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CuxO/CeO2 Nanocomposites: Synthesis and Reactivity with NO

Published online by Cambridge University Press:  01 February 2011

Federico Scopel ,
Alessandro Galenda ,
Marta Maria Natile  and
Antonella Glisenti
Federico Scopel
Affiliation:
airfede@libero.it, Università di Padova, Scienze Chimiche, via Marzolo, 1, Padova, 35131, Italy
Alessandro Galenda
Affiliation:
alessandro.galenda@unipd.it, Università di Padova, Scienze Chimiche, via Marzolo, 1, Padova, 35131, Italy
Marta Maria Natile
Affiliation:
martamaria.natile@unipd.it, Università di Padova, Scienze Chimiche, via Marzolo, 1, Padova, 35131, Italy
Antonella Glisenti
Affiliation:
antonella.glisenti@unipd.it, Università di Padova, Scienze Chimiche, via Marzolo, 1, Padova, 35131, Italy
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Abstract

CuxO/CeO2 nanocomposite powders were prepared by wet impregnation of nanosized ceria powder (Cu/Ce nominal atomic ratio from 0.05 to 0.5). XP analysis reveals the presence of Cu2O in the samples with lower Cu/Ce atomic ratio whereas CuO is prevalent in the samples richer in copper. The surface Cu/Ce atomic ratio obtained from XPS data is always higher than the nominal one suggesting the surface segregation of copper. A plateau value (0.9-1.0) is reached for the samples with a nominal Cu/Ce atomic ratio of 0.2 suggesting an island growing mechanism.

The nanocomposite samples and the supporting ceria were exposed to a NO+CO mixture (2% CO, 2% NO, 96% He) and the reactivity was investigated by means of DRIFT spectroscopy and QMS. At 523 K (i.e. the temperature at which the nanocatalysts activity is higher) the capability for NO reduction increases with increasing the Cu/Ce atomic ratio.

Keywords

nanoscaleCeCu
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1074: Symposium I – Synthesis and Metrology of Nanoscale Oxides and Thin Films , 2008 , 1074-I03-39
Copyright
Copyright © Materials Research Society 2008

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References

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