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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 |
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| Authors: | Makoto Hirose Dr Nozomu Ishiguro Kei Shimomura Dr Nicolas Burdet Dr Hirosuke Matsui Prof?Dr Mizuki Tada Prof?Dr Yukio Takahashi |
| Institution: | 1. Department of Engineering, Graduate School of Osaka University, Osaka, Japan;2. RIKEN SPring-8 Center, Kouto, Sayo-cho, Sayo, Hyogo, Japan;3. Current address: Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA;4. Department of Chemistry, Research Center for Materials Science/Graduate School of Science, Nagoya University, Furo-Cho, Chikusa, Nagoya, Aichi, Japan |
| Abstract: | The cerium density and valence in micrometer‐size platinum‐supported cerium–zirconium oxide Pt/Ce2Zr2Ox (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 Ce2Zr2Ox particles. Ptychographic‐XAFS will open up the nanoscale chemical imaging and structural analysis of heterogeneous catalysts. |
| Keywords: | ceria– zirconia oxygen storage three-way catalysts X-ray spectro-ptychography |