Journal
CHEMCATCHEM
Volume 10, Issue 19, Pages 4238-4242Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201801067
Keywords
Metal-Organic Frameworks (MOFs); Pt Catalysts; Operando Near Ambient Pressure XPS (NAP-XPS); CO Oxidation; Confinement Effect
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Funding
- Royal Society [RG160031]
- University of Manchester President's Doctoral Scholar Award
- UK Catalysis Hub
- EPSRC [EP/K014706/2, EP/P025021/1] Funding Source: UKRI
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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/O-2 ambient at 3 mbar. Upon the ignition at ca. 200 degrees 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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