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

Grammatiki Goula; Georgia Botzolaki; Amin Osatiashtiani; Christopher M. A. Parlett; Georgios Kyriakou; Richard M. Lambert; Ioannis V. Yentekakis

doi:10.3390/catal9060541

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

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

Research output: Contribution to journal › Article › peer-review

Abstract

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).

Original language	English
Journal	Catalysts
Volume	9
Issue number	6
DOIs	https://doi.org/10.3390/catal9060541
Publication status	Published - 17 Jun 2019

Keywords

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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10.3390/catal9060541

UoMaH: The University of Manchester at Harwell
Lawrence, J. (PI), Burnett, T. (PI), Baker, M. (Researcher), Eastwood, D. (Researcher), Hunt, S. (Researcher), Yan, K. (Researcher), Khan, A. (Researcher), Ma, L. (Researcher), Mirihanage, W. (Researcher), Mu, T. (Researcher), Parlett, C. (Researcher), Price, C. (Researcher), Freitas, D. (Researcher), Bourne, N. (Researcher), Reinhard, C. (Support team), Lewis-Fell, J. (Technical team), Nonni, S. (Technical team), Rollings, B. (Technical team), Sinclair, L. (Technical team) & Batts, S. (Support team)
1/01/18 → …
Project: Other

Cite this

@article{cb2c4a3243554d88baafa9d918cb1954,

title = "Oxidative Thermal Sintering and Redispersion of Rh Nanoparticles on Supports with High Oxygen Ion Lability",

abstract = "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).",

keywords = "rhodium, alumina ceria zirconia, nanoparticles sintering, redispersion, oxygen storage capacity, atom trapping, Ostwald ripening, particle migration and coalescence, metal-support interactions",

author = "Grammatiki Goula and Georgia Botzolaki and Amin Osatiashtiani and Parlett, {Christopher M. A.} and Georgios Kyriakou and Lambert, {Richard M.} and Yentekakis, {Ioannis V.}",

year = "2019",

month = jun,

day = "17",

doi = "10.3390/catal9060541",

language = "English",

volume = "9",

journal = "Catalysts",

issn = "2073-4344",

publisher = "MDPI",

number = "6",

}

TY - JOUR

T1 - Oxidative Thermal Sintering and Redispersion of Rh Nanoparticles on Supports with High Oxygen Ion Lability

AU - Goula, Grammatiki

AU - Botzolaki, Georgia

AU - Osatiashtiani, Amin

AU - Parlett, Christopher M. A.

AU - Kyriakou, Georgios

AU - Lambert, Richard M.

AU - Yentekakis, Ioannis V.

PY - 2019/6/17

Y1 - 2019/6/17

N2 - 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).

AB - 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).

KW - rhodium

KW - alumina ceria zirconia

KW - nanoparticles sintering

KW - redispersion

KW - oxygen storage capacity

KW - atom trapping

KW - Ostwald ripening

KW - particle migration and coalescence

KW - metal-support interactions

U2 - 10.3390/catal9060541

DO - 10.3390/catal9060541

M3 - Article

SN - 2073-4344

VL - 9

JO - Catalysts

JF - Catalysts

IS - 6

ER -

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

Abstract

Keywords

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UoMaH: The University of Manchester at Harwell

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