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Understanding the CO Oxidation on Pt Nanoparticles Supported on MOFs by Operando XPS
Author(s) -
Vakili Reza,
Gibson Emma K.,
Chansai Sarayute,
Xu Shaojun,
AlJanabi Nadeen,
Wells Peter P.,
Hardacre Christopher,
Walton Alex,
Fan Xiaolei
Publication year - 2018
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201801067
Subject(s) - catalysis , x ray photoelectron spectroscopy , chemical engineering , nanoparticle , materials science , sintering , platinum , metal , chemistry , nanotechnology , organic chemistry , engineering , metallurgy , composite material
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@ZrO 2 catalysts, revealing the same Pt surface dynamics under the stoichiometric CO/O 2 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@ZrO 2 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.