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Propene oligomerization over steam dealuminated and boron and phospherous modified ZSM-5
Bibliography: pages 203-210.
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Department of Chemical Engineering
2016
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| _version_ | 1867613332198916096 |
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| access_status_str | Open Access |
| author | Andersen, Bo |
| author2 | O'Connor, Cyril T |
| author_browse | Andersen, Bo O'Connor, Cyril T |
| author_facet | O'Connor, Cyril T Andersen, Bo |
| author_sort | Andersen, Bo |
| collection | Thesis |
| description | Bibliography: pages 203-210. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/22049 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:34:27.383Z |
| 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:11427/22049 Propene oligomerization over steam dealuminated and boron and phospherous modified ZSM-5 Andersen, Bo O'Connor, Cyril T Kojima, Masami Fletcher, Jack Chemical Engineering Bibliography: pages 203-210. ZSM-5 was modified with boron and phosphorus compounds in an attempt to improve the selectivity of the catalyst with respect to the linearity of the liquid product of propene oligomerization. Boron was incorporated into the zeolite framework by inclusion in the synthesis gel. Boralite catalysts made in this way and containing very low Al contents had only weak acidity as was evident from only one, low temperature NH3 desorption peak at ca. 190 °C. These catalysts showed poor propene oligomerization activity as a result of the weak acidity arising from the weak B(OH)Si site and reduced catalyst free volume. The latter was ascribed to occluded B₂O₃ species. Activity of these catalysts was proportional to Al, rather than B content. No appreciable selectivity changes were observed for any of these catalysts. In an attempt to enhance the acidity and hence the activity of the boralite catalysts, mild fluorination treatments were carried out. A boralite catalyst containing 550 ppm Al and 1.2 wt% boron was treated with mild HF at room temperature. The activity of the catalyst was significantly reduced. The activity of the catalyst was essentially restored to its former level upon subsequent NH₄F treatment. The catalyst then contained 120 ppm Al and 0.8 wt% boron. Although some activity enhancement was achieved through mild fluorination, the catalyst utilization values (CUV) remained an order of magnitude lower than the CUV of unmodified ZSM-5. Catalytic activity remained proportional to trace Al content. 2016-10-03T04:07:35Z 2016-10-03T04:07:35Z 1991 Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/22049 eng application/pdf Department of Chemical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Chemical Engineering Andersen, Bo Propene oligomerization over steam dealuminated and boron and phospherous modified ZSM-5 |
| thesis_degree_str | Doctoral |
| title | Propene oligomerization over steam dealuminated and boron and phospherous modified ZSM-5 |
| title_full | Propene oligomerization over steam dealuminated and boron and phospherous modified ZSM-5 |
| title_fullStr | Propene oligomerization over steam dealuminated and boron and phospherous modified ZSM-5 |
| title_full_unstemmed | Propene oligomerization over steam dealuminated and boron and phospherous modified ZSM-5 |
| title_short | Propene oligomerization over steam dealuminated and boron and phospherous modified ZSM-5 |
| title_sort | propene oligomerization over steam dealuminated and boron and phospherous modified zsm 5 |
| topic | Chemical Engineering |
| url | http://hdl.handle.net/11427/22049 |
| work_keys_str_mv | AT andersenbo propeneoligomerizationoversteamdealuminatedandboronandphospherousmodifiedzsm5 |