Palladium redispersion at high temperature within the Pd@SiO2 core@shell structure

Chang Yup Seo; Xiaoyin Chen; Kai Sun; Lawrence F. Allard; Galen B. Fisher; Johannes W. Schwank

doi:10.1016/j.catcom.2018.01.027

Palladium redispersion at high temperature within the Pd@SiO₂ core@shell structure

Chang Yup Seo, Xiaoyin Chen, Kai Sun, Lawrence F. Allard, Galen B. Fisher, Johannes W. Schwank

Nuclear Energy Materials Microanalysis

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

Abstract

Maintaining high dispersion of palladium is critical for Pd-based catalysts, which suffer from deactivation due to sintering at high temperatures (≥800 °C). Here, we report direct evidence that Pd nanoparticles (~4 nm) of a palladium silica core@shell (Pd@SiO₂) catalyst can redisperse into nanoclusters (≤2 nm) after aging at 800 °C, where severe Pd sintering would be expected on supported Pd catalysts. The Pd redispersion was confirmed by in situ, as well as ex situ, high resolution transmission electron microscopy, and is manifested by a remarkably decreased light-off temperature for CO oxidation after aging.

Original language	English
Pages (from-to)	73-76
Number of pages	4
Journal	Catalysis Communications
Volume	108
DOIs	https://doi.org/10.1016/j.catcom.2018.01.027
State	Published - Apr 2018

Funding

This work was supported by the US Department of Energy under Cooperative Agreement [No. DE-EE0006845], Subcontract agreement [No. RQ15-337R01]. The support of the University of Michigan College of Engineering and NSF grant [DMR-9871177] for the JEOL 2010F transmission electron microscope is also acknowledged. This work was supported by the US Department of Energy under Cooperative Agreement [No. DE-EE0006845 ], Subcontract agreement [No. RQ15-337R01 ]. The support of the University of Michigan College of Engineering and NSF grant [ DMR-9871177 ] for the JEOL 2010F transmission electron microscope is also acknowledged. Appendix A

Funders	Funder number
US Department of Energy
National Science Foundation	DMR-9871177
U.S. Department of Energy	DE-EE0006845, RQ15-337R01
College of Engineering, Michigan State University
University of Michigan
National Stroke Foundation

Keywords

CO oxidation
Core@shell
Palladium
Redispersion
TEM

Access to Document

10.1016/j.catcom.2018.01.027

Cite this

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title = "Palladium redispersion at high temperature within the Pd@SiO2 core@shell structure",

abstract = "Maintaining high dispersion of palladium is critical for Pd-based catalysts, which suffer from deactivation due to sintering at high temperatures (≥800 °C). Here, we report direct evidence that Pd nanoparticles (~4 nm) of a palladium silica core@shell (Pd@SiO2) catalyst can redisperse into nanoclusters (≤2 nm) after aging at 800 °C, where severe Pd sintering would be expected on supported Pd catalysts. The Pd redispersion was confirmed by in situ, as well as ex situ, high resolution transmission electron microscopy, and is manifested by a remarkably decreased light-off temperature for CO oxidation after aging.",

keywords = "CO oxidation, Core@shell, Palladium, Redispersion, TEM",

author = "Seo, {Chang Yup} and Xiaoyin Chen and Kai Sun and Allard, {Lawrence F.} and Fisher, {Galen B.} and Schwank, {Johannes W.}",

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AU - Seo, Chang Yup

AU - Chen, Xiaoyin

AU - Sun, Kai

AU - Allard, Lawrence F.

AU - Fisher, Galen B.

AU - Schwank, Johannes W.

PY - 2018/4

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AB - Maintaining high dispersion of palladium is critical for Pd-based catalysts, which suffer from deactivation due to sintering at high temperatures (≥800 °C). Here, we report direct evidence that Pd nanoparticles (~4 nm) of a palladium silica core@shell (Pd@SiO2) catalyst can redisperse into nanoclusters (≤2 nm) after aging at 800 °C, where severe Pd sintering would be expected on supported Pd catalysts. The Pd redispersion was confirmed by in situ, as well as ex situ, high resolution transmission electron microscopy, and is manifested by a remarkably decreased light-off temperature for CO oxidation after aging.

KW - CO oxidation

KW - Core@shell

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