The oligomerization of propene over nickel synthetic mica-montmorillonite

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dc.contributor.advisorO'Connor, Cyrilen_ZA
dc.contributor.advisorKojima, Men_ZA
dc.contributor.authorJacobs, Lester Lanceen_ZA
dc.date.accessioned2016-03-11T14:26:44Z
dc.date.available2016-03-11T14:26:44Z
dc.date.issued1987en_ZA
dc.descriptionBibliography: pages 150-156.en_ZA
dc.description.abstractThe catalytic oligomerization of propene to liquid fuels using synthetic mica montmorillonite (SMM) as well as the effect of incorporating nickel into the lattice and nickel, cobalt and zinc into the interlayer spaces was investigated. NiSMM is more active for propene oligomerization than SMM, although the product selectivity (60% of the oligomers boiled at above 453 K) is similar. The increase in activity of NiSMM is attributed to an increase in the surface acidity of the catalyst. The maximum activity over the nickel exchanged catalyst occurs at a nickel loading of 0.057 wt %. It is proposed that the bond strength of the acidic hydroxyl groups are perturbed by the polarizing effect of the divalent cation (Co, Zn or Ni) present in the interlayer spaces of SMM. The reduction of nickel, ion exchanged into SMM, removes the induction period associated with SMM and increases the catalyst lifetime. However, reduction of the lattice nickel results in a decrease in catalyst lifetime although the Bronsted acidity has increased. It is proposed that the metallic nickel present in reduced NiSMM may promote dehydrogenation of high molecular weight hydrocarbons thus causing rapid deactivation of the catalyst by increasing the formation of "graphitic" coke. The lifetime of NiSMM is greatly reduced by using a wet propene feed and reacting at higher temperatures (443 K) due to the generation of Bronsted sites and increased coke formation rates, respectively. Deactivation of the catalyst is associated with a "graphitic" coke build up. The RON of the petrol fraction is 94.5 and the hydrogenated diesel fraction has a cetane number less than 35.en_ZA
dc.identifier.apacitationJacobs, L. L. (1987). <i>The oligomerization of propene over nickel synthetic mica-montmorillonite</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Chemical Engineering. Retrieved from http://hdl.handle.net/11427/17656en_ZA
dc.identifier.chicagocitationJacobs, Lester Lance. <i>"The oligomerization of propene over nickel synthetic mica-montmorillonite."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Chemical Engineering, 1987. http://hdl.handle.net/11427/17656en_ZA
dc.identifier.citationJacobs, L. 1987. The oligomerization of propene over nickel synthetic mica-montmorillonite. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Jacobs, Lester Lance AB - The catalytic oligomerization of propene to liquid fuels using synthetic mica montmorillonite (SMM) as well as the effect of incorporating nickel into the lattice and nickel, cobalt and zinc into the interlayer spaces was investigated. NiSMM is more active for propene oligomerization than SMM, although the product selectivity (60% of the oligomers boiled at above 453 K) is similar. The increase in activity of NiSMM is attributed to an increase in the surface acidity of the catalyst. The maximum activity over the nickel exchanged catalyst occurs at a nickel loading of 0.057 wt %. It is proposed that the bond strength of the acidic hydroxyl groups are perturbed by the polarizing effect of the divalent cation (Co, Zn or Ni) present in the interlayer spaces of SMM. The reduction of nickel, ion exchanged into SMM, removes the induction period associated with SMM and increases the catalyst lifetime. However, reduction of the lattice nickel results in a decrease in catalyst lifetime although the Bronsted acidity has increased. It is proposed that the metallic nickel present in reduced NiSMM may promote dehydrogenation of high molecular weight hydrocarbons thus causing rapid deactivation of the catalyst by increasing the formation of "graphitic" coke. The lifetime of NiSMM is greatly reduced by using a wet propene feed and reacting at higher temperatures (443 K) due to the generation of Bronsted sites and increased coke formation rates, respectively. Deactivation of the catalyst is associated with a "graphitic" coke build up. The RON of the petrol fraction is 94.5 and the hydrogenated diesel fraction has a cetane number less than 35. DA - 1987 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1987 T1 - The oligomerization of propene over nickel synthetic mica-montmorillonite TI - The oligomerization of propene over nickel synthetic mica-montmorillonite UR - http://hdl.handle.net/11427/17656 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/17656
dc.identifier.vancouvercitationJacobs LL. The oligomerization of propene over nickel synthetic mica-montmorillonite. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Chemical Engineering, 1987 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/17656en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Chemical Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherChemical Engineeringen_ZA
dc.subject.otherSynthetic fuelsen_ZA
dc.subject.otherPropeneen_ZA
dc.titleThe oligomerization of propene over nickel synthetic mica-montmorilloniteen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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