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Structure and reactivity of Au–Rh bimetallic clusters on titanate nanowires, nanotubes and TiO2(1 1 0)

Paper ID Volume ID Publish Year Pages File Format Full-Text
55454 47053 2012 8 PDF Available
Title
Structure and reactivity of Au–Rh bimetallic clusters on titanate nanowires, nanotubes and TiO2(1 1 0)
Abstract

Au and Rh clusters, as well as Au–Rh bimetallic nanoparticles were prepared on titanate nanowires, nanotubes and on TiO2(1 1 0). They were characterized by X-ray photoelectron spectroscopy (XPS), low energy ion scattering spectroscopy (LEIS) and Fourier transform infrared spectroscopy (FTIR). By performing careful LEIS experiments, it was found that for appropriate Au and Rh coverage, a thin Au layer almost completely covers the Rh nanoparticles, a Rh core–Au shell structure was detected. The formation of this structure was not affected by alkali (K) adatoms. LEIS and FTIR measurements disclosed that adsorbed CO at 300 K causes the segregation of Rh atoms to the surface of metal clusters in order to bind to CO. Upon CO adsorption on Rh/titanate nanostructures the IR stretching frequencies characteristic of the twin form were dominant, whereas bimetallic nanosystems featured a pronounced linear stretching vibration as well. In spite of this structure adsorbed CO is detectable during the ethanol adsorption on gold–rhodium bimetallic cluster and the ethanol decomposition rate is twice higher than on Au/TiO2.

Graphical abstractIt was found that for appropriate Au and Rh coverage a thin Au layer covers the Rh nanoparticles. LEIS and FTIR measurements disclosed that adsorbed CO already at 300 K causes the segregation of Rh to the surface of metal clusters in order to bind CO.Figure optionsDownload full-size imageDownload high-quality image (209 K)Download as PowerPoint slideHighlights► A thin Au layer covers the Rh nonoparticles; this structure was not affected by K. ► Adsorbed CO causes the segregation of Rh atoms to the surface. ► The ethanol decomposition rate on bimetallic clusters is twice higher than on Au/TiO2.

Keywords
Core–shell structure; Titania nanowire; Titania nanotube; Gold; Rhodium; Ethanol decomposition
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Structure and reactivity of Au–Rh bimetallic clusters on titanate nanowires, nanotubes and TiO2(1 1 0)
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 181, Issue 1, 12 February 2012, Pages 163–170
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us