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High surface area Au/CeO2 catalysts for low temperature formaldehyde oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
46599 46442 2011 7 PDF Available
Title
High surface area Au/CeO2 catalysts for low temperature formaldehyde oxidation
Abstract

Gold catalysts supported on high surface area CeO2 were synthesized and tested for low temperature formaldehyde oxidation. It was found that the reactivity was greatly enhanced by increasing surface area of the support. Complete conversion of formaldehyde was obtained on a 3.0Au/CeO2-270 catalyst with a surface area of 270 m2 g−1 at 50 °C, and a conversion of 92.3% was obtained at 37 °C over the same catalyst, which made it promising for indoor formaldehyde removal. Detailed characterizations of the catalyst showed that the enhancement could be attributed to two factors. One was that Au species mainly in high oxidation states formed on the high surface area CeO2 resulted in a high degree of HCHO adsorption, as revealed by in situ diffuse reflectance infrared Fourier transform spectroscopy. The other was the high surface area CeO2 provided more oxygen vacancies by the nano effect and the formation of AuxCe1−xO2−δ solid solution as revealed by Raman spectroscopy, on which oxygen molecules could be transformed to active species for the reaction.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► High surface area Au/CeO2 catalysts are active for formaldehyde oxidation. ► Au+ and Au3+ species provide sites for HCHO adsorption to form formate intermediates. ► AuxCe1−xO2−δ solid solution contains more oxygen vacancies for oxygen activation.

Keywords
Formaldehyde oxidation; Gold catalyst; CeO2; High surface area; AuxCe1−xO2−δ solid solution
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High surface area Au/CeO2 catalysts for low temperature formaldehyde oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 110, 2 November 2011, Pages 279–285
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