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The oligomerisation of propene over nickel oxide silica alumina
Bibliography: pages 129-132.
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| Format: | Thesis |
| Language: | English |
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Department of Chemical Engineering
2016
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| _version_ | 1867613181665345536 |
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| access_status_str | Open Access |
| author | Harms, Stefan Mathias |
| author2 | Kojima, Masami |
| author_browse | Harms, Stefan Mathias Kojima, Masami |
| author_facet | Kojima, Masami Harms, Stefan Mathias |
| author_sort | Harms, Stefan Mathias |
| collection | Thesis |
| description | Bibliography: pages 129-132. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/22157 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:32:03.909Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| 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:11427/22157 The oligomerisation of propene over nickel oxide silica alumina Harms, Stefan Mathias Kojima, Masami O'Connor, Cyril T Propene Catalysts Nickel catalysts Catalysis Chemical Engineering Bibliography: pages 129-132. A synthesis techniQue was developed for the preparation of a nickel oxide sil ica alumina catalyst. The propene oligomerisation activity and the selectivity of the catalysts prepared by homogeneous decomposition deposition (HDD) were investigated and compared with nickel oxide silica alumina catalysts prepared by the techniQues of impregnation (IMP) and co-precipitation (SG). Amongst others. the effect of the nickel content. reacti6n temperature and pressure, and water content of the feed, on the activity and selectivity. were investigated. Also investigated were the lifetime of the various catalysts and, in the case of HDD type catalysts. the ability to oligomerise high molecular weight hydrocarbons (Cb). Nickel oxide silica alumina prepared by the HDD method is more active for the propene oligomerisation than catalysts prepared by the IMP and SG methods. The product spectrum in the case of IMP and HDD type catalysts are similar, with a propene dimer (Cb) being the main product. In the case of SG type catalysts. however. a shift to heavier products was observed, i.e., propene dimer (Cb) and trimer (Cq) were formed in eQual Quantities. It is proposed that the increase in activity of HDD type catalysts was due to a large extent of metal dispersion and distribution and a stronger interaction between the metal and the support. It is also proposed that the metal is readily accessible to the reactant molecules. The activity and selectivity of catalysts prepared by the HDD method were independent of the nickel content. This was not the case for IMP and SG type catalysts. both of which showed decreasing activity with increasing nickel content when the nickel content was increased beyond 5 wt%. The lifetimes of the various catalysts were also examined. From the results obtained. over the first 10 h. the lifetime of HOD type catalysts was superior to that of the other catalysts studied. The activity and selectivity of the various catalysts were sensitive to the reaction conditions. Thus moving into the vapour phase. by either increasing the temperature at a fixed pressure or decreasing the pressure at a fixed temperature. was in each case acCompanied by a shift to heavier products and a decrease in activity. 2016-10-16T09:50:21Z 2016-10-16T09:50:21Z 1987 Master Thesis Masters MSc (Eng) http://hdl.handle.net/11427/22157 eng application/pdf Department of Chemical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Propene Catalysts Nickel catalysts Catalysis Chemical Engineering Harms, Stefan Mathias The oligomerisation of propene over nickel oxide silica alumina |
| thesis_degree_str | Master's |
| title | The oligomerisation of propene over nickel oxide silica alumina |
| title_full | The oligomerisation of propene over nickel oxide silica alumina |
| title_fullStr | The oligomerisation of propene over nickel oxide silica alumina |
| title_full_unstemmed | The oligomerisation of propene over nickel oxide silica alumina |
| title_short | The oligomerisation of propene over nickel oxide silica alumina |
| title_sort | oligomerisation of propene over nickel oxide silica alumina |
| topic | Propene Catalysts Nickel catalysts Catalysis Chemical Engineering |
| url | http://hdl.handle.net/11427/22157 |
| work_keys_str_mv | AT harmsstefanmathias theoligomerisationofpropeneovernickeloxidesilicaalumina AT harmsstefanmathias oligomerisationofpropeneovernickeloxidesilicaalumina |