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The chemical vapour deposition of Tetraethoxysilane on Zeolite ZSM-5
Bibliography: leaves 119-124.
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| Main Author: | |
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
| Published: |
Department of Chemical Engineering
2014
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| _version_ | 1867613146162659328 |
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| access_status_str | Open Access |
| author | Manstein, Heiko |
| author2 | Möller, Klaus |
| author_browse | Manstein, Heiko Möller, Klaus |
| author_facet | Möller, Klaus Manstein, Heiko |
| author_sort | Manstein, Heiko |
| collection | Thesis |
| description | Bibliography: leaves 119-124. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/5290 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:31:30.019Z |
| 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:11427/5290 The chemical vapour deposition of Tetraethoxysilane on Zeolite ZSM-5 Manstein, Heiko Möller, Klaus O'Connor, Cyril Chemical Engineering Bibliography: leaves 119-124. This thesis reports on the investigation of a cyclic chemical vapour deposition (CVD) method eliminating unwanted surface reactions and enhancing shape selective properties by depositing inert silica onto the external surface of zeolite ZSM-5. A CVD treatment consists out of a deposition, flushing and heating step followed by calcination in flowing air. Modifications are carried out in up to 33 cycles on one and the same sample employing tetraethoxysilane (TEOS) as silica precursor at deposition temperatures ranging from 50 to 400°C. After each CVD treatment the catalyst is tested with appropriate test reactions in order to quantify the extent of modification. The gradual inertisation of the external surface is followed with the catalytic cracking of 1,3,5-triisopropylbenzene (1,3,5-TiPB) which is too bulky to enter the micro-pore structure of ZSM-5. The disproportination of toluene (TDP) is employed to monitor changes of the internal activity and alterations in the shape selective properties of the catalyst. The analysis of reactor effluent during the deposition, flushing and heating step of the modification cycle allows investingating the reaction pathway. The deposition reaction proceeds with the reaction of the alkoxy groups of TEOS with the terminal hydroxyls of the zeolite under the formation of ethanol. 2014-07-31T11:07:25Z 2014-07-31T11:07:25Z 2001 Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/5290 eng application/pdf Department of Chemical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Chemical Engineering Manstein, Heiko The chemical vapour deposition of Tetraethoxysilane on Zeolite ZSM-5 |
| thesis_degree_str | Doctoral |
| title | The chemical vapour deposition of Tetraethoxysilane on Zeolite ZSM-5 |
| title_full | The chemical vapour deposition of Tetraethoxysilane on Zeolite ZSM-5 |
| title_fullStr | The chemical vapour deposition of Tetraethoxysilane on Zeolite ZSM-5 |
| title_full_unstemmed | The chemical vapour deposition of Tetraethoxysilane on Zeolite ZSM-5 |
| title_short | The chemical vapour deposition of Tetraethoxysilane on Zeolite ZSM-5 |
| title_sort | chemical vapour deposition of tetraethoxysilane on zeolite zsm 5 |
| topic | Chemical Engineering |
| url | http://hdl.handle.net/11427/5290 |
| work_keys_str_mv | AT mansteinheiko thechemicalvapourdepositionoftetraethoxysilaneonzeolitezsm5 AT mansteinheiko chemicalvapourdepositionoftetraethoxysilaneonzeolitezsm5 |