Visualization of the heterogeneity of cerium oxidation states in single Pt/Ce2Zr2Ox catalyst particles by nano-XAFS

Nozomu Ishiguro, Tomoya Uruga, Oki Sekizawa, Takuya Tsuji, Motohiro Suzuki, Naomi Kawamura, Masaichiro Mizumaki, Kiyofumi Nitta, Toshihiko Yokoyama, Mizuki Tada

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

The cerium oxidation states in single catalyst particles of Pt/Ce 2Zr2Ox (x=7 to 8) were investigated by spatially resolved nano X-ray absorption fine structure (nano-XAFS) using an X-ray nanobeam. Differences in the distribution of the Ce oxidation states between Pt/Ce2Zr2Ox single particles of different oxygen compositions x were visualized in the obtained two-dimensional X-ray fluorescent (XRF) mapping images and the Ce LIII-edge nano X-ray absorption near-edge structure (nano-XANES) spectra. State heterogeneity: The cerium oxidation states in single catalyst particles of Pt/Ce 2Zr2Ox (x=7 to 8) are investigated by spatially resolved nano-XAFS using an X-ray nanobeam. Differences in the distribution of Ce oxidation states between Pt/Ce2Zr2Ox single particles of different oxygen compositions x are visualized in the obtained 2D XRF mapping images and the Ce LIII-edge nano-XANES spectra.

Original languageEnglish
Pages (from-to)1563-1568
Number of pages6
JournalChemPhysChem
Volume15
Issue number8
DOIs
Publication statusPublished - 2014 Jun 6
Externally publishedYes

Keywords

  • ceria-zirconia catalyst
  • imaging
  • nano X-ray absorption fine structure
  • oxygen storage capacity
  • single particles

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry

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