Abstract

A new approach for preparing a PtOx/CeO2 catalyst for low-temperature CO oxidation has been developed. The approach includes; i) preparation of a CeO2 support through the controllable thermal decomposition of Ce(NO3)3 ⋅ 6H2O, and then ii) deposition of polynuclear platinum nitrato complexes ([H3O⊂18-crown-6]2[Pt22-OH)2(NO3)8][Pt43-OH)22-OH)4(NO3)10]) on the CeO2 support. The NO3 -rich ceria support produced at the onset temperature of Ce(NO3)3 -> CeO2 transformation (220 °C) yields the “PtOx/CeO2-220” catalyst that shows intriguingly high activity in CO oxidation, at room temperature and below. To understand the nature of the low-temperature catalytic activity, prepared catalysts have been studied using X-ray photoelectron spectroscopy (XPS), Raman and operando X-ray absorption fine structure spectroscopy (XAFS) and transmission electron microscopy (TEM).

Original languageEnglish
Pages (from-to)1413-1428
Number of pages16
JournalChemCatChem
Volume12
Issue number5
DOIs
Publication statusPublished - 6 Mar 2020

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Keywords

  • catalysis, ceria, low-temperature CO oxidation, operando XAS, platinum(IV) nitrato complexes
  • operando XAS
  • X-RAY-ABSORPTION
  • catalysis
  • STATE
  • ceria
  • platinum(IV) nitrato complexes
  • PT/CEO2 CATALYSTS
  • low-temperature CO oxidation
  • CATALYTIC PERFORMANCE
  • DISPERSED PT/CEO2
  • PLATINUM NANOPARTICLES
  • CERIA
  • DEFECT SITES
  • IN-SITU
  • PHOTOELECTRON-SPECTROSCOPY

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