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dc.contributor.authorPena, Diego
dc.contributor.authorJensen, Lise Saue
dc.contributor.authorCognigni, Andrea
dc.contributor.authorMyrstad, Rune
dc.contributor.authorNeumayer, Thomas
dc.contributor.authorVan Beek, Wouter
dc.contributor.authorRønning, Magnus
dc.date.accessioned2018-04-05T13:19:33Z
dc.date.available2018-04-05T13:19:33Z
dc.date.created2018-03-26T11:55:16Z
dc.date.issued2018
dc.identifier.citationChemCatChem. 2018, 10 (6), 1300-1312.nb_NO
dc.identifier.issn1867-3880
dc.identifier.urihttp://hdl.handle.net/11250/2492901
dc.description.abstractThe effect of copper as promoter on iron carbide formation and the nature of surface species on iron‐based catalyst during Fischer–Tropsch synthesis (FTS) was investigated. Iron‐based catalysts (15 wt % of Fe) supported on alumina promoted with copper (0, 0.6, 2, and 5 wt %) were characterised in situ at relevant FTS conditions. The catalysts promoted with 2 and 5 wt % of Cu showed higher catalytic activity due to the formation of Hägg carbide (Fe5C2) detected by in situ XANES and XRD. The carbide formation is attributed to a weakening of the iron–alumina mixed‐compound interactions, and hence increasing iron reducibility and dispersion. The in situ XANES measurements indicated a maximum carburization degree (ca. 20–22 %) even at high Cu loading. The catalyst promoted with 5 wt % of Cu exhibited higher water‐gas shift activity. Aliphatic hydrocarbons, formate, and carboxylate species were detected on the catalyst surface during FTS. After exposing the spent catalysts to hydrogenation conditions, the carboxylate species remained strongly adsorbed while aliphatic hydrocarbons and formate species disappeared. The accumulation of oxygenates species on the catalyst surface increased with Cu loading. The interaction of oxygenates with alumina and iron oxide particles (FexOy) were revealed, with the latter being a possible reason for inhibition of further iron carburization.nb_NO
dc.language.isoengnb_NO
dc.publisherWileynb_NO
dc.titleThe Effect of Copper Loading on Iron Carbide Formation and Surface Species in Iron‐Based Fischer–Tropsch Synthesis Catalystsnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.source.pagenumber1300-1312nb_NO
dc.source.volume10nb_NO
dc.source.journalChemCatChemnb_NO
dc.source.issue6nb_NO
dc.identifier.doi10.1002/cctc.201701673
dc.identifier.cristin1575695
dc.relation.projectEC/FP7/604277nb_NO
dc.relation.projectNorges forskningsråd: 218406nb_NO
dc.relation.projectNorges forskningsråd: 244069nb_NO
dc.relation.projectNorges forskningsråd: 197405nb_NO
dc.description.localcodeThis is the peer reviewed version of the following article: [The Effect of Copper Loading on Iron Carbide Formation and Surface Species in Iron‐Based Fischer–Tropsch Synthesis Catalysts], which has been published in final form at [https://onlinelibrary.wiley.com/doi/abs/10.1002/cctc.201701673]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving. Locked until 1.12.2018 due to copyright restrictions.nb_NO
cristin.unitcode194,66,30,0
cristin.unitnameInstitutt for kjemisk prosessteknologi
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode1


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