Self-regeneration of Pd-LaFeO3 catalysts: new insight from atomic-resolution electron microscopy.
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.
Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States.
Michael B
MB
Katz
George W
GW
Graham
Yingwen
Y
Duan
Hong
H
Liu
Carolina
C
Adamo
Darrell G
DG
Schlom
Xiaoqing
X
Pan
D002384:Catalysis; D008854:Microscopy, Electron; D010087:Oxides / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry*
D010087:Oxides; C518665:lanthanum iron oxide; D010165:Palladium