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Preparation, thermal stability, and CO oxidation activity of highly loaded Au/titania-coated silica aerogel catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
43021 45951 2008 6 PDF Available
Title
Preparation, thermal stability, and CO oxidation activity of highly loaded Au/titania-coated silica aerogel catalysts
Abstract

We have prepared Au/titania-coated silica aerogel catalysts having Au loadings ranging from 0.14 to 20 wt.% using the liquid phase adsorption of preformed Au nanoparticles (NPs) onto the support. Using transmission electron microscopy, we confirmed that AuNPs as small as 2 nm were well dispersed in the catalyst samples, preserving their original diameters after heat treatment at 673 K. As a result, in contrast to the behavior of catalysts prepared using the conventional deposition–precipitation method, the CO oxidation activity per catalyst increased monotonously with increasing Au loading. These results suggest that this preparation procedure and support allow the AuNPs to preserve their intrinsic oxidation activities over a wide loading range. We also found that the AuNPs on this support were resistant to thermal sintering: the diameter of the particles remained well below 5 nm even after calcination at 973 K for 2 h.

Graphical abstractAu/titania-coated silica aerogel catalysts having Au loadings ranging from 0.14 to 20 wt.% have been prepared using liquid phase adsorption. In contrast to the catalysts prepared through conventional deposition–precipitation, the CO oxidation activity per catalyst increased monotonously with increasing Au loading. The diameters of the Au particles remained well below 5 mm, even after calcination at 973 K for 2 h. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Supported gold catalyst; Au nanoparticle; Aerogel support; Adsorption; High loadings; CO oxidation; TEM
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Preparation, thermal stability, and CO oxidation activity of highly loaded Au/titania-coated silica aerogel catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 342, Issues 1–2, 30 June 2008, Pages 113–118
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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