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

Abstract

The structure and composition of core-shell Rh{sub 0.5}Pd{sub 0.5} and Pt{sub 0.5}Pd{sub 0.5} nanoparticle catalysts were studied in situ, during oxidizing, reducing, and catalytic reactions involving NO, O{sub 2}, CO, and H{sub 2} using X-ray photoelectron spectroscopy in the Torr pressure range. The Rh{sub 0.5}Pd{sub 0.5} nanoparticles undergo dramatic and reversible changes in composition and chemical state in response to oxidizing or reducing conditions. Under oxidizing conditions the Rh atoms segregate to the shell region while in reducing atmospheres the Pd atoms diffuse to the shell region. In contrast no significant segregation of Pd or Pt atoms was found in Pt{sub 0.5}Pd{sub 0.5} nanoparticles. The distinct behavior in restructuring and chemical response of Rh{sub 0.5}Pd{sub 0.5} and Pt{sub 0.5}Pd{sub 0.5} nanoparticle catalysts under the same reaction conditions illustrates the flexibility and tunability of the structure of bimetallic nanoparticle catalysts during catalytic reactions.

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
Materials Sciences Division
OSTI Identifier:
959423
Report Number(s):
LBNL-1379E
Journal ID: ISSN 0193-4511; SCEHDK; TRN: US200924%%726
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
Science
Additional Journal Information:
Journal Name: Science; Journal ID: ISSN 0193-4511
Country of Publication:
United States
Language:
English
Subject:
36; ATOMS; CATALYSTS; CHEMICAL STATE; FLEXIBILITY; PRESSURE RANGE; SEGREGATION; X-RAY PHOTOELECTRON SPECTROSCOPY

Citation Formats

Tao, Feng, Grass, Michael E, Zhang, Yawen, Butcher, Derek R, Renzas, James R, Liu, Zhi, Chung, Jen Y, Mun, Bongjin S, Salmeron, Miquel, and Somorjai, Gabor A. Reaction-Driven Restructuring of Rh-Pd and Pt-Pd Core-Shell Nanoparticles. United States: N. p., 2009. Web.
Tao, Feng, Grass, Michael E, Zhang, Yawen, Butcher, Derek R, Renzas, James R, Liu, Zhi, Chung, Jen Y, Mun, Bongjin S, Salmeron, Miquel, & Somorjai, Gabor A. Reaction-Driven Restructuring of Rh-Pd and Pt-Pd Core-Shell Nanoparticles. United States.
Tao, Feng, Grass, Michael E, Zhang, Yawen, Butcher, Derek R, Renzas, James R, Liu, Zhi, Chung, Jen Y, Mun, Bongjin S, Salmeron, Miquel, and Somorjai, Gabor A. Wed . "Reaction-Driven Restructuring of Rh-Pd and Pt-Pd Core-Shell Nanoparticles". United States. https://www.osti.gov/servlets/purl/959423.
@article{osti_959423,
title = {Reaction-Driven Restructuring of Rh-Pd and Pt-Pd Core-Shell Nanoparticles},
author = {Tao, Feng and Grass, Michael E and Zhang, Yawen and Butcher, Derek R and Renzas, James R and Liu, Zhi and Chung, Jen Y and Mun, Bongjin S and Salmeron, Miquel and Somorjai, Gabor A},
abstractNote = {The structure and composition of core-shell Rh{sub 0.5}Pd{sub 0.5} and Pt{sub 0.5}Pd{sub 0.5} nanoparticle catalysts were studied in situ, during oxidizing, reducing, and catalytic reactions involving NO, O{sub 2}, CO, and H{sub 2} using X-ray photoelectron spectroscopy in the Torr pressure range. The Rh{sub 0.5}Pd{sub 0.5} nanoparticles undergo dramatic and reversible changes in composition and chemical state in response to oxidizing or reducing conditions. Under oxidizing conditions the Rh atoms segregate to the shell region while in reducing atmospheres the Pd atoms diffuse to the shell region. In contrast no significant segregation of Pd or Pt atoms was found in Pt{sub 0.5}Pd{sub 0.5} nanoparticles. The distinct behavior in restructuring and chemical response of Rh{sub 0.5}Pd{sub 0.5} and Pt{sub 0.5}Pd{sub 0.5} nanoparticle catalysts under the same reaction conditions illustrates the flexibility and tunability of the structure of bimetallic nanoparticle catalysts during catalytic reactions.},
doi = {},
journal = {Science},
issn = {0193-4511},
number = ,
volume = ,
place = {United States},
year = {2009},
month = {6}
}