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Aromatization over platinum/zeolite L catalysts : the effect of oxygenates
Bibliography: leaves 269-280.
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| Format: | Thesis |
| Language: | English |
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Department of Chemical Engineering
2014
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| _version_ | 1867613321109176320 |
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| access_status_str | Open Access |
| author | Nash, Robin John |
| author2 | Dry, Mark |
| author_browse | Dry, Mark Nash, Robin John |
| author_facet | Dry, Mark Nash, Robin John |
| author_sort | Nash, Robin John |
| collection | Thesis |
| description | Bibliography: leaves 269-280. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/9492 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:34:14.045Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2014 |
| publishDateRange | 2014 |
| publishDateSort | 2014 |
| publisher | Department of Chemical Engineering |
| publisherStr | Department of Chemical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/9492 Aromatization over platinum/zeolite L catalysts : the effect of oxygenates Nash, Robin John Dry, Mark Applied Science Bibliography: leaves 269-280. In 1980, Bernard reported that platinum dispersed on zeolite LTL (Pt/KU had exceptionally high selectivity for the aromatization of n-hexane to benzene. The selectivity was ca. 95 at 99 conversion of n-hexane. This Pt/KL catalyst has been extensively studied to determine the reasons for the exceptional stability and benzene yields relative to platinum supported on silica (Pt/Si0₂ ) and alumina (Pt/Al₂0₃). The Pt/KL catalyst was found to be monofunctional with all the activity occurring on platinum metal clusters inside the pores of zeolite L. The catalyst exhibits excellent stability and the Aromax Process developed by Chevron Ltd., using I a barium doped Pt/KL catalyst, PtBa/KL, has been reported to operate continually for the equivalent of one year during accelerated deactivation testing at 450°C and a hydrogen partial pressure of 6 bar. However, sulphur-containing I compounds such as thiophene, result in rapid and irreversible deactivation of the catalyist due to sintering of platinum clusters. Thus the level of sulphur-containing I compounds, especially thiophene, must be kept below 50 ppb of the feed to avoid deactivation by sintering. SASOL Ltd. may be in a unique position to use Pt/KL as a catalyst for the aromatization of hexanes and heptanes to benzene and toluene respectively, as their products which are produced by the Fischer-Tropsch process are sulphur free. However, a substantial amount of oxygenates are formed in the Fischdr-Tropsch process and as yet no study has been undertaken to determine the effect of these compounds on the activity and selectivity of the catalyst. 2014-11-10T09:02:26Z 2014-11-10T09:02:26Z 1997 Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/9492 eng application/pdf Department of Chemical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Applied Science Nash, Robin John Aromatization over platinum/zeolite L catalysts : the effect of oxygenates |
| thesis_degree_str | Doctoral |
| title | Aromatization over platinum/zeolite L catalysts : the effect of oxygenates |
| title_full | Aromatization over platinum/zeolite L catalysts : the effect of oxygenates |
| title_fullStr | Aromatization over platinum/zeolite L catalysts : the effect of oxygenates |
| title_full_unstemmed | Aromatization over platinum/zeolite L catalysts : the effect of oxygenates |
| title_short | Aromatization over platinum/zeolite L catalysts : the effect of oxygenates |
| title_sort | aromatization over platinum zeolite l catalysts the effect of oxygenates |
| topic | Applied Science |
| url | http://hdl.handle.net/11427/9492 |
| work_keys_str_mv | AT nashrobinjohn aromatizationoverplatinumzeolitelcatalyststheeffectofoxygenates |