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Updated: Jan 26, 2026

Preparation of Nanoparticles for ToF-SIMS and XPS Analysis
Published on: September 13, 2020
Understanding the CO Oxidation on Pt Nanoparticles Supported on MOFs by Operando XPS
Reza Vakili1, Emma K Gibson2,3, Sarayute Chansai1
1School of Chemical Engineering and Analytical Science The University of Manchester Oxford Road Manchester M13 9PL UK.
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.
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