Reaction-Driven Restructuring of Rh-Pd and Pt-Pd Core-Shell Nanoparticles | Zendy

Tao Feng | Zendy; Michael Graß | Zendy; YaWen Zhang | Zendy; Derek R. Butcher | Zendy; Russ Renzas | Zendy; Zhi Liu | Zendy; Jen Y. Chung | Zendy; Bongjin Simon Mun | Zendy; Miquel Salmerón | Zendy; Gábor A. Somorjai | Zendy

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Reaction-Driven Restructuring of Rh-Pd and Pt-Pd Core-Shell Nanoparticles

Author(s) -

Tao Feng,

Michael Graß,

YaWen Zhang,

Derek R. Butcher,

Russ Renzas,

Zhi Liu,

Jen Y. Chung,

Bongjin Simon Mun,

Miquel Salmerón,

Gábor A. Somorjai

Publication year - 2008

Publication title -

science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 12.556

H-Index - 1186

eISSN - 1095-9203

pISSN - 0036-8075

DOI - 10.1126/science.1164170

Subject(s) - bimetallic strip , catalysis , oxidizing agent , nanoparticle , x ray photoelectron spectroscopy , chemical engineering , chemistry , chemical state , materials science , inorganic chemistry , nanotechnology , organic chemistry , engineering

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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