Oxidative thermal sintering and redispersion of Rh nanoparticles on supports with high oxygen ion labilityOxidative thermal sintering and redispersion of Rh nanoparticles on supports with high oxygen ion lability Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2020-06-102019enThe 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).http://creativecommons.org/licenses/by/4.0/Catalysts96Goula_et_al_Catalysts_9(6)_2019.pdfChania [Greece]Library of TUC2020-06-07application/pdf3.2 MBfree Goula Grammatiki Γουλα Γραμματικη Botzolaki Georgia Μποτζολακη Γεωργια Osatiashtiani Amin Parlett Christopher M.A. Kyriakou Georgios Lambert Richard M. Gentekakis Ioannis Γεντεκακης Ιωαννης MDPI Alumina ceria zirconia Atom trapping Metal-support interactions Nanoparticles sintering Ostwald ripening Oxygen storage capacity Particle migration and coalescence Redispersion Rhodium