Haloethane Reactions over the Chromia Cr₂O₃ (1012) Surface

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dc.contributor.authorMa, Qiangen
dc.contributor.committeechairCox, David F.en
dc.contributor.committeememberDavis, Richey M.en
dc.contributor.committeememberOyama, Shigeo Teden
dc.contributor.departmentChemical Engineeringen
dc.date.accessioned2014-03-14T20:44:09Zen
dc.date.adate2005-09-01en
dc.date.available2014-03-14T20:44:09Zen
dc.date.issued2005-08-11en
dc.date.rdate2005-09-01en
dc.date.sdate2005-08-25en
dc.description.abstractEthyl iodide and ethyl chloride have been used as reactants to produce ethyl fragments on the stoichiometric α-Cr₂O₃ (1012) surface by means of thermal dissociation. Ethyl iodide is dissociated giving iodine adatoms and ethyl fragments bound to surface Cr cation sites, while ethyl chloride is dissociated giving chlorine adatoms and ethyl fragments. No oxygenated products are observed in thermal desorption, suggesting the 3-coordinate lattice oxygen on the stoichiometric α-Cr₂O₃ (1012) surface is very stable, and no nucleophilic attack occurs at the carbon atoms on surface ethyl fragments. For both reactants, the only reaction products observed are ethylene gas (CH₂=CH₂), ethane gas (CH₃-CH₃), hydrogen gas (H₂) and halogen adatoms (Cl<sub>ads</sub> or I<sub>ads</sub>). In thermal desorption experiments, all the gas phase products from ethyl chloride are produced in a reaction-limited, high temperature desorption feature attributed to a rate limiting β-hydride elimination from surface ethyl fragments. Similar product desorption features are observed for the reaction of ethyl iodide. However, the reaction of ethyl iodide also produces ethylene and ethane via a low temperature, desorption-limited reaction channel. It is postulated that I adatoms produced in the reaction of ethyl iodide thermal desorption might somehow promote a low temperature route to products that Cl adatoms do not.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-08252005-144859en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-08252005-144859/en
dc.identifier.urihttp://hdl.handle.net/10919/34754en
dc.publisherVirginia Techen
dc.relation.haspartHALOETHANEREACTIONSOVERTHECHROMIACr2O3(1012)SURFACE.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectdissociationen
dc.subjectethyl chlorideen
dc.subjectmetal oxideen
dc.subjecthydrogenationen
dc.subjectchromium (III) oxideen
dc.subjectdehydrogenationen
dc.subjecthaloethaneen
dc.subjectethyl iodideen
dc.titleHaloethane Reactions over the Chromia Cr₂O₃ (1012) Surfaceen
dc.typeThesisen
thesis.degree.disciplineChemical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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