Influence of the Defect Concentration of Ceria on the Pt Dispersion and the CO Oxidation Activity of Pt/CeO2

Jaeha Lee; Youngseok Ryou; Jonghyun Kim; Xiaojun Chan; Tae Jin Kim; Do Heui Kim

doi:10.1021/acs.jpcc.8b00254

Influence of the Defect Concentration of Ceria on the Pt Dispersion and the CO Oxidation Activity of Pt/CeO₂

Jaeha Lee, Youngseok Ryou, Jonghyun Kim, Xiaojun Chan, Tae Jin Kim, Do Heui Kim

Department of Applied Chemistry

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

69 Scopus citations

Abstract

The CO oxidation ability can be modulated by controlling the metal-support interaction of Pt/CeO₂ catalysts. The Pt/(800C)CeO₂ sample prepared by the thermal treatment of ceria at 800 °C before loading Pt maintained the much higher Pt dispersion than Pt/γ-Al₂O₃ after the thermal aging at 800 °C, indicating its excellent thermal resistance against Pt sintering. In addition, the CO oxidation rate of the Pt/(800C)CeO₂ catalyst was order of magnitude higher than that of the Pt/CeO₂ catalyst. Such enhanced activity is explained by the weakened Pt-ceria interaction in Pt/(800C)CeO₂, which is evidenced by the formation of PtO₂ species that interact weakly with ceria rather than that of Pt-O-Ce species interacting strongly with ceria. The presence of PtO₂ species appears to be essential for the high CO oxidation ability.

Original language	English
Pages (from-to)	4972-4983
Number of pages	12
Journal	Journal of Physical Chemistry C
Volume	122
Issue number	9
DOIs	https://doi.org/10.1021/acs.jpcc.8b00254
State	Published - 8 Mar 2018

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title = "Influence of the Defect Concentration of Ceria on the Pt Dispersion and the CO Oxidation Activity of Pt/CeO2",

abstract = "The CO oxidation ability can be modulated by controlling the metal-support interaction of Pt/CeO2 catalysts. The Pt/(800C)CeO2 sample prepared by the thermal treatment of ceria at 800 °C before loading Pt maintained the much higher Pt dispersion than Pt/γ-Al2O3 after the thermal aging at 800 °C, indicating its excellent thermal resistance against Pt sintering. In addition, the CO oxidation rate of the Pt/(800C)CeO2 catalyst was order of magnitude higher than that of the Pt/CeO2 catalyst. Such enhanced activity is explained by the weakened Pt-ceria interaction in Pt/(800C)CeO2, which is evidenced by the formation of PtO2 species that interact weakly with ceria rather than that of Pt-O-Ce species interacting strongly with ceria. The presence of PtO2 species appears to be essential for the high CO oxidation ability.",

author = "Jaeha Lee and Youngseok Ryou and Jonghyun Kim and Xiaojun Chan and Kim, {Tae Jin} and Kim, {Do Heui}",

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T1 - Influence of the Defect Concentration of Ceria on the Pt Dispersion and the CO Oxidation Activity of Pt/CeO2

AU - Lee, Jaeha

AU - Ryou, Youngseok

AU - Kim, Jonghyun

AU - Chan, Xiaojun

AU - Kim, Tae Jin

AU - Kim, Do Heui

PY - 2018/3/8

Y1 - 2018/3/8

N2 - The CO oxidation ability can be modulated by controlling the metal-support interaction of Pt/CeO2 catalysts. The Pt/(800C)CeO2 sample prepared by the thermal treatment of ceria at 800 °C before loading Pt maintained the much higher Pt dispersion than Pt/γ-Al2O3 after the thermal aging at 800 °C, indicating its excellent thermal resistance against Pt sintering. In addition, the CO oxidation rate of the Pt/(800C)CeO2 catalyst was order of magnitude higher than that of the Pt/CeO2 catalyst. Such enhanced activity is explained by the weakened Pt-ceria interaction in Pt/(800C)CeO2, which is evidenced by the formation of PtO2 species that interact weakly with ceria rather than that of Pt-O-Ce species interacting strongly with ceria. The presence of PtO2 species appears to be essential for the high CO oxidation ability.

AB - The CO oxidation ability can be modulated by controlling the metal-support interaction of Pt/CeO2 catalysts. The Pt/(800C)CeO2 sample prepared by the thermal treatment of ceria at 800 °C before loading Pt maintained the much higher Pt dispersion than Pt/γ-Al2O3 after the thermal aging at 800 °C, indicating its excellent thermal resistance against Pt sintering. In addition, the CO oxidation rate of the Pt/(800C)CeO2 catalyst was order of magnitude higher than that of the Pt/CeO2 catalyst. Such enhanced activity is explained by the weakened Pt-ceria interaction in Pt/(800C)CeO2, which is evidenced by the formation of PtO2 species that interact weakly with ceria rather than that of Pt-O-Ce species interacting strongly with ceria. The presence of PtO2 species appears to be essential for the high CO oxidation ability.

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JO - Journal of Physical Chemistry C

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Influence of the Defect Concentration of Ceria on the Pt Dispersion and the CO Oxidation Activity of Pt/CeO₂

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