Imaging of Oxygen Diffusion in Individual Platinum/Ce2 Zr2 Ox Catalyst Particles During Oxygen Storage and Release

Hirosuke Matsui; Nozomu Ishiguro; Kaori Enomoto; Oki Sekizawa; Tomoya Uruga; Mizuki Tada

doi:10.1002/anie.201606046

Imaging of Oxygen Diffusion in Individual Platinum/Ce2 Zr2 Ox Catalyst Particles During Oxygen Storage and Release

Angew Chem Int Ed Engl. 2016 Sep 19;55(39):12022-5. doi: 10.1002/anie.201606046. Epub 2016 Aug 30.

Authors

Hirosuke Matsui¹, Nozomu Ishiguro², Kaori Enomoto¹, Oki Sekizawa³, Tomoya Uruga^{3

4}, Mizuki Tada^{5

6}

Affiliations

¹ Department of Chemistry, Graduate School of Science & Research Center for Materials Science (RCMS) & Integrated Research Consortium on Chemical Sciences (IRCCS), Nagoya University, Furo, Chikusa, Nagoya, Aichi, 464-8602, Japan.
² RIKEN SPring-8 Center, Koto, Sayo, Hyogo, 679-5198, Japan.
³ Innovation Research Center for Fuel Cells, The University of Electro-Communications, Tokyo, Japan.
⁴ Japan Synchrotron Radiation Research Center, Hyogo, Japan.
⁵ Department of Chemistry, Graduate School of Science & Research Center for Materials Science (RCMS) & Integrated Research Consortium on Chemical Sciences (IRCCS), Nagoya University, Furo, Chikusa, Nagoya, Aichi, 464-8602, Japan. mtada@chem.nagoya-u.ac.jp.
⁶ RIKEN SPring-8 Center, Koto, Sayo, Hyogo, 679-5198, Japan. mtada@chem.nagoya-u.ac.jp.

PMID: 27574097
DOI: 10.1002/anie.201606046

Abstract

The spatial distribution of Ce(3+) and Ce(4+) in each particle of Ce2 Zr2 Ox in 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 Ce2 Zr2 Ox support and the active parts in individual catalyst particles.

Keywords: XAFS imaging; ceria-zirconia; heterogeneous catalysis; oxygen storage capacity; structure-activity relationships.

Publication types

Research Support, Non-U.S. Gov't