Issue 5, 2015

γ-Al2O3 supported Pd@CeO2 core@shell nanospheres: salting-out assisted growth and self-assembly, and their catalytic performance in CO oxidation

Abstract

In this paper, we have successfully demonstrated the clean synthesis of high-quality Pd@CeO2 core@shell nanospheres with tunable Pd core sizes in water, and furthermore loaded the as-obtained Pd@CeO2 products on commercial γ-Al2O3via electrostatic interaction. KBr here plays two key roles in inducing the growth and self-assembly of Pd@CeO2 core@shell nanospheres. First, Br ions can retard the reduction of Pd2+ ions via the formation of the more stable complex of [PdBr4]2− so as to tune the size of Pd cores. Second, it greatly decreases the colloidal stability, and hence the surface polarity-weakened Pd and CeO2 NPs have to spontaneously self-assemble into more stable and ordered structures. Among different-sized Pd samples, the as-obtained 8 nm-Pd@CeO2/Al2O3 one exhibits the best performance in catalytic CO oxidation, which can catalyze 100% CO conversion into CO2 at 95 °C, which is much lower than the previously reported CeO2-encapsulated Pd samples.

Graphical abstract: γ-Al2O3 supported Pd@CeO2 core@shell nanospheres: salting-out assisted growth and self-assembly, and their catalytic performance in CO oxidation

Supplementary files

Article information

Article type
Edge Article
Submitted
12 12 2014
Accepted
27 2 2015
First published
27 2 2015
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY license

Chem. Sci., 2015,6, 2877-2884

Author version available

γ-Al2O3 supported Pd@CeO2 core@shell nanospheres: salting-out assisted growth and self-assembly, and their catalytic performance in CO oxidation

X. Wang, D. Liu, J. Li, J. Zhen, F. Wang and H. Zhang, Chem. Sci., 2015, 6, 2877 DOI: 10.1039/C4SC03854A

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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