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Synthesis of highly siliceous ZSM-5 using diaminoalkanes and their application for the conversion of methanol to light olefins
The use of organic bases in the synthesis of zeolites can lead to the crystallisation of several completely original structures. Zeolite ZSM-5 is produced using tetrapropylammonium cations. This cationic material can be replaced by amines or diamines, although in this case it becomes more difficult...
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| Format: | Thesis |
| Language: | English |
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Department of Chemical Engineering
2016
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| _version_ | 1867613295738880000 |
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| access_status_str | Open Access |
| author | Howden, Michael G |
| author2 | O'Connor, Cyril |
| author_browse | Howden, Michael G O'Connor, Cyril |
| author_facet | O'Connor, Cyril Howden, Michael G |
| author_sort | Howden, Michael G |
| collection | Thesis |
| description | The use of organic bases in the synthesis of zeolites can lead to the crystallisation of several completely original structures. Zeolite ZSM-5 is produced using tetrapropylammonium cations. This cationic material can be replaced by amines or diamines, although in this case it becomes more difficult to synthesise the zeolite. ZSM-5 has a three dimensional channel system, having apertures which are slightly larger than 0,5 nm. This means that during reactions, there is a control over the size of the molecules that can enter or exit from the pores of the zeolite: this process is called "shape selective11 catalysis. The conversion of methanol over ZSM-5 proceeds via dehydration to give firstly dimethyl ether and then light olefins. The olefins may subsequently undergo dehydrocyclisation to produce a mixture of light paraffins and aromatics, which are restricted to monocyclics and do not contain more than ten carbon atoms. As a result of these properties, ZSM-5 is an ideal catalyst for several industrial processes. Methanol can be converted directly to synthetic gasoline, or by restricting the conversion, olefins can be obtained. Naturally olefins themselves, as well as alkanes, can be converted to aromatics. An entirely different reaction has been found by using a high pressure and relative low temperature, where olefins can be oligomerised to produce diesel. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/21701 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:33:51.607Z |
| 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:11427/21701 Synthesis of highly siliceous ZSM-5 using diaminoalkanes and their application for the conversion of methanol to light olefins Howden, Michael G O'Connor, Cyril Chemical Engineering The use of organic bases in the synthesis of zeolites can lead to the crystallisation of several completely original structures. Zeolite ZSM-5 is produced using tetrapropylammonium cations. This cationic material can be replaced by amines or diamines, although in this case it becomes more difficult to synthesise the zeolite. ZSM-5 has a three dimensional channel system, having apertures which are slightly larger than 0,5 nm. This means that during reactions, there is a control over the size of the molecules that can enter or exit from the pores of the zeolite: this process is called "shape selective11 catalysis. The conversion of methanol over ZSM-5 proceeds via dehydration to give firstly dimethyl ether and then light olefins. The olefins may subsequently undergo dehydrocyclisation to produce a mixture of light paraffins and aromatics, which are restricted to monocyclics and do not contain more than ten carbon atoms. As a result of these properties, ZSM-5 is an ideal catalyst for several industrial processes. Methanol can be converted directly to synthetic gasoline, or by restricting the conversion, olefins can be obtained. Naturally olefins themselves, as well as alkanes, can be converted to aromatics. An entirely different reaction has been found by using a high pressure and relative low temperature, where olefins can be oligomerised to produce diesel. 2016-09-06T14:45:50Z 2016-09-06T14:45:50Z 1993 Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/21701 eng application/pdf Department of Chemical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Chemical Engineering Howden, Michael G Synthesis of highly siliceous ZSM-5 using diaminoalkanes and their application for the conversion of methanol to light olefins |
| thesis_degree_str | Doctoral |
| title | Synthesis of highly siliceous ZSM-5 using diaminoalkanes and their application for the conversion of methanol to light olefins |
| title_full | Synthesis of highly siliceous ZSM-5 using diaminoalkanes and their application for the conversion of methanol to light olefins |
| title_fullStr | Synthesis of highly siliceous ZSM-5 using diaminoalkanes and their application for the conversion of methanol to light olefins |
| title_full_unstemmed | Synthesis of highly siliceous ZSM-5 using diaminoalkanes and their application for the conversion of methanol to light olefins |
| title_short | Synthesis of highly siliceous ZSM-5 using diaminoalkanes and their application for the conversion of methanol to light olefins |
| title_sort | synthesis of highly siliceous zsm 5 using diaminoalkanes and their application for the conversion of methanol to light olefins |
| topic | Chemical Engineering |
| url | http://hdl.handle.net/11427/21701 |
| work_keys_str_mv | AT howdenmichaelg synthesisofhighlysiliceouszsm5usingdiaminoalkanesandtheirapplicationfortheconversionofmethanoltolightolefins |