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dc.contributor.advisorFriedrich, Holger Bernhard.
dc.creatorGovender, Mayashree.
dc.date.accessioned2011-01-26T13:01:34Z
dc.date.available2011-01-26T13:01:34Z
dc.date.created2004
dc.date.issued2004
dc.identifier.urihttp://hdl.handle.net/10413/2287
dc.descriptionThesis (M.Sc.)-University of KwaZulu Natal, 2004.en_US
dc.description.abstractThe use of supported catalysts to essentially combine the positive traits offered by both homogeneous and heterogeneous catalysis has become a competitive field of research. In particular, hydrotalcite-like catalysts (HTIc) has proven to be valuable for this purpose. Various osmium - containing catalysts were synthesized according to the co-precipitation method viz. Os-Cu-HTIc, Os-Ni-HTlc and the Os-Co-HTlc. Techniques such as SEM, IR, EDS, XRD, ICP, BET and XPS were exploited during catalyst characterisation and these essentially confirm that the hydrotalcite (HT) structure has been obtained. Various olefin substrates, ranging from simple straight-chained alkenes to cyclic, allylic and halogenated olefins, were tested. The results are promising and suggest that the diols are produced both with high selectivity and in good yield. Further experiments suggest: 1) Ofthe various co-oxidants tested, N-methylmorpholine-N-oxide is most suitable 2) The reaction proceeds faster at 60 °C than at room temperature 3) The addition of water to the reaction mixture increases the rate of the reaction for most substrates and 4) The catalyst is thermally stable and produces better results when calcined at 200 0 C prior to use This thesis reports that a new heterogeneous catalytic system for the efficient and selective cisdihydroxylation of olefins has been developed - one which suggests no leaching of metal into the reaction solution and no over-oxidation products.en_US
dc.language.isoenen_US
dc.subjectCatalysis.en_US
dc.subjectOrganic compounds--Synthesis.en_US
dc.subjectOlefins.en_US
dc.subjectLeaching.en_US
dc.subjectTheses--Chemistry.en_US
dc.subjectChemical equilibrium.en_US
dc.subjectMetal catalysts.en_US
dc.subjectHeterogeneous catalysis.en_US
dc.titleAn investigation of new heterogeneous hydrotalcite-like catalysts for the cis-dihydroxylation of olefins.en_US
dc.typeThesisen_US


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