Adsorption of water and carbon monoxide on Cu₂O(111) single crystal surfaces

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dc.contributor.authorChristiaen, Anne-Claireen
dc.contributor.committeechairCox, David F.en
dc.contributor.committeememberMarand, Evaen
dc.contributor.committeememberOyama, Shigeo Teden
dc.contributor.departmentChemical Engineeringen
dc.date.accessioned2014-03-14T21:49:29Zen
dc.date.adate2009-11-10en
dc.date.available2014-03-14T21:49:29Zen
dc.date.issued1994-08-04en
dc.date.rdate2009-11-10en
dc.date.sdate2009-11-10en
dc.description.abstractWater and CO adsorptions were studied over the stoichiometric and the oxygen-deficient Cu₂O(111) surfaces, using thermal desorption spectroscopy (TDS), ultraviolet photoelectron spectroscopy (UPS), and X-ray photoelectron spectroscopy (XPS). Water is the only desorbing species detected in TDS and the extent of dissociation is unaffected by the surface condition: ≃ 0.25 monolayers of water dissociate on Cu₂O(111) regardless of surface condition. The local defect environment around oxygen vacancies does not play a significant role in the activity of the Cu₂O(111) surface for the dissociation of water. CO is found to bind molecularly to the surface through the carbon atom and with a heat of adsorption of 22 kcal/mol, higher value than that of CO on Cu₂O(100) (16.7 kcal/mol). This suggests that the local geometry of adsorption sites may play an important role in the way CO binds to Cu₂O surfaces. Electronic changes upon CO adsorption and the higher heat of adsorption indicate an increased σ-donor character for CO, with some π-backbonding interactions. The local defect environment around oxygen vacancies does not appear to affect CO adsorption on Cu₂O(111) surfaces.en
dc.description.degreeMaster of Scienceen
dc.format.extentvi, 79 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-11102009-020324en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-11102009-020324/en
dc.identifier.urihttp://hdl.handle.net/10919/45628en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1994.C575.pdfen
dc.relation.isformatofOCLC# 31594015en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1994.C575en
dc.subject.lcshAdsorptionen
dc.subject.lcshCarbon dioxide -- Absorption and adsorptionen
dc.subject.lcshCopper oxide -- Absorption and adsorptionen
dc.subject.lcshWater -- Absorption and adsorptionen
dc.titleAdsorption of water and carbon monoxide on Cu₂O(111) single crystal surfacesen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineChemical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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