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Methanol conversion to olefins and propene oligomerization over modified SAPO-34 and dealuminated mordenite
Bibliography: pages 225-233.
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| Format: | Thesis |
| Language: | English |
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Centre for Catalysis Research
2016
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| _version_ | 1867613215608799232 |
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| access_status_str | Open Access |
| author | Van Niekerk, Miles |
| author2 | Fletcher, Jack |
| author_browse | Fletcher, Jack Van Niekerk, Miles |
| author_facet | Fletcher, Jack Van Niekerk, Miles |
| author_sort | Van Niekerk, Miles |
| collection | Thesis |
| description | Bibliography: pages 225-233. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/22223 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:32:36.207Z |
| 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 | Centre for Catalysis Research |
| publisherStr | Centre for Catalysis Research |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/22223 Methanol conversion to olefins and propene oligomerization over modified SAPO-34 and dealuminated mordenite Van Niekerk, Miles Fletcher, Jack O'Connor, Cyril T Kojima, Masami Catalysis Research Bibliography: pages 225-233. SAP0-34 and mordenite, catalysts with quite different pore structures, are known to be suitable for methanol conversion to light olefins and propene oligomerization to a distillate type product, respectively. In this study, these catalysts were modified in various ways and the effect of these modifications on the activity and selectivity of the above two reactions investigated. SAP0-34, a small-pore silicoaluminophosphate molecular sieve, is highly selective in the formation of ethene and propene from methanol, but deactivates rapidly due to coke formation. This catalyst was synthesized and modified in various ways in an attempt to increase the catalyst lifetime and selectivity to ethene. Mild hydrothermal conditions encountered during deep-bed calcination of SAP0-34 were found to increase the catalyst lifetime. A number of further modifications were made to this deep-bed calcined material in an attempt to increase further the lifetime of this material. These modifications were : (i) Silanization - in order to neutralize the acidity on the external surface of the crystallites and hence reduce pore-mouth blockage by coke species on the crystallite external surface; (ii) Steaming - to investigate the effect of more severe hydrothermal conditions than those encountered under deep-bed-calcination conditions; (iii) Acid site poisoning by ammonia - in an attempt to reduce the rate of coke formation which takes place readily on strong acid sites; (iv) Boron impregnation - in order to reduce the intercrystalline void volume and thereby sterically hinder the formation of bulky coke molecules within the SAP0-34 pores; (v) Acid and caustic treatments - in order to reduce the catalyst acidity and thereby limit the rate of the coke formation reaction. 2016-10-20T03:38:54Z 2016-10-20T03:38:54Z 1992 Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/22223 eng application/pdf Centre for Catalysis Research Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Catalysis Research Van Niekerk, Miles Methanol conversion to olefins and propene oligomerization over modified SAPO-34 and dealuminated mordenite |
| thesis_degree_str | Doctoral |
| title | Methanol conversion to olefins and propene oligomerization over modified SAPO-34 and dealuminated mordenite |
| title_full | Methanol conversion to olefins and propene oligomerization over modified SAPO-34 and dealuminated mordenite |
| title_fullStr | Methanol conversion to olefins and propene oligomerization over modified SAPO-34 and dealuminated mordenite |
| title_full_unstemmed | Methanol conversion to olefins and propene oligomerization over modified SAPO-34 and dealuminated mordenite |
| title_short | Methanol conversion to olefins and propene oligomerization over modified SAPO-34 and dealuminated mordenite |
| title_sort | methanol conversion to olefins and propene oligomerization over modified sapo 34 and dealuminated mordenite |
| topic | Catalysis Research |
| url | http://hdl.handle.net/11427/22223 |
| work_keys_str_mv | AT vanniekerkmiles methanolconversiontoolefinsandpropeneoligomerizationovermodifiedsapo34anddealuminatedmordenite |