Reactivity and Structure of Supported Nickel Phosphides (Ni₂P) in Deep Hydrodesulfurization Catalysis

dc.contributor.authorLee, Yong-Kulen
dc.contributor.committeechairOyama, Shigeo Teden
dc.contributor.committeememberDavis, Richey M.en
dc.contributor.committeememberSum, Amadeu K.en
dc.contributor.committeememberHanson, Brian E.en
dc.contributor.committeememberCox, David F.en
dc.contributor.departmentChemical Engineeringen
dc.date.accessioned2014-03-14T20:21:04Zen
dc.date.adate2005-01-26en
dc.date.available2014-03-14T20:21:04Zen
dc.date.issued2004-12-16en
dc.date.rdate2008-01-26en
dc.date.sdate2004-12-22en
dc.description.abstractThis dissertation describes preparation and characterization of Ni₂P catalysts and their application in deep hydrodesulfurization (HDS) of a model sulfur compound, 4,6-dimethyldibenzothiophene (4,6-DMDBT), one of the most refractory S-compounds. This topic is of great importance in addressing recently enacted environmental regulations limiting the sulfur content in fuels. The work carried out includes synthesis of Ni₂P on different siliceous supports, SiO₂, MCM-41, and ultra-stable Y zeolite (USY). It also includes determining the characteristics of the supported Ni₂P catalysts with a wide range of techniques: X-ray powder diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) and X-ray absorption fine structure (XAFS) spectroscopy. The use of these techniques allowed better understanding of the nature of the active sites as well as the effect of supports. Activity tests were conducted in the HDS of 4,6-DMDBT and the HDN of quinoline. The performance of the catalysts will be compared to that of a conventional sulfide hydrotreating catalyst, Ni-Mo-S/Al₂O₃. Investigation of the reaction mechanism in the hydrodenitrogenation (HDN) of 2-methylpiperidine together with in situ FT-IR measurements were conducted to understand how catalyst properties affect activity and selectivity.en
dc.description.degreePh. D.en
dc.identifier.otheretd-12222004-111955en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-12222004-111955/en
dc.identifier.urihttp://hdl.handle.net/10919/30228en
dc.publisherVirginia Techen
dc.relation.haspartYKLee_PhD_dissertation.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectHDSen
dc.subjectHDNen
dc.subject4,6-DMDBTen
dc.subjectEXAFSen
dc.subjectFTIRen
dc.subjectNickel phosphideen
dc.titleReactivity and Structure of Supported Nickel Phosphides (Ni₂P) in Deep Hydrodesulfurization Catalysisen
dc.typeDissertationen
thesis.degree.disciplineChemical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en
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