Use this URL to cite or link to this record in EThOS: | https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.706649 |
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Title: | Polyoxometalate catalysis for oxidative desulfurization | ||||||
Author: | Yahya, Rana |
ISNI:
0000 0004 6058 1978
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Awarding Body: | University of Liverpool | ||||||
Current Institution: | University of Liverpool | ||||||
Date of Award: | 2015 | ||||||
Availability of Full Text: |
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Abstract: | |||||||
Oxidative desulfurization removes sulfur-containing molecules from petroleum feedstocks to upgrade the quality of fuels. It is driven by environmental legislation demanding very low sulfur levels in fuels. The oxidative desulfurization technology usually involves oxidation of sulfur-containing molecules with an appropriate oxidant, e.g. hydrogen peroxide, organic peroxide, etc., followed by extraction of oxidation products from the petroleum feedstock. In this study, new efficient catalysts have been developed for the oxidation of benzothiophenes commonly found in diesel fuel, such as benzothiophene, dibenzothiophene and 4,6-dimethyldibenzothiophene, to the corresponding sulfones with hydrogen peroxide in two-phase system including immiscible aqueous and organic phases. These catalysts are based on polyoxometalates comprising Keggin type heteropolyanions [XM12O40]m- {X= Pv (m = 3) and Siv (m = 4) and phase transfer agents such as aminocyclotriphosphozenes or terminally functionalized polyisobutylene (PIB) oligomers. In this system, Keggin polyanions are transformed by excess H2O2 in aqueous phase to active peroxo polyoxometalate species which are transferred to the organic phase by the phase transfer agent where the oxidation of sulfur-containing molecules takes place.
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Supervisor: | Not available | Sponsor: | Not available | ||||
Qualification Name: | Thesis (Ph.D.) | Qualification Level: | Doctoral | ||||
EThOS ID: | uk.bl.ethos.706649 | DOI: | Not available | ||||
Keywords: | QD Chemistry | ||||||
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