Understanding the CO Oxidation on Pt Nanoparticles Supported on MOFs by Operando XPS

Reza Vakili, Emma K. Gibson, Sarayute Chansai, Shaojun Xu, Nadeen Al-Janabi, Peter P. Wells, Christopher Hardacre, Alex Walton, Xiaolei Fan

Research output: Journal PublicationArticlepeer-review

25 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)4238-4242
Number of pages5
JournalChemCatChem
Volume10
Issue number19
DOIs
Publication statusPublished - 9 Oct 2018
Externally publishedYes

Keywords

  • CO Oxidation
  • Confinement Effect
  • Metal-Organic Frameworks (MOFs)
  • Operando Near Ambient Pressure XPS (NAP-XPS)
  • Pt Catalysts

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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