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

Vakili, R., Gibson, E. K. , Chansai, S., Xu, S., Al-Janabi, N., Wells, P. P., Hardacre, C., Walton, A. and Fan, X. (2018) Understanding the CO oxidation on Pt nanoparticles supported on MOFs by operando XPS. ChemCatChem, 10(19), pp. 4238-4242. (doi: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:Articles
Keywords:Physical and theoretical chemistry, inorganic chemistry, organic chemistry, catalysis
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Gibson, Dr Emma
Authors: Vakili, R., Gibson, E. K., Chansai, S., Xu, S., Al-Janabi, N., Wells, P. P., Hardacre, C., Walton, A., and Fan, X.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:ChemCatChem
Publisher:Wiley
ISSN:1867-3880
ISSN (Online):1867-3899
Published Online:13 August 2018
Copyright Holders:Copyright © 2018 Wiley-VCH GmbH & Co. KGaA, Weinheim
First Published:First published in ChemCatChem 10(19): 4238-4242
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
654181Catalytic HDO (UK Catalysis hub)Samuel JacksonEngineering and Physical Sciences Research Council (EPSRC)EP/K014706/1CHEM - CHEMISTRY
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557001Catalytic Science in the Harwell Research CentreDavid LennonEngineering and Physical Sciences Research Council (EPSRC)EP/I019693/1CHEM - CHEMISTRY