oxygen carrieren_US
dc.subjectCu-based oxygen carrieren_US
dc.subjectmixed support oxidesen_US
dc.subjectcoke formationen_US
dc.subjectredox kineticen_US
dc.subjectnucleation and nuclei growthen_US
dc.subject.classificationEngineeringen_US
dc.subject.classificationEngineering--Chemicalen_US
dc.titleInvestigation of Mixed Support Oxides in Methane Fueled 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.requestcopytrueen_US
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