Hostname: page-component-cd9895bd7-gvvz8 Total loading time: 0 Render date: 2024-12-27T01:53:48.605Z Has data issue: false hasContentIssue false
  • English
  • Français

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:
[email protected], Università di Padova, Scienze Chimiche, via Marzolo, 1, Padova, 35131, Italy
Alessandro Galenda
Affiliation:
[email protected], Università di Padova, Scienze Chimiche, via Marzolo, 1, Padova, 35131, Italy
Marta Maria Natile
Affiliation:
[email protected], Università di Padova, Scienze Chimiche, via Marzolo, 1, Padova, 35131, Italy
Antonella Glisenti
Affiliation:
[email protected], Università di Padova, Scienze Chimiche, via Marzolo, 1, Padova, 35131, Italy
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

[1] Rebellato, J. Natile, M. M. Glisenti, A. Appl. Catal. A 339 (2008) 108.Google Scholar
[2] Natile, M. Boccaletti, G. Glisenti, A. Chem. Mater. 17 (2005) 6272.Google Scholar
[3] NIST X-ray Photoelectron Spectroscopy Database - Standard Reference Database 20, Version 3.4 (Web Version)Google Scholar
[4] McIntyre, N. S. Chan, T. C. In Practical Surface Analysis 1, 2nd ed. Briggs, D. Seah, M. P. Eds.; Wiley: Chichester, 1990, Chapter 10.Google Scholar
[5] Argile, C. Rhead, G. E. Surf. Sci. Reports 10 (1989) 277.Google Scholar
[6] Wu, J. C. S. Cheng, Y.-T. J. Catal. 237 (2006) 393.Google Scholar
[7] Pârvulescu, I., Grange, P. Delmon, B.; Catal. Today 46 (1998) 233.Google Scholar