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The use of hydrotalcite derived catalyst precursors in the Fischer-Tropsch synthesis
Includes bibliographical references (leaves 92-96).
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Department of Chemical Engineering
2014
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| _version_ | 1867613146651295744 |
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| access_status_str | Open Access |
| author | Naidoo, Thiloshini |
| author2 | Van Steen, Eric |
| author_browse | Naidoo, Thiloshini Van Steen, Eric |
| author_facet | Van Steen, Eric Naidoo, Thiloshini |
| author_sort | Naidoo, Thiloshini |
| collection | Thesis |
| description | Includes bibliographical references (leaves 92-96). |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/5431 |
| 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:11427/5431 The use of hydrotalcite derived catalyst precursors in the Fischer-Tropsch synthesis Naidoo, Thiloshini Van Steen, Eric Bromfield, Tracy Chemical Engineering Includes bibliographical references (leaves 92-96). The current fused iron catalyst used in the high temperature Fischer-Tropsch process is not very responsive to chemical promotion. Thus the optimisation of the selectivity of this catalyst is restricted. In the development of a catalyst the aim is to obtain the best combination of activity, selectivity and stability with the optimum number of effective active sites of the catalyst exposed to the reaction medium [Gibson, 1999]. Catalysts that have a large catalytically active surface area exposed to the reaction can be obtained by having very small catalyst particles well dispersed on a support material [Augustine, 1996]. Supporting the iron metal used in the HTFT process onto a basic support should eliminate the problem associated with supported iron catalysts namely, the effect of "alkali dilution" caused by the migration of the alkali onto the support material [Dry,1981 ]. Hydrotalcites have been shown to provide a high surface area basic support [Schaper, 1989]. Supporting the iron metal used in Fischer-Tropsch synthesis onto the basic hydrotalcite eliminates the problems associated with supported alkali promoted iron catalyst and results in a catalyst system that can be controlled and optimised to produce catalysts with specific compositions and characteristics. Alternatively, the iron can be incorporated into the hydrotalcite structure to form an Mg-Fe hydrotalcite. This allows for interaction between the elements which may result in possible synergistic effects.The use of a Mg-Fe hydrotalcite in the Fischer-Tropsch synthesis was investigated in this study. Mg-Fe hydrotalcites were prepared with a molar ratio of Mg to Fe of 2:1. The catalyst was thereafter heat treated and activated prior to synthesis. The hydrotalcite derived catalyst showed an overall CO conversion of ca. 75% and conversion to FT products of ca. 40%. The performance was comparable to that of a standard fused catalyst which is typically used in the High Temperature Fischer-Tropsch process. 2014-07-31T11:14:57Z 2014-07-31T11:14:57Z 2007 Master Thesis Masters MSc http://hdl.handle.net/11427/5431 eng application/pdf Department of Chemical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Chemical Engineering Naidoo, Thiloshini The use of hydrotalcite derived catalyst precursors in the Fischer-Tropsch synthesis |
| thesis_degree_str | Master's |
| title | The use of hydrotalcite derived catalyst precursors in the Fischer-Tropsch synthesis |
| title_full | The use of hydrotalcite derived catalyst precursors in the Fischer-Tropsch synthesis |
| title_fullStr | The use of hydrotalcite derived catalyst precursors in the Fischer-Tropsch synthesis |
| title_full_unstemmed | The use of hydrotalcite derived catalyst precursors in the Fischer-Tropsch synthesis |
| title_short | The use of hydrotalcite derived catalyst precursors in the Fischer-Tropsch synthesis |
| title_sort | use of hydrotalcite derived catalyst precursors in the fischer tropsch synthesis |
| topic | Chemical Engineering |
| url | http://hdl.handle.net/11427/5431 |
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