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dc.contributor.authorDam, Anh Hoang
dc.contributor.authorWang, Hongmin
dc.contributor.authorDehghan-Niri, Roya
dc.contributor.authorYu, Xiaofeng
dc.contributor.authorWalmsley, John
dc.contributor.authorHolmen, Anders
dc.contributor.authorYang, Jia
dc.contributor.authorChen, De
dc.date.accessioned2020-07-07T08:25:38Z
dc.date.available2020-07-07T08:25:38Z
dc.date.created2019-09-13T17:43:00Z
dc.date.issued2019
dc.identifier.citationChemCatChem. 2019, 11 (15), 3401-3412.en_US
dc.identifier.issn1867-3880
dc.identifier.urihttps://hdl.handle.net/11250/2660908
dc.description.abstractThe paper presents a fundamental study of the properties and functions of well‐defined Ni−Ag surface alloys in methane decomposition and steam reforming, aiming at providing a better understanding of the principle for manipulating the catalytic activity of steam reforming and suppressing carbon formation. A better insight of structure‐property relationship was obtained by a kinetic study of the reactions on well‐defined surface Ni−Ag alloys, which were synthesized by surface redox reaction to selectively introduce Ag atoms into the surface of Ni particles supported on hydrotalcite derived support. The effects of Ni surface alloy with Ag are three‐folds in general. Replacement of Ni by Ag reduces the number of active site exponentially with increasing Ag site coverage. Ag site is not only inactive, but also significantly reduces the activity of adjacent Ni sites for methane activation in both methane decomposition and steam reforming. The third effect is to block the active sites for the nucleation and growth of the filamentous carbon. The rate of methane activation at Ni step sites was found to be 16–19 times of that on Ni terrace sites. The carbon formation rate decreased linearly with Ag site coverage and the effect of Ag is divided into two regions. At low Ag site coverages (0 to 0.055), Ag atoms preferentially deposit on Ni step sites, which has a significant effect on the methane activation compared to Ag atoms on the Ni terrace sites. The results reveal that the effects of Ag site on the carbon formation in the two regions are mostly caused by the different effects of Ag on the activity of Ni step sites and terrace sites, respectively, rather than the different ensemble sizes for carbon formation proposed in the literature.en_US
dc.language.isoengen_US
dc.publisherWileyen_US
dc.titleMethane activation on bimetallic catalysts: properties and functions of surface Ni-Ag alloyen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionpublishedVersionen_US
dc.source.pagenumber3401-3412en_US
dc.source.volume11en_US
dc.source.journalChemCatChemen_US
dc.source.issue15en_US
dc.identifier.doi10.1002/cctc.201900679
dc.identifier.cristin1724608
dc.relation.projectNorges forskningsråd: 237922en_US
dc.relation.projectNORTEM: 197405en_US
dc.description.localcodeThis article will not be available due to copyright restrictions (c) 2019 by Wileyen_US
cristin.unitcode194,66,30,0
cristin.unitcode194,66,20,0
cristin.unitnameInstitutt for kjemisk prosessteknologi
cristin.unitnameInstitutt for fysikk
cristin.ispublishedtrue
cristin.fulltextpreprint
cristin.qualitycode1


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