Reduced molybdenum oxidation states in hydrodesulfurization catalysis by Chevrel phases

dc.contributor.advisor Glenn L. Schrader
dc.contributor.author Ekman, Mark
dc.contributor.department Chemical and Biological Engineering
dc.date 2018-08-15T14:50:31.000
dc.date.accessioned 2020-06-30T07:01:27Z
dc.date.available 2020-06-30T07:01:27Z
dc.date.copyright Tue Jan 01 00:00:00 UTC 1991
dc.date.issued 1991
dc.description.abstract <p>The catalytic activities of reduced (relative to Mo[superscript]4+) molybdenum sulfides, known as Chevrel phases, have been evaluated for thiophene and benzothiophene hydrodesulfurization (HDS) and 1-butene hydrogenation (HYD). These materials have been found to have HDS activities comparable to, or greater than, model unpromoted and cobalt-promoted MoS[subscript]2 catalysts; in contrast, Chevrel phases exhibit low activities for 1-butene HYD;X-ray powder diffraction and laser Raman spectroscopy analysis of the used (10 hours of thiophene reaction) catalysts indicated that the bulk structures were stable under reaction conditions. XPS analysis demonstrated that reduced molybdenum oxidation states were present at the surface, compared to the Mo[superscript]4+ state of MoS[subscript]2 catalysts;The effect of the oxidation state of molybdenum on the catalytic HDS of thiophene was investigated using a series of lead-lutetium Chevrel phases with compositions of Lu[subscript]1.2xPbMo[subscript]6S[subscript]8 for 0≤ x≤ 0.2, and Lu[subscript]1.2xPb[subscript]1-xMo[subscript]6S[subscript]8 for 0.2</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/10029/
dc.identifier.articleid 11028
dc.identifier.contextkey 6384993
dc.identifier.doi https://doi.org/10.31274/rtd-180813-12004
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/10029
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/63130
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/10029/r_9202350.pdf|||Fri Jan 14 18:12:21 UTC 2022
dc.subject.disciplines Chemical Engineering
dc.subject.disciplines Inorganic Chemistry
dc.subject.disciplines Petroleum Engineering
dc.subject.keywords Chemical engineering
dc.title Reduced molybdenum oxidation states in hydrodesulfurization catalysis by Chevrel phases
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication 86545861-382c-4c15-8c52-eb8e9afe6b75
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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