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Title: A general mechanism for stabilizing the small sizes of precious metal nanoparticles on oxide supports

Abstract

We recently discovered that MgAl2O4 spinel {111} nano-facets optimally stabilize the small sizes of platinum nanoparticles even after severe high temperature aging treatments. Here we report the thermal stabilities of other precious metals with various physical and chemical properties on the MgAl2O4 spinel {111} facets, providing important new insights into the stabilization mechanisms. Besides Pt, Rh and Ir can also be successfully stabilized as small (1-3 nm) nanoparticles and even as single atomic species after extremely severe (800 °C, 1 week) oxidative aging. However, other metals either aggregate (Ru, Pd, Ag, and Au) or sublimate (Os) even during initial catalyst synthesis. On the basis of ab initio theoretical calculations and experimental observations, we rationalize that the exceptional stabilization originates from lattice matching, and the correspondingly strong attractive interactions at interfaces between the spinel {111} surface oxygens and epitaxial metals\metal oxides. On this basis, design principles for catalyst support oxide materials that are capable in stabilizing precious metals are proposed.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1168910
Report Number(s):
PNNL-SA-95940
47582; KC0302010
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Chemistry of Materials, 26(19):5475-5481
Country of Publication:
United States
Language:
English
Subject:
Precious metal; nanoparticles; MgAl2O4 spinel; thermal stability; anti-sintering; Environmental Molecular Sciences Laboratory

Citation Formats

Li, Wei-Zhen, Kovarik, Libor, Mei, Donghai, Engelhard, Mark H., Gao, Feng, Liu, Jun, Wang, Yong, and Peden, Charles HF. A general mechanism for stabilizing the small sizes of precious metal nanoparticles on oxide supports. United States: N. p., 2014. Web. doi:10.1021/cm5013203.
Li, Wei-Zhen, Kovarik, Libor, Mei, Donghai, Engelhard, Mark H., Gao, Feng, Liu, Jun, Wang, Yong, & Peden, Charles HF. A general mechanism for stabilizing the small sizes of precious metal nanoparticles on oxide supports. United States. doi:10.1021/cm5013203.
Li, Wei-Zhen, Kovarik, Libor, Mei, Donghai, Engelhard, Mark H., Gao, Feng, Liu, Jun, Wang, Yong, and Peden, Charles HF. Tue . "A general mechanism for stabilizing the small sizes of precious metal nanoparticles on oxide supports". United States. doi:10.1021/cm5013203.
@article{osti_1168910,
title = {A general mechanism for stabilizing the small sizes of precious metal nanoparticles on oxide supports},
author = {Li, Wei-Zhen and Kovarik, Libor and Mei, Donghai and Engelhard, Mark H. and Gao, Feng and Liu, Jun and Wang, Yong and Peden, Charles HF},
abstractNote = {We recently discovered that MgAl2O4 spinel {111} nano-facets optimally stabilize the small sizes of platinum nanoparticles even after severe high temperature aging treatments. Here we report the thermal stabilities of other precious metals with various physical and chemical properties on the MgAl2O4 spinel {111} facets, providing important new insights into the stabilization mechanisms. Besides Pt, Rh and Ir can also be successfully stabilized as small (1-3 nm) nanoparticles and even as single atomic species after extremely severe (800 °C, 1 week) oxidative aging. However, other metals either aggregate (Ru, Pd, Ag, and Au) or sublimate (Os) even during initial catalyst synthesis. On the basis of ab initio theoretical calculations and experimental observations, we rationalize that the exceptional stabilization originates from lattice matching, and the correspondingly strong attractive interactions at interfaces between the spinel {111} surface oxygens and epitaxial metals\metal oxides. On this basis, design principles for catalyst support oxide materials that are capable in stabilizing precious metals are proposed.},
doi = {10.1021/cm5013203},
journal = {Chemistry of Materials, 26(19):5475-5481},
number = ,
volume = ,
place = {United States},
year = {Tue Sep 02 00:00:00 EDT 2014},
month = {Tue Sep 02 00:00:00 EDT 2014}
}