dc.contributor.author | Svenum, Ingeborg-Helene | |
dc.contributor.author | Strømsheim, Marie D. | |
dc.contributor.author | Knudsen, Jan | |
dc.contributor.author | Venvik, Hilde Johnsen | |
dc.date.accessioned | 2023-02-03T09:02:08Z | |
dc.date.available | 2023-02-03T09:02:08Z | |
dc.date.created | 2023-01-23T16:26:11Z | |
dc.date.issued | 2022 | |
dc.identifier.citation | Journal of Catalysis. 2022, 417 194-201. | en_US |
dc.identifier.issn | 0021-9517 | |
dc.identifier.uri | https://hdl.handle.net/11250/3048188 | |
dc.description.abstract | The surface reactivity during CO oxidation over Pd(1 1 1) and Pd75%Ag25%(1 1 1) single crystals has been investigated using near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) under excess oxygen conditions (p ≈ 2 mbar, O2:CO=10). The (√6×√6) Pd5O4 surface oxide is present on Pd(1 1 1) when the surface is highly active under the applied conditions. The CO2 formation profile follows a hysteresis upon temperature cycling between 150 and 450 °C that depends on the temperature ramp rate. The behavior is different for Pd75%Ag25%(1 1 1), with the CO2 formation rate considerably lower, no surface oxide and only chemisorbed oxygen present at the surface at high temperature, reversible scrambling of the (near) surface Pd/(Pd+Ag) ratio, and no hysteresis behavior observed. The results suggest that the reactant activation is affected by both surface composition and surface termination, i.e. mechanistically different on Pd75%Ag25%(1 1 1) than Pd(1 1 1), and less efficient on (1 1 1) as compared to the (1 0 0) alloy counterpart. | en_US |
dc.language.iso | eng | en_US |
dc.publisher | Elsevier | en_US |
dc.rights | Navngivelse 4.0 Internasjonal | * |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/deed.no | * |
dc.subject | Funksjonelle materialer | en_US |
dc.subject | Functional materials | en_US |
dc.subject | Heterogen katalyse | en_US |
dc.subject | Heterogeneous Catalysis | en_US |
dc.subject | Overflatekjemi | en_US |
dc.subject | Surface chemistry | en_US |
dc.subject | Oksidasjon | en_US |
dc.subject | Oxidation | en_US |
dc.title | Activity and segregation behavior of Pd75%Ag25%(1 1 1) during CO oxidation – An in situ NAP-XPS investigation | en_US |
dc.title.alternative | Activity and segregation behavior of Pd75%Ag25%(1 1 1) during CO oxidation – An in situ NAP-XPS investigation | en_US |
dc.type | Peer reviewed | en_US |
dc.type | Journal article | en_US |
dc.description.version | publishedVersion | en_US |
dc.rights.holder | Copyright: 2022 The Author(s). Published by Elsevier Inc | en_US |
dc.subject.nsi | VDP::Kjemisk prosessteknologi: 562 | en_US |
dc.subject.nsi | VDP::Chemical process engineering: 562 | en_US |
dc.source.pagenumber | 194-201 | en_US |
dc.source.volume | 417 | en_US |
dc.source.journal | Journal of Catalysis | en_US |
dc.identifier.doi | 10.1016/j.jcat.2022.11.038 | |
dc.identifier.cristin | 2113515 | |
dc.relation.project | Norges forskningsråd: 280903 | en_US |
dc.relation.project | Vetenskapsrådet: 2018-07152 | en_US |
dc.relation.project | Vetenskapsrådet: 2017-04840 | en_US |
dc.relation.project | Norges forskningsråd: 237922 | en_US |
dc.relation.project | VINNOVA: 2018-04969 | en_US |
cristin.ispublished | true | |
cristin.fulltext | original | |
cristin.qualitycode | 2 | |