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Article

Oxidative Thermal Sintering and Redispersion of Rh Nanoparticles on Supports with High Oxygen Ion Lability

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Laboratory of Physical Chemistry & Chemical Processes (www.pccplab.tuc.gr), School of Environmental Engineering, Technical University of Crete, GR-73100 Chania, Greece
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European Bioenergy Research Institute, Aston University, Aston Triangle, Birmingham B4 7ET, UK
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The School of Chemical Engineering and Analytical Science, The University of Manchester, Manchester M13 9PL, UK
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Diamond Light Source, Harwell Campus, The University of Manchester at Harwell, Didcot OX11 0DE, UK
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Department of Chemical Engineering, University of Patras, GR-26500 Patras, Greece
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Department of Chemistry, Cambridge University, Cambridge CB2 1EW, UK
*
Author to whom correspondence should be addressed.
Catalysts 2019, 9(6), 541; https://doi.org/10.3390/catal9060541
Received: 21 May 2019 / Revised: 10 June 2019 / Accepted: 11 June 2019 / Published: 17 June 2019
(This article belongs to the Special Issue Nanomaterials in Catalysis Applications)
The 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-Al2O3 (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). View Full-Text
Keywords: rhodium; alumina ceria zirconia; nanoparticles sintering; redispersion; oxygen storage capacity; atom trapping; Ostwald ripening; particle migration and coalescence; metal–support interactions rhodium; alumina ceria zirconia; nanoparticles sintering; redispersion; oxygen storage capacity; atom trapping; Ostwald ripening; particle migration and coalescence; metal–support interactions
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MDPI and ACS Style

Goula, G.; Botzolaki, G.; Osatiashtiani, A.; Parlett, C.M.A.; Kyriakou, G.; Lambert, R.M.; Yentekakis, I.V. Oxidative Thermal Sintering and Redispersion of Rh Nanoparticles on Supports with High Oxygen Ion Lability. Catalysts 2019, 9, 541. https://doi.org/10.3390/catal9060541

AMA Style

Goula G, Botzolaki G, Osatiashtiani A, Parlett CMA, Kyriakou G, Lambert RM, Yentekakis IV. Oxidative Thermal Sintering and Redispersion of Rh Nanoparticles on Supports with High Oxygen Ion Lability. Catalysts. 2019; 9(6):541. https://doi.org/10.3390/catal9060541

Chicago/Turabian Style

Goula, Grammatiki, Georgia Botzolaki, Amin Osatiashtiani, Christopher M.A. Parlett, Georgios Kyriakou, Richard M. Lambert, and Ioannis V. Yentekakis 2019. "Oxidative Thermal Sintering and Redispersion of Rh Nanoparticles on Supports with High Oxygen Ion Lability" Catalysts 9, no. 6: 541. https://doi.org/10.3390/catal9060541

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