Please use this identifier to cite or link to this item: https://doi.org/10.15480/882.2072
Publisher DOI: 10.3762/bjnano.4.13
Title: Catalytic activity of nanostructured Au : scale effects versus bimetallic/bifunctional effects in low-temperature CO oxidation on nanoporous Au
Language: English
Authors: Wang, Lu-Cun 
Zhong, Yi 
Jin, Haijun 
Widmann, Daniel 
Weissmüller, Jörg 
Behm, R. Jürgen 
Keywords: AuAg alloy;AuCu alloy;CO oxidation;dynamic studies;kinetics;nanoporous Au (NPG) catalyst;oxygen storage capacity (OSC);temporal analysis of products (TAP)
Issue Date: 19-Feb-2013
Publisher: Beilstein-Institut ; PubMed Central
Source: Beilstein journal of nanotechnology 1 (4): 111-128 (2013)
Journal or Series Name: Beilstein journal of nanotechnology 
Abstract (english): The catalytic properties of nanostructured Au and their physical origin were investigated by using the low-temperature CO oxidation as a test reaction. In order to distinguish between structural effects (structure-activity correlations) and bimetallic/bifunctional effects, unsupported nanoporous gold (NPG) samples prepared from different Au alloys (AuAg, AuCu) by selective leaching of a less noble metal (Ag, Cu) were employed, whose structure (surface area, ligament size) as well as their residual amount of the second metal were systematically varied by applying different potentials for dealloying. The structural and chemical properties before and after 1000 min reaction were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The catalytic behavior was evaluated by kinetic measurements in a conventional microreactor and by dynamic measurements in a temporal analysis of products (TAP) reactor. The data reveal a clear influence of the surface contents of residual Ag and Cu species on both O2 activation and catalytic activity, while correlations between activity and structural parameters such as surface area or ligament/crystallite size are less evident. Consequences for the mechanistic understanding and the role of the nanostructure in these NPG catalysts are discussed.
URI: http://hdl.handle.net/11420/2076
DOI: 10.15480/882.2072
ISSN: 2190-4286
Institute: Werkstoffphysik und -technologie M-22 
Type: (wissenschaftlicher) Artikel
Funded by: Baden-Württemberg Stiftung ; Alexander-von Humboldt-Stiftung
Appears in Collections:Publications (tub.dok)

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