Journal
JOURNAL OF CATALYSIS
Volume 293, Issue -, Pages 145-148Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2012.06.017
Keywords
Platinum; Rhodium; Perovskite; TWC; Catalyst re-dispersion; TEM; HAADF-STEM
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Funding
- Ford Motor Company under a Ford - University of Michigan Innovation Alliance grant
- National Science Foundation [DMR-0907191, DMR-0723032]
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High-angle annular dark-field imaging with aberration-corrected scanning transmission electron microscopy unambiguously establishes that nanometer-size Pt-rich clusters reversibly precipitate and dissolve under reducing and oxidizing conditions, respectively, within the oxide matrix of Pt-doped CaTiO3, previously proposed as a novel self-regenerating perovskite-based three-way catalyst. In fact, most of the Pt-rich clusters formed upon reduction are within the oxide matrix and thus unavailable for gas-phase catalysis. Those clusters of Pt that do form on the surface tend to coarsen rather than dissolve upon oxidation. (C) 2012 Elsevier Inc. All rights reserved.
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