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dc.contributor.advisorBasset, Jean-Marie
dc.contributor.authorAl Mana, Noor
dc.date.accessioned2016-06-22T12:55:55Z
dc.date.available2017-06-15T00:00:00Z
dc.date.issued2016-06-19
dc.identifier.doi10.25781/KAUST-68A3O
dc.identifier.urihttp://hdl.handle.net/10754/614070
dc.description.abstractThe development of highly selective and active, long-lasting, robust, low-cost and environmentally benign catalytic materials is the greatest challenge in the area of catalysis study. In this context, core-shell structures where the active sites are embedded inside the protecting shell have attracted a lot of researchers working in the field of catalysis owing to their enhanced physical and chemical properties suppress catalyst deactivation. Also, a new active site generated at the interface between the core and shell may increases the activity and efficiency of the catalyst in catalytic reactions especially for oxide shells that exhibit redox properties such as TiO2 and CeO2. Moreover, coating oxide layer over metal nanoparticles (NPs) can be designed to provide porosity (micropore/mesopore) that gives selectivity of the various reactants by the different gas diffusion rates. In this thesis, we will discuss the concept of catalyst stabilization against metal sintering by a core-shell system. In particular we will study the mechanistic of forming core-shell particles and the key parameters that can influence the properties and morphology of the Pt metal particle core and SiO2 shell (Pt@SiO2) using the reverse micro-emulsion method. The Pt@SiO2 core-shell catalysts were investigated for low-temperature CO oxidation reaction. The study was further extended to other catalytic applications by varying the composition of the core as well as the chemical nature of the shell material. The Pt NPs were embedded within another oxide matrix such as ZrO2 and TiO2 for CO oxidation reaction. These materials were studied in details to identify the factors governing the coating of the oxide around the metal NPs. Next, a more challenging system, namely, bimetallic Ni9Pt NPs embedded in TiO2 and ZrO2 matrix were investigated for dry reforming of methane reaction at high temperatures. The challenges of designing Ni9Pt@oxide core-shell structure with TiO2 and ZrO2 and their tolerance of the structure to the conditions of dry reforming of methane will be discussed.
dc.language.isoen
dc.subjectCore-Shell
dc.subjectPt@SiO2
dc.subjectCO oxidation
dc.subjectmicro-emulsion
dc.subjectPt on SiO2
dc.subjectkinetic Study
dc.titleDesign of Embedded Metal Catalysts via Reverser Micro-Emulsion System: a Way to Suppress Catalyst Deactivation by Metal Sintering
dc.typeDissertation
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.rights.embargodate2017-06-15
thesis.degree.grantorKing Abdullah University of Science and Technology
dc.contributor.committeememberTakanabe, Kazuhiro
dc.contributor.committeememberSaikaly, Pascal
dc.contributor.committeememberFornasiero, Paolo
thesis.degree.disciplineChemical Science
thesis.degree.nameDoctor of Philosophy
dc.rights.accessrightsAt the time of archiving, the student author of this dissertation opted to temporarily restrict access to it. The full text of this dissertation became available to the public after the expiration of the embargo on 2017-06-15.
refterms.dateFOA2017-06-15T00:00:00Z


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