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. 2008 Nov 7;322(5903):932-4.
doi: 10.1126/science.1164170. Epub 2008 Oct 9.

Reaction-driven restructuring of Rh-Pd and Pt-Pd core-shell nanoparticles

Feng Tao  1 , Michael E Grass, Yawen Zhang, Derek R Butcher, James R Renzas, Zhi Liu, Jen Y Chung, Bongjin S Mun, Miquel Salmeron, Gabor A Somorjai
Affiliations
Free article

Reaction-driven restructuring of Rh-Pd and Pt-Pd core-shell nanoparticles

Feng Tao et al. Science. .
Free article

Abstract

Heterogeneous catalysts that contain bimetallic nanoparticles may undergo segregation of the metals, driven by oxidizing and reducing environments. The structure and composition of core-shell Rh(0.5)Pd(0.5) and Pt(0.5)Pd(0.5) nanoparticle catalysts were studied in situ, during oxidizing, reducing, and catalytic reactions involving NO, O2, CO, and H2 by x-ray photoelectron spectroscopy at near-ambient pressure. The Rh(0.5)Pd(0.5) nanoparticles underwent dramatic and reversible changes in composition and chemical state in response to oxidizing or reducing conditions. In contrast, no substantial segregation of Pd or Pt atoms was found in Pt(0.5)Pd(0.5) nanoparticles. The different behaviors in restructuring and chemical response of Rh(0.5)Pd(0.5) and Pt(0.5)Pd(0.5) nanoparticle catalysts under the same reaction conditions illustrates the flexibility and tunability of the structure of bimetallic nanoparticle catalysts during catalytic reactions.

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