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Spectroscopic characterization of gold supported on tungstated zirconia

Paper ID Volume ID Publish Year Pages File Format Full-Text
55379 47050 2012 9 PDF Available
Title
Spectroscopic characterization of gold supported on tungstated zirconia
Abstract

Gold catalysts supported on tungstated zirconia (containing 5–20 wt% WO3) are prepared by cationic adsorption from aqueous solution of [Au(en)2]Cl3 complex. The materials are characterized by XRD, DR-UV–vis spectroscopy and XPS. The nature of the deposited gold species is studied by FT-IR spectroscopy of adsorbed CO. It is concluded that the gold particles occupy preferentially the WOx-free zirconia surface and the dispersion of gold depends on the amount of coodinatively unsaturated (cus) Zr4+ ions. Modification of zirconia by tungsten increases the gold uptake but at the same time causes decrease in the concentration of (cus) Zr4+ ions thus lowering the dispersion of gold clusters. According to the results of in situ FT-IR spectroscopy, the Au/WOxZrO2 catalysts display higher activity in the CO oxidation in the low-temperature range (up to 150 °C) than the WOx-free Au/ZrO2 sample. The low-temperature activity of the W-containing catalysts could be associated with decreased basicity of the support oxide ions resulting in reduced accumulation of stable carbonate species.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (146 K)Download as PowerPoint slideHighlights► Gold supported on tungstated zirconia. ► Synthesis by cationic adsorption from aqueous solution of [Au(en)2]Cl3. ► Effect of WOx species on the nature and dispersion of gold nanoclusters. ► FT-IR spectroscopic investigation of the CO + O2 surface reaction. ► Improved resistance toward formation of stable carbonate–carboxylate surface structures.

Keywords
Gold supported on tungstated zirconia; XRD; DR-UV–vis spectroscopy; XPS; In situ FT-IR spectroscopy of adsorbed CO and CO + O2
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 187, Issue 1, 30 June 2012, Pages 39–47
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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Price after discount Only $4.95
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