Room-Temperature CO Oxidation Catalyst: Low-Temperature Metal-Support Interaction between Platinum Nanoparticles and Nanosized Ceria

Suresh Gatla; Daniel Aubert; Giovanni Agostini; Olivier Mathon; Sakura Pascarelli; Thomas Lunkenbein; Marc Georg Willinger; Helena Kaper

doi:10.1021/acscatal.6b00677

Room-Temperature CO Oxidation Catalyst: Low-Temperature Metal-Support Interaction between Platinum Nanoparticles and Nanosized Ceria

Suresh Gatla, Daniel Aubert, Giovanni Agostini, Olivier Mathon, Sakura Pascarelli, Thomas Lunkenbein, Marc Georg Willinger, Helena Kaper

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

147 Scopus citations

Abstract

Platinum nanoparticles dispersed on nanosized ceria are active for CO oxidation at room temperature after hydrogen pretreatment. High angular annular dark field scanning transmission electron microscopy (HAADF-STEM) analysis of the reduced catalyst shows spreading of the 1 nm sized platinum particles under the electron beam, characteristic for a two-dimensional strong metal-support interaction. In situ X-ray absorption fluorescence spectroscopy (XAFS) reveals a Pt-O distance of 2.1 Å, which is significantly longer than the Pt-O distance in PtO₂ (2.0 Å). This elongated Pt-O distance can be related to interaction of the platinum species with cerium oxide in the form of a low-temperature active species-support interaction. These findings contribute to the general understanding of catalytic systems operating at low temperature.

Original language	English
Pages (from-to)	6151-6155
Number of pages	5
Journal	ACS Catalysis
Volume	6
Issue number	9
DOIs	https://doi.org/10.1021/acscatal.6b00677
State	Published - 2 Sep 2016
Externally published	Yes

Keywords

CO oxidation
heterogeneous catalysis
in situ X-ray absorption spectroscopy
metal-support interaction
platinum cerium oxide catalyst

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10.1021/acscatal.6b00677

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title = "Room-Temperature CO Oxidation Catalyst: Low-Temperature Metal-Support Interaction between Platinum Nanoparticles and Nanosized Ceria",

abstract = "Platinum nanoparticles dispersed on nanosized ceria are active for CO oxidation at room temperature after hydrogen pretreatment. High angular annular dark field scanning transmission electron microscopy (HAADF-STEM) analysis of the reduced catalyst shows spreading of the 1 nm sized platinum particles under the electron beam, characteristic for a two-dimensional strong metal-support interaction. In situ X-ray absorption fluorescence spectroscopy (XAFS) reveals a Pt-O distance of 2.1 {\AA}, which is significantly longer than the Pt-O distance in PtO2 (2.0 {\AA}). This elongated Pt-O distance can be related to interaction of the platinum species with cerium oxide in the form of a low-temperature active species-support interaction. These findings contribute to the general understanding of catalytic systems operating at low temperature.",

keywords = "CO oxidation, heterogeneous catalysis, in situ X-ray absorption spectroscopy, metal-support interaction, platinum cerium oxide catalyst",

author = "Suresh Gatla and Daniel Aubert and Giovanni Agostini and Olivier Mathon and Sakura Pascarelli and Thomas Lunkenbein and Willinger, {Marc Georg} and Helena Kaper",

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doi = "10.1021/acscatal.6b00677",

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AU - Gatla, Suresh

AU - Aubert, Daniel

AU - Agostini, Giovanni

AU - Mathon, Olivier

AU - Pascarelli, Sakura

AU - Lunkenbein, Thomas

AU - Willinger, Marc Georg

AU - Kaper, Helena

PY - 2016/9/2

Y1 - 2016/9/2

N2 - Platinum nanoparticles dispersed on nanosized ceria are active for CO oxidation at room temperature after hydrogen pretreatment. High angular annular dark field scanning transmission electron microscopy (HAADF-STEM) analysis of the reduced catalyst shows spreading of the 1 nm sized platinum particles under the electron beam, characteristic for a two-dimensional strong metal-support interaction. In situ X-ray absorption fluorescence spectroscopy (XAFS) reveals a Pt-O distance of 2.1 Å, which is significantly longer than the Pt-O distance in PtO2 (2.0 Å). This elongated Pt-O distance can be related to interaction of the platinum species with cerium oxide in the form of a low-temperature active species-support interaction. These findings contribute to the general understanding of catalytic systems operating at low temperature.

AB - Platinum nanoparticles dispersed on nanosized ceria are active for CO oxidation at room temperature after hydrogen pretreatment. High angular annular dark field scanning transmission electron microscopy (HAADF-STEM) analysis of the reduced catalyst shows spreading of the 1 nm sized platinum particles under the electron beam, characteristic for a two-dimensional strong metal-support interaction. In situ X-ray absorption fluorescence spectroscopy (XAFS) reveals a Pt-O distance of 2.1 Å, which is significantly longer than the Pt-O distance in PtO2 (2.0 Å). This elongated Pt-O distance can be related to interaction of the platinum species with cerium oxide in the form of a low-temperature active species-support interaction. These findings contribute to the general understanding of catalytic systems operating at low temperature.

KW - CO oxidation

KW - heterogeneous catalysis

KW - in situ X-ray absorption spectroscopy

KW - metal-support interaction

KW - platinum cerium oxide catalyst

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Room-Temperature CO Oxidation Catalyst: Low-Temperature Metal-Support Interaction between Platinum Nanoparticles and Nanosized Ceria

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Keywords

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