Publication
Title
Quantitative determination of residual silver distribution in nanoporous gold and its influence on structure and catalytic performance
Author
Abstract
Large efforts have been made trying to understand the origin of the high catalytic activity of dealloyed nanoporous gold as a green catalyst for the selective promotion of chemical reactions at low temperatures. Residual silver, left in the sample after dealloying of a gold-silver alloy, has been shown to have a strong influence on the activity of the catalyst. But the question of how the silver is distributed within the porous structure has not finally been answered yet. We show by quantitative energy dispersive X-ray tomography measurements that silver forms clusters that are distributed irregularly, both on the surface and inside the ligaments building up the porous structure. Furthermore, we find that the role of the residual silver is ambiguous. Whereas CO oxidation is supported by more residual silver, methanol oxidation to methyl formate is hindered. Structural characterisation reveals larger ligaments and pores for decreasing residual silver concentration.
Language
English
Source (journal)
Journal of catalysis. - San Diego, Calif., 1962, currens
Publication
San Diego, Calif. : 2017
ISSN
0021-9517 [print]
1090-2694 [online]
DOI
10.1016/J.JCAT.2017.05.002
Volume/pages
352 (2017) , p. 52-58
ISI
000408299600006
Full text (Publisher's DOI)
Full text (open access)
Full text (publisher's version - intranet only)
UAntwerpen
Faculty/Department
Research group
Project info
Colouring Atoms in 3 Dimensions (COLOURATOM).
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identifier
Creation 24.07.2017
Last edited 17.09.2024
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