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Gold supported on ceria nanoparticles and nanotubes

Paper ID Volume ID Publish Year Pages File Format Full-Text
40751 45864 2012 9 PDF Available
Title
Gold supported on ceria nanoparticles and nanotubes
Abstract

The ceria nanotubes with different size have been prepared via a hydrothermal treatment of CeO2 nanoparticles at 120 °C with two different NaOH concentrations (5 or 10 M) for 36 h. The synthesized ceria samples characterized by SEM, TEM, XRD, and UV–visible spectroscopy were used as supports for Au/CeO2 catalysts preparation by DP technique using HAuCl4 as gold precursor and urea as precipitation agent. The formation of gold nanoparticles (Au NPs) has been studied by TEM, in situ UV–visible–mass analysis at temperature programmed reduction and XPS spectroscopy. Three distinguishable steps in the formation of Au NPs accompanied by profound ceria reduction particular for ceria nanotubes have been found. Au NPs stabilized on the ceria nanotubes have been characterized with higher activity in CO oxidation than those supported on ceria nanoparticles. The structure and redox treatment of ceria nanotubes affects size of Au NPs and their catalytic activity in CO oxidation. Pre-oxidized Au/CeO2-nanotubes manifest the highest activity in CO oxidation.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (206 K)Download as PowerPoint slideHighlights► Various CeO2 nanotubes were prepared via hydrothermal treatment of CeO2 particles. ► Au NPs on ceria nanotubes are more active in CO oxidation than those on ceria NPs. ► Redox treatments of ceria nanotubes affect size and activity of Au NPs in CO oxidation. ► Oxidized Au/CeO2-nanotubes samples manifest the highest activity in CO oxidation.

Keywords
Ceria nanotubes; Hydrothermal treatment; Gold nanoparticles; UV–vis in situ; CO oxidation
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Gold supported on ceria nanoparticles and nanotubes
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 449, 27 December 2012, Pages 96–104
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
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Any Questions? feel free to contact us