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dc.contributor.authorStrømsheim, Marie Døvre
dc.contributor.authorSvenum, Ingeborg-Helene
dc.contributor.authorFarstad, Mari Helene
dc.contributor.authorLi, Zheshen
dc.contributor.authorGavrilovic, Ljubisa
dc.contributor.authorGuo, Xiaoyang
dc.contributor.authorLervold, Stine
dc.contributor.authorBorg, Anne
dc.contributor.authorVenvik, Hilde Johnsen
dc.identifier.citationCatalysis Today. 2018, 299 37-46.nb_NO
dc.description.abstractThe location of potassium (K) on Cobalt (Co) and its effect on adsorption and adsorption-induced surface restructuring is important for understanding the deactivation of Co Fischer-Tropsch catalysts and the nature of the active surface. Co(11-20) restructures by anisotropic migration of Co atoms upon CO exposure. Deposition of sub-monolayer amounts of K on Co(11-20) and the effect on the CO-induced restructuring were therefore investigated using scanning tunneling microscopy (STM), high resolution photoemission spectroscopy (HR-PES), and density functional theory calculations (DFT). The combined STM and DFT results suggest that the preferred adsorption site for K at low coverage is in the vicinity of step edges. DFT also found that diffusion of K along the [0001] direction, in between the zigzag rows of the topmost Co layer is facile. The restructuring under CO exposure with K pre-adsorbed proceeded on the terraces rather than from the step edges, in a slower and more disordered manner. HR-PES showed that the amount of CO adsorbed at saturation significantly decreased with predeposited K. The obstructed migration of Co atoms across the surface may be important in understanding why very low amounts of K on supported Co catalysts significantly reduces the activity towards hydrogenation of CO.nb_NO
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internasjonal*
dc.titleEffects of K adsorption on the CO-induced restructuring of Co(11-20)nb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.rights.holderPostprint version of published article released under a CC-BY-ND-ND licensenb_NO
dc.source.journalCatalysis Todaynb_NO
dc.relation.projectNorges forskningsråd: 174893nb_NO
dc.relation.projectNotur/NorStore: NN9355knb_NO
dc.relation.projectNotur/NorStore: NTNU946nb_NO
dc.relation.projectNotur/NorStore: NN9152knb_NO
cristin.unitnameMaterialfysikk, Trh.

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Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal
Med mindre annet er angitt, så er denne innførselen lisensiert som Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal