Hostname: page-component-78c5997874-dh8gc Total loading time: 0 Render date: 2024-11-17T16:57:20.592Z Has data issue: false hasContentIssue false

Characterization Studies of Copper Supported on a Variety of Carbonaceous Substrates

Published online by Cambridge University Press:  10 February 2011

J. Ma
Affiliation:
Chemical Engineering Department, The Pennsylvania State University, University Park, PA, 16802
N. M. Rodriguez
Affiliation:
Department of Chemistry, Hurtig Hall, Northeastern University, Boston, MA 02115.
M. A. Vannice
Affiliation:
Chemical Engineering Department, The Pennsylvania State University, University Park, PA, 16802
R. T. K. Baker
Affiliation:
Department of Chemistry, Hurtig Hall, Northeastern University, Boston, MA 02115.
Get access

Abstract

Copper catalysts supported on different allotropie forms of carbon, such as activated carbon, graphite, pitch-based carbon fibers and diamond have been prepared and characterized using TPR, XRD, TPO, TEM and CAEM techniques. Preparation procedures were established for each support system and were dependent upon the oxidation characteristics of the particular carbonaceous solid. The ease of the reduction of copper oxide to metallic copper was found to be dependent upon the nature of the carbonaceous supports as well as the possible interactions between these two components. It was postulated that the epitaxial relationship that might exist between metallic copper and the diamond would make it easy for copper oxide to be reduced to its metallic state on this support. Attack of the graphite surface occurs in the presence of copper species in hydrogen at low temperatures. This behavior is rationalized according to the notion that dissociation of molecular hydrogen takes place on Cu2O and the active atomic species “spill-over” onto the graphite and undergo reaction with the π-electrons of the basal plane resulting in the creation of pits in the surface. In-situ electron diffraction highlighted the changes in the chemical state of copper species. Cu2O was found to be stabilized at certain stages of the reaction possibly due to its interaction with the carbonaceous supports. It is suggested that this type of copper species might exhibit some unique catalytic behavioral patterns.

Type
Research Article
Copyright
Copyright © Materials Research Society 1997

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. Thomas, C.L., “Catalytic Processes and Proven CatalystsAcademic Press, New York, (1970).Google Scholar
2. Bridger, G. W. and Spencer, M. S., “Catalysis Handbook”. (Twigg, M. V., Ed.), 2nd. edition, Wolfe, U. K. (1992).Google Scholar
3. Carley, A. F., Rajuman, M. F. and Roberts, M. W., Solid, J. State Chem. 106, 156 (1993).Google Scholar
4. Jirka, I., Surf. Sci. 232, 307 (1990).Google Scholar
5. Nardo, S. D., Lozzi, L., Passacantando, M., Picozzi, P., Santucci, S. and De Crescenzi, M., Surf. Sci. 287, 1087 (1993).Google Scholar
6. Nardo, S. D., Lozzi, L., Passacantando, M., Picozzi, P., Santucci, S. and De Crescenzi, M., Surf. Sci. 307, 922 (1994).Google Scholar
7. Jernigan, G. G. and Somorjai, G. A., J. Catal. 147, 567 (1994).Google Scholar
8. Guarnieri, C. R., d'Heurle, F. M., Cuomo, J. J. and Whitehair, S. J., Appl. Surf. Sci., 53, 115 (1991)Google Scholar
9. Lurie, P. G. and Wilson, J. M., Surf. Sci., 65, 453 (1977)Google Scholar
10. Niu, C-M., Tsagaropoulos, G., Baglio, J., Dwight, K. and Wold, A., J. Sol. State Chem., 91, 47 (1991)Google Scholar
11. Ong, T. P., Xiong, F. and Chang, R. P. H., Appl. Phys. Lett, 60(17), 2083 (1992)Google Scholar
12. Lambrecht, W. R. L., Physica B, 185, 512, (1993)Google Scholar
13. Farcasiu, M. DOE PETC private communicationGoogle Scholar
14. Rodriguez, N. M., Oh, S. G., Downs, W. B., Pattabiraman, P. and Baker, R. T. K.. Rev. Sci. Instrum. 61, 1863 (1990).Google Scholar
15. Rodriguez, N. M. and Baker, R. T. K., J. Catal. 140, 287 (1993).Google Scholar