Understanding the CO Oxidation on Pt Nanoparticles Supported on MOFs by Operando XPS

Reza Vakili; Emma K. Gibson; Sarayute Chansai; Shaojun Xu; Nadeen Al-Janabi; Peter P. Wells; Christopher Hardacre; Alex Walton; Xiaolei Fan

doi:10.1002/cctc.201801067

Understanding the CO Oxidation on Pt Nanoparticles Supported on MOFs by Operando XPS

Reza Vakili, Emma K. Gibson, Sarayute Chansai, Shaojun Xu, Nadeen Al-Janabi, Peter P. Wells, Christopher Hardacre, Alex Walton, Xiaolei Fan

Research output: Journal Publication › Article › peer-review

35 Citations (Scopus)

Abstract

Metal-organic frameworks (MOFs) are playing a key role in developing the next generation of heterogeneous catalysts. In this work, near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) is applied to study in operando the CO oxidation on Pt@MOFs (UiO-67) and Pt@ZrO₂ catalysts, revealing the same Pt surface dynamics under the stoichiometric CO/O₂ ambient at 3 mbar. Upon the ignition at ca. 200 °C, the signature Pt binding energy (BE) shift towards the lower BE (from 71.8 to 71.2 eV) is observed for all catalysts, confirming metallic Pt nanoparticles (NPs) as the active phase. Additionally, the plug-flow light-off experiments show the superior activity of the Pt@MOFs catalyst in CO oxidation than the control Pt@ZrO₂ catalyst with ca. 28 % drop in the T_50% light-off temperature, as well as high stability, due to their sintering-resistance feature. These results provide evidence that the uniqueness of MOFs as the catalyst supports lies in the structural confinement effect.

Original language	English
Pages (from-to)	4238-4242
Number of pages	5
Journal	ChemCatChem
Volume	10
Issue number	19
DOIs	https://doi.org/10.1002/cctc.201801067
Publication status	Published - 9 Oct 2018
Externally published	Yes

Keywords

CO Oxidation
Confinement Effect
Metal-Organic Frameworks (MOFs)
Operando Near Ambient Pressure XPS (NAP-XPS)
Pt Catalysts

ASJC Scopus subject areas

Catalysis
Physical and Theoretical Chemistry
Organic Chemistry
Inorganic Chemistry

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10.1002/cctc.201801067

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title = "Understanding the CO Oxidation on Pt Nanoparticles Supported on MOFs by Operando XPS",

abstract = "Metal-organic frameworks (MOFs) are playing a key role in developing the next generation of heterogeneous catalysts. In this work, near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) is applied to study in operando the CO oxidation on Pt@MOFs (UiO-67) and Pt@ZrO2 catalysts, revealing the same Pt surface dynamics under the stoichiometric CO/O2 ambient at 3 mbar. Upon the ignition at ca. 200 °C, the signature Pt binding energy (BE) shift towards the lower BE (from 71.8 to 71.2 eV) is observed for all catalysts, confirming metallic Pt nanoparticles (NPs) as the active phase. Additionally, the plug-flow light-off experiments show the superior activity of the Pt@MOFs catalyst in CO oxidation than the control Pt@ZrO2 catalyst with ca. 28 % drop in the T50% light-off temperature, as well as high stability, due to their sintering-resistance feature. These results provide evidence that the uniqueness of MOFs as the catalyst supports lies in the structural confinement effect.",

keywords = "CO Oxidation, Confinement Effect, Metal-Organic Frameworks (MOFs), Operando Near Ambient Pressure XPS (NAP-XPS), Pt Catalysts",

author = "Reza Vakili and Gibson, {Emma K.} and Sarayute Chansai and Shaojun Xu and Nadeen Al-Janabi and Wells, {Peter P.} and Christopher Hardacre and Alex Walton and Xiaolei Fan",

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year = "2018",

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doi = "10.1002/cctc.201801067",

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AU - Vakili, Reza

AU - Gibson, Emma K.

AU - Chansai, Sarayute

AU - Xu, Shaojun

AU - Al-Janabi, Nadeen

AU - Wells, Peter P.

AU - Hardacre, Christopher

AU - Walton, Alex

AU - Fan, Xiaolei

PY - 2018/10/9

Y1 - 2018/10/9

N2 - Metal-organic frameworks (MOFs) are playing a key role in developing the next generation of heterogeneous catalysts. In this work, near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) is applied to study in operando the CO oxidation on Pt@MOFs (UiO-67) and Pt@ZrO2 catalysts, revealing the same Pt surface dynamics under the stoichiometric CO/O2 ambient at 3 mbar. Upon the ignition at ca. 200 °C, the signature Pt binding energy (BE) shift towards the lower BE (from 71.8 to 71.2 eV) is observed for all catalysts, confirming metallic Pt nanoparticles (NPs) as the active phase. Additionally, the plug-flow light-off experiments show the superior activity of the Pt@MOFs catalyst in CO oxidation than the control Pt@ZrO2 catalyst with ca. 28 % drop in the T50% light-off temperature, as well as high stability, due to their sintering-resistance feature. These results provide evidence that the uniqueness of MOFs as the catalyst supports lies in the structural confinement effect.

AB - Metal-organic frameworks (MOFs) are playing a key role in developing the next generation of heterogeneous catalysts. In this work, near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) is applied to study in operando the CO oxidation on Pt@MOFs (UiO-67) and Pt@ZrO2 catalysts, revealing the same Pt surface dynamics under the stoichiometric CO/O2 ambient at 3 mbar. Upon the ignition at ca. 200 °C, the signature Pt binding energy (BE) shift towards the lower BE (from 71.8 to 71.2 eV) is observed for all catalysts, confirming metallic Pt nanoparticles (NPs) as the active phase. Additionally, the plug-flow light-off experiments show the superior activity of the Pt@MOFs catalyst in CO oxidation than the control Pt@ZrO2 catalyst with ca. 28 % drop in the T50% light-off temperature, as well as high stability, due to their sintering-resistance feature. These results provide evidence that the uniqueness of MOFs as the catalyst supports lies in the structural confinement effect.

KW - CO Oxidation

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KW - Operando Near Ambient Pressure XPS (NAP-XPS)

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Understanding the CO Oxidation on Pt Nanoparticles Supported on MOFs by Operando XPS

Abstract

Keywords

ASJC Scopus subject areas

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