Self-regeneration of Pd-LaFeO3 Catalysts: New Insight from Atomic-resolution Electron Microscopy

Overview

Journal J Am Chem Soc

Publisher American Chemical Society

Specialty Chemistry

Date 2011 Oct 20

PMID 22007950

Citations 13

Authors

Michael B Katz

George W Graham

Yingwen Duan

Hong Liu

Carolina Adamo

Darrell G Schlom

Xiaoqing Pan

Affiliations

Soon will be listed here.

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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