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dc.contributor.authorWilliamson, James Georgeen
dc.date.accessioned2018-05-22T12:50:10Z
dc.date.available2018-05-22T12:50:10Z
dc.date.issued1979
dc.identifier.urihttp://hdl.handle.net/1842/30928
dc.description.abstracten
dc.description.abstractThe exchange of thiophene with deuterium and reactions of deuterium labelled propene and isobutene, followed by a combination of mass spectrometry and microwave spectroscopy, have been used to characterise the catalytic nature of a commercial CoO-MoO₃-Al₂O₃ (CMA) catalyst. It was observed in this work that the oxide-CMA was partially sulphided during the initial stages of ethanethiol hydrodesulphurization (hds) or as a result of exposure to hydrogen sulphide. The results of these exchange experiments indicated that the activity of partially sulphided CMA. closely resembled that of unsupported molybdenum disulphide (MoS₂) but was markedly different from that observed for oxide-CMA.en
dc.description.abstractInvestigation of the hds of ethanethiol, hydrogenation of ethene, hds of diethylsulphide and some relevant exchange reactions with deuterium over oxide-CMA, partially sulphided CMA and unsupported MoS₂ furnished a similar conclusion i.e. during hds, the partially sulphided CMA may be described as MoS₂ supported on, and stabilized by, alumina. Furthermore, by comparison of the relative rates of the various reactions on partially sulphided-CMA and MoS₂, it was possible to establish, in outline, a mechanistic scheme for the hds of ethanethiol: ethene, produced by elimination of hydrogen sulphide, was the major product of the hds reaction while ethane, involving hydrogenation, was produced in much lesser quantities.en
dc.description.abstractIn contrast, during the decomposition of ethanol, the oxygen analogue of ethanethiol, the CMA catalyst remained in the oxide form and the decomposition was found to occur by two alternative routes i.e. dehydrogenation to ethanal, which subsequently coupled to give butane as a secondary decomposition product, or dehydration to diethylether.en
dc.description.abstractThe higher surface charge density of oxide-CMA relative to partially sulphided CMA is believed to be the major contributor to the differences between the two catalyst systems.en
dc.publisherThe University of Edinburghen
dc.relation.ispartofAnnexe Thesis Digitisation Project 2018 Block 19en
dc.relation.isreferencedbyen
dc.titleReactions of ethanethiol and related compounds over CoO-MoO₃-A1₂o₃ and MoS₂ catalystsen
dc.typeThesis or Dissertationen
dc.type.qualificationlevelDoctoralen
dc.type.qualificationnamePhD Doctor of Philosophyen


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