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Oxidative thermal sintering and redispersion of Rh nanoparticles on supports with high oxygen ion lability

Goula Grammatiki, Botzolaki Georgia, Osatiashtiani Amin, Parlett Christopher M.A., Kyriakou Georgios, Lambert Richard M., Gentekakis Ioannis

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URIhttp://purl.tuc.gr/dl/dias/7F7F5BC3-6EE2-4654-B70B-2AC6836F4B91-
Identifierhttps://doi.org/10.3390/catal9060541-
Identifierhttps://www.mdpi.com/2073-4344/9/6/541-
Languageen-
Extent16 pagesen
TitleOxidative thermal sintering and redispersion of Rh nanoparticles on supports with high oxygen ion labilityen
CreatorGoula Grammatikien
CreatorΓουλα Γραμματικηel
CreatorBotzolaki Georgiaen
CreatorΜποτζολακη Γεωργιαel
CreatorOsatiashtiani Aminen
CreatorParlett Christopher M.A.en
CreatorKyriakou Georgiosen
CreatorLambert Richard M.en
CreatorGentekakis Ioannisen
CreatorΓεντεκακης Ιωαννηςel
PublisherMDPIen
Content SummaryThe thermal sintering under oxidative conditions of Rh nanoparticles supported on oxides characterized by very different oxygen storage capacities (OSC) and labilities was studied at 750 and 850◦ C. Under sintering conditions, significant particle growth occurred for Rh/γ-Al2 O3 (up to 120% at 850◦ C). In striking contrast, Rh/ACZ (alumina–ceria–zirconia) and Rh/CZ (ceria–zirconia) exhibited marked resistance to sintering, and even moderate (ca. −10% at 850◦ C) to pronounced (ca. −60% at 850◦ C) redispersion of the Rh. A model is proposed based on a double-layer description of metal–support interactions assigned to back-spillover of labile oxygen ions onto the Rh particles, accompanied by trapping of atomic Rh by the resulting surface oxygen vacancies. This model accounts for the observed resistance to sintering and actual redispersion of Rh, consistent with both alternative sintering mechanisms, namely Ostwald ripening (OR) or particle migration and coalescence (PMC).en
Type of ItemPeer-Reviewed Journal Publicationen
Type of ItemΔημοσίευση σε Περιοδικό με Κριτέςel
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2020-06-10-
Date of Publication2019-
SubjectAlumina ceria zirconiaen
SubjectAtom trappingen
SubjectMetal-support interactionsen
SubjectNanoparticles sinteringen
SubjectOstwald ripeningen
SubjectOxygen storage capacityen
SubjectParticle migration and coalescenceen
SubjectRedispersionen
SubjectRhodiumen
Bibliographic CitationG. Goula, G. Botzolaki, A. Osatiashtiani, C.M.A. Parlett, G. Kyriakou, R.M. Lambert and I.V. Yentekakis, "Oxidative thermal sintering and redispersion of Rh nanoparticles on supports with high oxygen ion lability," Catalysts, vol. 9, no. 6, Jun. 2019. doi: 10.3390/catal9060541en

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