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

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) , pp. 4238-4242. 10.1002/cctc.201801067

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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Additional Information: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Publisher: Wiley
ISSN: 1867-3880
Date of First Compliant Deposit: 10 March 2021
Date of Acceptance: 20 July 2018
Last Modified: 12 Mar 2021 11:45
URI: http://orca.cardiff.ac.uk/id/eprint/139461

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