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CO oxidation studies over cluster-derived Au/TiO2 and AUROlite™ Au/TiO2 catalysts using DRIFTS

Paper ID Volume ID Publish Year Pages File Format Full-Text
54846 47028 2013 10 PDF Available
Title
CO oxidation studies over cluster-derived Au/TiO2 and AUROlite™ Au/TiO2 catalysts using DRIFTS
Abstract

Thiol-ligated Au38(SC12H25)24 clusters were synthesized and supported on a microporous TiO2 support by incipient wetness impregnation. After a reductive pretreatment designed to remove the thiol ligands, the activity of catalyst was tested using CO oxidation in a fixed-bed reactor at 30 and 60 °C. CO oxidation was also performed at similar conditions in an in situ FTIR (DRIFTS) cell to monitor the species that were formed during the reaction, and results were compared to commercially available Au/TiO2 catalyst. Our Au/TiO2 was less active than this commercial catalyst for CO oxidation, likely due to the presence of bidentate carbonate species. DRIFTS studies on the commercial catalyst showed strong peaks at 1718 and 1690 cm−1 that are not present in our catalyst. We propose that these bands are due to bridging CO2 between AuTi and AuAu centers formed via direct oxygen atom transfer from the titania surface to AuCO. On the surface of our catalyst, however, a different reaction mechanism involving sulfur-mediated oxygen transfer at the Au-TiO2 interface has been proposed.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (91 K)Download as PowerPoint slideHighlights► Demonstrated synthesis of atomically precise Au38 clusters. ► Showed catalytic effect of residual sulfur on Au/TiO2 catalysis of CO oxidation. ► Presented DRIFTS evidence for reaction mechanism.

Keywords
CO oxidation; Au catalysis; DRIFTS; Au clusters; Au/TiO2
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CO oxidation studies over cluster-derived Au/TiO2 and AUROlite™ Au/TiO2 catalysts using DRIFTS
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 208, 1 June 2013, Pages 72–81
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