Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12857/142626
Title: Au/CeO<inf>2</inf> supported nanocatalysts: Interaction with methanol
Authors: Glisenti, Antonella 
Frasson, Andrea
Galenda, Alessandro
Maria Natile, Marta
Keywords: Catalysis;Ceria;Gold;Methanol Oxidation;Nanocomposites
Keywords Plus: WATER-GAS SHIFT;CO OXIDATION REACTION;GOLD-CERIA CATALYSTS;SELECTIVE OXIDATION;METAL-OXIDES;REACTIVITY;OXYGEN;POWDERS;SURFACE;STABILIZATION
Issue Date: 1-Sep-2010
Publisher: AMER SCIENTIFIC PUBLISHERS
Journal: Nanoscience and Nanotechnology Letters 
Abstract: 
The effect of preparation procedure (Direct Anionic Exchange, DAE, Deposition-Precipitation, DP, and wet Impregnation, IMP) and Au/Ce atomic ratio (0.018 and 0.066) on Au/CeO2 supported nanocatalysts was investigated with respect to reactivity. XPS data suggest the presence of traces of Ce(III). Usually, gold is present as Au(0) but in the DAE sample with high Au content, traces of oxidized species are observed. The Au/Ce XPS atomic ratio is lower than the expected value. Au deposition decreases surface interaction with atmospheric moisture and carbon dioxide. Methanol interacts molecularly and dissociatively with the samples; methoxy groups are observed to be monocoordinated at Ce(IV) at room temperature and bi-coordinated to Ce(IV) and Ce(III) at increasing temperature. Oxidation products (formates, carbonates, carbon dioxide) form at temperatures higher than 373-423 K; activity and selectivity in methanol oxidation reaction are influenced by the metal content and the preparation procedure. Copyright © 2010 American Scientific Publishers.
URI: http://hdl.handle.net/20.500.12857/142626
ISSN: 19414900
DOI: 10.1166/nnl.2010.1085
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