The spatial distribution of Ce3+and Ce4+in each particle of Ce2Zr2Oxin a three-way conversion catalyst system was successfully imaged during an oxygen storage/release cycle by scanning X-ray absorption fine structure (XAFS) using hard X-ray nanobeams. For the first time, nano-XAFS imaging visualized and identified the modes of non-uniform oxygen diffusion from the interface of Pt catalyst and Ce2Zr2Oxsupport and the active parts in individual catalyst particles.
- XAFS imaging
- heterogeneous catalysis
- oxygen storage capacity
- structure–activity relationships
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