Issue 35, 2020

Divergent influence of {1 1 1} vs. {1 0 0} crystal planes and Yb3+ dopant on CO oxidation paths in mixed nano-sized oxide Au/Ce1−xYbxO2−x/2 (x = 0 or 0.1) systems

Abstract

In this paper, the fundamental information on interactions in systems concerning nanocrystalline gold disperses on the shaped (octahedron-like or cube-like) Ce1−xYbxO2−x/2 (x = 0 or 0.1) support has been discussed. Four types of Au/Ce1−xYbxO2−x/2 systems with different morphology and defect level of support have been investigated. It was observed that the microstructure and structural features of the support crystals play a key role in the reaction of CO oxidation catalysed by Au/Ce1−xYbxO2−x/2 materials. The divergent influence of Yb3+ dopant on the CO reaction as a function of exposing planes of the support was observed for Ce1−xYbxO2−x/2 and Au/Ce1−xYbxO2−x/2 systems. For the undecorated oxides, the presence of Yb3+ ions in the ceria matrix increased the activity of the octahedron-like oxides, but decreased it for the cube-like ones. On the other hand, the positive effect of the Yb-dopant on the reactivity of Au/Ce1−xYbxO2−x/2 systems was observed for both morphologies.

Graphical abstract: Divergent influence of {1 1 1} vs. {1 0 0} crystal planes and Yb3+ dopant on CO oxidation paths in mixed nano-sized oxide Au/Ce1−xYbxO2−x/2 (x = 0 or 0.1) systems

Supplementary files

Article information

Article type
Paper
Submitted
22 Jun 2020
Accepted
06 Aug 2020
First published
07 Aug 2020

CrystEngComm, 2020,22, 5828-5840

Divergent influence of {1 1 1} vs. {1 0 0} crystal planes and Yb3+ dopant on CO oxidation paths in mixed nano-sized oxide Au/Ce1−xYbxO2−x/2 (x = 0 or 0.1) systems

P. Woźniak, P. Kraszkiewicz and M. A. Małecka, CrystEngComm, 2020, 22, 5828 DOI: 10.1039/D0CE00891E

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