[Carbon-13] solid-state NMR study of ethylene oxidation over supported silver catalysts

dc.contributor.advisor Bernard C. Gerstein
dc.contributor.author Hosseini, Sadreddin
dc.contributor.department Chemistry
dc.date 2018-08-16T12:37:09.000
dc.date.accessioned 2020-06-30T07:01:13Z
dc.date.available 2020-06-30T07:01:13Z
dc.date.copyright Wed Jan 01 00:00:00 UTC 1992
dc.date.issued 1992
dc.description.abstract <p>Solid-state NMR has been used to study the interaction of ethylene with oxygen in the absence of promoters and moderators over silica-supported silver catalysts. Experiments using nitrous oxide and oxygen as the oxidants have been carried out over Ag/SiO[subscript]2 catalysts at temperature ranging from 298 to 613 K. Standard cross-polarization with magic angle spinning (CP/MAS), CP/MAS with dipolar dephasing, and single-pulse experiments have been applied to identify carbon containing species that are formed on the surface of catalyst at various temperatures. Ethylene, acetic acid, carbon dioxide, ethane and an alkoxy species have been identified. Under the above experimental conditions, no ethylene oxide is detected by NMR. In pursuit of a better understanding of the chemistry taking place on the catalyst, silica-supported silver catalysts as well as pure silica were dosed with labeled ethylene, carbon dioxide and ethylene oxide. It was found that under conditions employed in this study, ethylene oxide reacts with both metal and silica support and thus can not be observed as the reaction product. Ethylene oxide, however, has been observed after the saturation of silica surface with unlabeled ethylene oxide prior to ethylene oxidation.;In conjunction with this project, the author has designed and constructed a multiport high vacuum glass apparatus which was used for sample preparation prior to the NMR experiments as well as chemisorption measurements and a single-coil double resonance probe.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/10002/
dc.identifier.articleid 11001
dc.identifier.contextkey 6371793
dc.identifier.doi https://doi.org/10.31274/rtd-180813-12557
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/10002
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/63101
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/10002/r_9234817.pdf|||Fri Jan 14 18:12:05 UTC 2022
dc.subject.disciplines Physical Chemistry
dc.subject.keywords Physical chemistry
dc.subject.keywords Analytical Chemistry
dc.title [Carbon-13] solid-state NMR study of ethylene oxidation over supported silver catalysts
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication 42864f6e-7a3d-4be3-8b5a-0ae3c3830a11
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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