QuantitativemeasurementsofCOchemisorptionintherange140–180K,supportedbyFTIRdataonadsorbedCO,wereperformedonAu/TiO2, Au/Fe2O3,andAu/CeO2 catalysts. On the first two samples, which had similar particle size distributions, an average Au/CO chemisorption stoichiometryofabout3,referredtostep-edgeAuatoms,wasfound.OnAu/CeO2,whereverysmallclustersandquitelargeparticlesarepresent, the CO-chemisorbed volume was much higher than expected, due to the prevailing contribution of very small Au clusters. On the same sample, a change in the IR absorption coefficient was observedand was reasonably explained. © 2005Elsevier Inc. All rights reserved.

Quantitative determination of gold active sites by chemisorption and by infrared measurements of adsorbed CO

MENEGAZZO, FEDERICA;SIGNORETTO, Michela;PINNA, Francesco;
2006-01-01

Abstract

QuantitativemeasurementsofCOchemisorptionintherange140–180K,supportedbyFTIRdataonadsorbedCO,wereperformedonAu/TiO2, Au/Fe2O3,andAu/CeO2 catalysts. On the first two samples, which had similar particle size distributions, an average Au/CO chemisorption stoichiometryofabout3,referredtostep-edgeAuatoms,wasfound.OnAu/CeO2,whereverysmallclustersandquitelargeparticlesarepresent, the CO-chemisorbed volume was much higher than expected, due to the prevailing contribution of very small Au clusters. On the same sample, a change in the IR absorption coefficient was observedand was reasonably explained. © 2005Elsevier Inc. All rights reserved.
2006
237
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10278/30386
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