Strong-metal–support interaction by molecular design: Fe–silicate interactions in Fischer–Tropsch catalysts

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dc.contributor.authorMogorosi, Ramoshibidu P
dc.contributor.authorFischer, Nico
dc.contributor.authorClaeys, Michael
dc.contributor.authorvan Steen, Eric
dc.date.accessioned2016-07-26T10:46:36Z
dc.date.available2016-07-26T10:46:36Z
dc.date.issued2012
dc.date.updated2016-07-14T17:40:14Z
dc.description.abstractMetal–support interactions in the form of iron–silicate were investigated by an inverse approach, that is, modification of nano-sized iron oxide with surface silicate groups. The presence of surface silicate groups in the calcined catalyst precursor was confirmed using diffuse reflectance infra-red Fourier transform analysis. The genesis of the various iron phases in the presence of surface silicate groups after H2-activation and the Fischer–Tropsch synthesis was followed. The surface silicate groups are preserved after a hydrogen treatment at 350 C for 16 h, and these surface ligands are associated with the residual iron oxide phase, wüstite. During the Fischer–Tropsch synthesis, a-Fe is mostly converted into v-Fe5C2, whereas FeO is the main source for e-Fe2C. The activity per unit surface area of hexagonal carbide, eFe2C, is ca. 25% higher than that of v-Fe5C2. The presence of surface silicate ligands on e-Fe2C results in a further enhancement of the rate per unit surface area of e-Fe2C by a factor of ca. 3. This is being ascribed to the enhanced availability of hydrogen on the surface due to the presence of the surface silicate groups, which also results in an increase in the methane selectivity, a decrease in the olefin content and a decrease in formation of branched product compounds.en_ZA
dc.identifierhttp://dx.doi.org/10.1016/j.jcat.2012.02.002
dc.identifier.apacitationMogorosi, R. P., Fischer, N., Claeys, M., & van Steen, E. (2012). Strong-metal–support interaction by molecular design: Fe–silicate interactions in Fischer–Tropsch catalysts. <i>Journal of Catalysis</i>, http://hdl.handle.net/11427/20758en_ZA
dc.identifier.chicagocitationMogorosi, Ramoshibidu P, Nico Fischer, Michael Claeys, and Eric van Steen "Strong-metal–support interaction by molecular design: Fe–silicate interactions in Fischer–Tropsch catalysts." <i>Journal of Catalysis</i> (2012) http://hdl.handle.net/11427/20758en_ZA
dc.identifier.citationMogorosi, R. P., Fischer, N., Claeys, M., & van Steen, E. (2012). Strong-metal–support interaction by molecular design: Fe–silicate interactions in Fischer–Tropsch catalysts. Journal of catalysis, 289, 140-150.en_ZA
dc.identifier.issn0021-9517en_ZA
dc.identifier.ris TY - Journal Article AU - Mogorosi, Ramoshibidu P AU - Fischer, Nico AU - Claeys, Michael AU - van Steen, Eric AB - Metal–support interactions in the form of iron–silicate were investigated by an inverse approach, that is, modification of nano-sized iron oxide with surface silicate groups. The presence of surface silicate groups in the calcined catalyst precursor was confirmed using diffuse reflectance infra-red Fourier transform analysis. The genesis of the various iron phases in the presence of surface silicate groups after H2-activation and the Fischer–Tropsch synthesis was followed. The surface silicate groups are preserved after a hydrogen treatment at 350 C for 16 h, and these surface ligands are associated with the residual iron oxide phase, wüstite. During the Fischer–Tropsch synthesis, a-Fe is mostly converted into v-Fe5C2, whereas FeO is the main source for e-Fe2C. The activity per unit surface area of hexagonal carbide, eFe2C, is ca. 25% higher than that of v-Fe5C2. The presence of surface silicate ligands on e-Fe2C results in a further enhancement of the rate per unit surface area of e-Fe2C by a factor of ca. 3. This is being ascribed to the enhanced availability of hydrogen on the surface due to the presence of the surface silicate groups, which also results in an increase in the methane selectivity, a decrease in the olefin content and a decrease in formation of branched product compounds. DA - 2012 DB - OpenUCT DP - University of Cape Town J1 - Journal of Catalysis LK - https://open.uct.ac.za PB - University of Cape Town PY - 2012 SM - 0021-9517 T1 - Strong-metal–support interaction by molecular design: Fe–silicate interactions in Fischer–Tropsch catalysts TI - Strong-metal–support interaction by molecular design: Fe–silicate interactions in Fischer–Tropsch catalysts UR - http://hdl.handle.net/11427/20758 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/20758
dc.identifier.vancouvercitationMogorosi RP, Fischer N, Claeys M, van Steen E. Strong-metal–support interaction by molecular design: Fe–silicate interactions in Fischer–Tropsch catalysts. Journal of Catalysis. 2012; http://hdl.handle.net/11427/20758.en_ZA
dc.languageengen_ZA
dc.publisherElsevieren_ZA
dc.publisher.institutionUniversity of Cape Town
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)*
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/en_ZA
dc.sourceJournal of Catalysisen_ZA
dc.source.urihttp://www.sciencedirect.com/science/journal/00219517
dc.subject.otherMetal–support interactions
dc.subject.otherIron
dc.subject.otherSilica
dc.subject.otherFischer–Tropsch
dc.subject.otherActivity
dc.subject.otherSelectivity
dc.titleStrong-metal–support interaction by molecular design: Fe–silicate interactions in Fischer–Tropsch catalystsen_ZA
dc.typeJournal Articleen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceArticleen_ZA
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