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Visualization of Heterogeneous Oxygen Storage Behavior in Platinum‐Supported Cerium‐Zirconium Oxide Three‐Way Catalyst Particles by Hard X‐ray Spectro‐Ptychography
Author(s) -
Hirose Makoto,
Ishiguro Nozomu,
Shimomura Kei,
Burdet Nicolas,
Matsui Hirosuke,
Tada Mizuki,
Takahashi Yukio
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201710798
Subject(s) - x ray absorption fine structure , cerium , zirconium , cerium oxide , oxygen storage , platinum , catalysis , materials science , valence (chemistry) , oxide , analytical chemistry (journal) , inorganic chemistry , chemistry , metallurgy , spectroscopy , physics , biochemistry , organic chemistry , chromatography , quantum mechanics
The cerium density and valence in micrometer‐size platinum‐supported cerium–zirconium oxide Pt/Ce 2 Zr 2 O x (x=7–8) three‐way catalyst particles were successfully mapped by hard X‐ray spectro‐ptychography (ptychographic‐X‐ray absorption fine structure, XAFS). The analysis of correlation between the Ce density and valence in ptychographic‐XAFS images suggested the existence of several oxidation behaviors in the oxygen storage process in the Ce 2 Zr 2 O x particles. Ptychographic‐XAFS will open up the nanoscale chemical imaging and structural analysis of heterogeneous catalysts.