The use of hydrotalcite derived catalyst precursors in the Fischer-Tropsch synthesis

 

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dc.contributor.advisor Van Steen, Eric en_ZA
dc.contributor.advisor Bromfield, Tracy en_ZA
dc.contributor.author Naidoo, Thiloshini en_ZA
dc.date.accessioned 2014-07-31T11:14:57Z
dc.date.available 2014-07-31T11:14:57Z
dc.date.issued 2007 en_ZA
dc.identifier.citation Naidoo, T. 2007. The use of hydrotalcite derived catalyst precursors in the Fischer-Tropsch synthesis. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/5431
dc.description Includes bibliographical references (leaves 92-96).
dc.description.abstract 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. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Chemical Engineering en_ZA
dc.title The use of hydrotalcite derived catalyst precursors in the Fischer-Tropsch synthesis en_ZA
dc.type Thesis / Dissertation en_ZA
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Engineering & the Built Environment en_ZA
dc.publisher.department Department of Chemical Engineering en_ZA
dc.type.qualificationlevel Masters en_ZA
dc.type.qualificationname MSc en_ZA
uct.type.filetype Text
uct.type.filetype Image


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