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Understanding the CO oxidation on Pt nanoparticles supported on MOFs by operando XPS

Understanding the CO oxidation on Pt nanoparticles supported on MOFs by operando XPS
Understanding the CO oxidation on Pt nanoparticles supported on MOFs by operando XPS

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.

CO Oxidation, Confinement Effect, Metal-Organic Frameworks (MOFs), Operando Near Ambient Pressure XPS (NAP-XPS), Pt Catalysts
1867-3880
4238-4242
Vakili, Reza
7e37d2f5-ccc7-4530-9b77-898141c35ab2
Gibson, Emma K.
738c74e4-ab68-42fe-bda8-9d4a43669b31
Chansai, Sarayute
faaebf22-0868-44e5-856e-f5bb2c5e51ab
Xu, Shaojun
aa16ac6c-5344-4273-a62e-755756b868e1
Al-Janabi, Nadeen
37f6244f-6861-4919-b31f-ff8d2ac0e029
Wells, Peter P.
bc4fdc2d-a490-41bf-86cc-400edecf2266
Hardacre, Christopher
0715f59a-c82e-4844-a9f8-6a06fb36320f
Walton, Alex
63f8b25b-0021-4106-84cb-7e730561b0c7
Fan, Xiaolei
a4502a12-4d96-4afb-b171-5c194ae3c98f
Vakili, Reza
7e37d2f5-ccc7-4530-9b77-898141c35ab2
Gibson, Emma K.
738c74e4-ab68-42fe-bda8-9d4a43669b31
Chansai, Sarayute
faaebf22-0868-44e5-856e-f5bb2c5e51ab
Xu, Shaojun
aa16ac6c-5344-4273-a62e-755756b868e1
Al-Janabi, Nadeen
37f6244f-6861-4919-b31f-ff8d2ac0e029
Wells, Peter P.
bc4fdc2d-a490-41bf-86cc-400edecf2266
Hardacre, Christopher
0715f59a-c82e-4844-a9f8-6a06fb36320f
Walton, Alex
63f8b25b-0021-4106-84cb-7e730561b0c7
Fan, Xiaolei
a4502a12-4d96-4afb-b171-5c194ae3c98f

Vakili, Reza, Gibson, Emma K., Chansai, Sarayute, Xu, Shaojun, Al-Janabi, Nadeen, Wells, Peter P., Hardacre, Christopher, Walton, Alex and Fan, Xiaolei (2018) Understanding the CO oxidation on Pt nanoparticles supported on MOFs by operando XPS. ChemCatChem, 10 (19), 4238-4242. (doi:10.1002/cctc.201801067).

Record type: Article

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.

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More information

Accepted/In Press date: 20 July 2018
e-pub ahead of print date: 20 July 2018
Published date: 9 October 2018
Keywords: CO Oxidation, Confinement Effect, Metal-Organic Frameworks (MOFs), Operando Near Ambient Pressure XPS (NAP-XPS), Pt Catalysts

Identifiers

Local EPrints ID: 425589
URI: http://eprints.soton.ac.uk/id/eprint/425589
ISSN: 1867-3880
PURE UUID: 2e23c26c-bf9d-4608-b6fb-3886f4826264
ORCID for Peter P. Wells: ORCID iD orcid.org/0000-0002-0859-9172

Catalogue record

Date deposited: 25 Oct 2018 16:30
Last modified: 16 Mar 2024 03:47

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Contributors

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

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