Self-regeneration of Pd-LaFeO3 catalysts: new insight from atomic-resolution electron microscopy |
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| Authors: | Katz Michael B Graham George W Duan Yingwen Liu Hong Adamo Carolina Schlom Darrell G Pan Xiaoqing |
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| Affiliation: | Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States. |
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| Abstract: | Aberration-corrected transmission electron microscopy was used to study atomic-scale processes in Pd-LaFeO(3) catalysts. Clear evidence for diffusion of Pd into LaFeO(3) and out of LaFe(0.95)Pd(0.05)O(3-δ) under high-temperature oxidizing and reducing conditions, respectively, was found, but the extent to which these processes occurred was quite limited. These observations cast doubt that such phenomena play a significant role in a postulated mechanism of self-regeneration of this system as an automotive exhaust-gas catalyst. |
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