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Application of the transformation of 1,2,4-Trimethylbenzene to monitor the chemical vapour deposition of Tetraethoxysilane over ZSM-5
The present work reports an improved chemical vapour deposition (CVD) technique using low temperature, tetraethoxysilane (TEOS) and repeated CVD-calcination cycles. This results in a better control of the external surface activity and the pore mouth size of ZSM-5. In search for effective characteris...
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| Format: | Thesis |
| Language: | English |
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Department of Chemical Engineering
2016
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| _version_ | 1867613212337242113 |
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| access_status_str | Open Access |
| author | Röger, Hans Peter |
| author2 | Möller, Klaus |
| author_browse | Möller, Klaus Röger, Hans Peter |
| author_facet | Möller, Klaus Röger, Hans Peter |
| author_sort | Röger, Hans Peter |
| collection | Thesis |
| description | The present work reports an improved chemical vapour deposition (CVD) technique using low temperature, tetraethoxysilane (TEOS) and repeated CVD-calcination cycles. This results in a better control of the external surface activity and the pore mouth size of ZSM-5. In search for effective characterisation tools and a model reaction which involves molecules which are critical in size relative to the size of the ZSM-5 channels, the transformation of 1,2,4-trimethylbenzene (1,2,4-TMB) was investigated with respect to the reaction network, the role of the micropore space and the response to CVD treatments and Silicalite I coating. A generalised interpretation of the effect of modifications of the external surface activity and the pore mouth size on activity and shape selectivity of zeolites is proposed. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/19813 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:32:33.381Z |
| 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:11427/19813 Application of the transformation of 1,2,4-Trimethylbenzene to monitor the chemical vapour deposition of Tetraethoxysilane over ZSM-5 Röger, Hans Peter Möller, Klaus O'Connor, Cyril Chemical Engineering The present work reports an improved chemical vapour deposition (CVD) technique using low temperature, tetraethoxysilane (TEOS) and repeated CVD-calcination cycles. This results in a better control of the external surface activity and the pore mouth size of ZSM-5. In search for effective characterisation tools and a model reaction which involves molecules which are critical in size relative to the size of the ZSM-5 channels, the transformation of 1,2,4-trimethylbenzene (1,2,4-TMB) was investigated with respect to the reaction network, the role of the micropore space and the response to CVD treatments and Silicalite I coating. A generalised interpretation of the effect of modifications of the external surface activity and the pore mouth size on activity and shape selectivity of zeolites is proposed. 2016-05-24T09:13:46Z 2016-05-24T09:13:46Z 1998 Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/19813 eng application/pdf Department of Chemical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Chemical Engineering Röger, Hans Peter Application of the transformation of 1,2,4-Trimethylbenzene to monitor the chemical vapour deposition of Tetraethoxysilane over ZSM-5 |
| thesis_degree_str | Doctoral |
| title | Application of the transformation of 1,2,4-Trimethylbenzene to monitor the chemical vapour deposition of Tetraethoxysilane over ZSM-5 |
| title_full | Application of the transformation of 1,2,4-Trimethylbenzene to monitor the chemical vapour deposition of Tetraethoxysilane over ZSM-5 |
| title_fullStr | Application of the transformation of 1,2,4-Trimethylbenzene to monitor the chemical vapour deposition of Tetraethoxysilane over ZSM-5 |
| title_full_unstemmed | Application of the transformation of 1,2,4-Trimethylbenzene to monitor the chemical vapour deposition of Tetraethoxysilane over ZSM-5 |
| title_short | Application of the transformation of 1,2,4-Trimethylbenzene to monitor the chemical vapour deposition of Tetraethoxysilane over ZSM-5 |
| title_sort | application of the transformation of 1 2 4 trimethylbenzene to monitor the chemical vapour deposition of tetraethoxysilane over zsm 5 |
| topic | Chemical Engineering |
| url | http://hdl.handle.net/11427/19813 |
| work_keys_str_mv | AT rogerhanspeter applicationofthetransformationof124trimethylbenzenetomonitorthechemicalvapourdepositionoftetraethoxysilaneoverzsm5 |