Self-Regeneration of Pd–LaFeO3 Catalysts: New Insight from Atomic-Resolution Electron Microscopy
J. Am. Chem. Soc., 2011, 133 (45), pp 18090–18093
DOI: 10.1021/ja2082284
Publication Date (Web): October 18, 2011
Aberration-corrected transmission electron microscopy was used to study atomic-scale processes in Pd–LaFeO3 catalysts. Clear evidence for diffusion of Pd into LaFeO3 and out of LaFe0.95Pd0.05O3−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.