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

DOI: 10.1002/cctc.201801067 DOI Help

Authors: Xiaolei Fan (The University of Manchester) , Reza Vakili (The University of Manchester) , Emma Gibson (University of Glasgow; UK Catalysis Hub) , Sarayute Chansai (The University of Manchester) , Shaojun Xu (The University of Manchester) , Peter Wells (University of Southampton) , Christopher Hardacre (The University of Manchester) , Alex Walton (The University of Manchester) , Nadeen Al-janabi (The University of Manchester)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Chemcatchem

State: Published (Approved)
Published: July 2018
Diamond Proposal Number(s): 8071

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.

Journal Keywords: Operando Near Ambient Pressure XPS (NAP-XPS); CO oxidation; Metal-organic frameworks (MOFs)

Subject Areas: Chemistry

Instruments: B18-Core EXAFS