|About this Abstract
||Materials Science & Technology 2009
||Characterization and Modeling of Ceramic-Ceramic and Metal-Ceramic Interfaces
||Structural Investigation of Model Planar Perovskite-Supported Precious-Metal Catalysts
||Michael B. Katz, Hong Liu, Hung-Wen Jen, Richard E. Soltis, George W. Graham, Xiaoqing Pan
|On-Site Speaker (Planned)
||Michael B. Katz
The Daihatsu Intelligent Catalyst, for three-way automotive exhaust-gas catalysis, is based on the idea that precious-metal particles can alternately enter a perovskite support as cations under lean conditions and re-form as small metallic particles under rich conditions, thereby preventing particle coarsening and loss of catalytic activity over time. In order to investigate the underlying processes in detail, platinum, palladium, or rhodium was vacuum-deposited on various single-crystal perovskite support films, grown by pulsed laser deposition, and the resulting samples were treated under varying oxidative and reductive conditions. Transmission electron microscopy was then utilized to observe precious-metal/perovskite interactions in these model planar catalyst systems and to characterize the resulting crystal structures. Preliminary results generally reveal dissolution and re-formation of metal particles. Many important features such as maintenance of long-term catalytic activity remain under investigation.