Halocarbon Reactions on the Chromium (III) Oxide (101̲2) Surface

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dc.contributor.authorYork, Steven C.en
dc.contributor.committeechairCox, David F.en
dc.contributor.committeememberHanson, Brian E.en
dc.contributor.committeememberDillard, John G.en
dc.contributor.committeememberMarand, Evaen
dc.contributor.committeememberOyama, Shigeo Teden
dc.contributor.departmentChemical Engineeringen
dc.date.accessioned2014-03-14T21:17:49Zen
dc.date.adate1999-08-31en
dc.date.available2014-03-14T21:17:49Zen
dc.date.issued1999-08-13en
dc.date.rdate2000-08-31en
dc.date.sdate1999-08-21en
dc.description.abstractA nearly stoichiometric, (1×1) Cr₂O₃ (101̲2) surface was prepared from a single crystal of α-Cr₂O₃. The five-coordinate cations exposed at the stoichiometric surface dissociatively adsorb molecular oxygen to form a (1×1), terminating chromyl (Cr=O) layer that is stable to >1100 K. TDS and AES were used to investigate the reactivity of the halo-alkanes CFCl₂CH₂Cl, CF₂ClCH₂Cl, CF₃CH₂Cl, and CF₂CH₂F, in addition to the halo-alkenes CFCl=CH₂ and CF₂=CH₂. The halo-alkanes CFCl₂CH₂Cl, CF₂ClCH₂Cl, and CF₃CH₂Cl undergo 1,2-dihalo elimination similar to the Zn-catalyzed dehalogenation of vicinal dihalides to form alkenes. Some acetylene is also formed. The halo-alkenes CFCl=CH₂ and CF₂=CH₂ decompose to yield acetylene. Halogen removed from the molecules remains bound to the surface following TDS experiments and eventually terminates the surface chemistry due to site blocking of the cations. Reactivity is directly related to the chlorine content of the molecules investigated. Only CFCl₂CH₂Cl was reactive on a chromyl-terminated surface.en
dc.description.degreePh. D.en
dc.identifier.otheretd-082199-084653en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-082199-084653/en
dc.identifier.urihttp://hdl.handle.net/10919/39182en
dc.publisherVirginia Techen
dc.relation.haspartSCYdissertation-modified.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjecthalocarbonen
dc.subjectAESen
dc.subjectXPSen
dc.subjectacetyleneen
dc.subjectoxygen adsorptionen
dc.subjectchromium oxideen
dc.subjectdehalogenationen
dc.subjectsingle crystalen
dc.subjectCr₂O₃en
dc.subjecthaloalkeneen
dc.subjecthaloalkaneen
dc.titleHalocarbon Reactions on the Chromium (III) Oxide (101̲2) Surfaceen
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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