4
62
GUCZI ET AL.
styrene. In the case of Cu metal, dilution of the palla- 10. Boitiaux, J. P., Cosyns, J., and Vasudevan, S., Appl. Catal. 6, 41 (1983).
1
1
1
1. Gigola, C. E., Aduriz, H. R., and Bodnariuk, P., Appl. Catal. 27, 133
dium surface atoms is claimed to be responsible for the
decreased activity and the ensemble size variation deter-
mines the increased selectivity to styrene with respect to
the monometallic catalyst.
(
1986).
2. Duca, D., Frusteri, F., Parmaliana, A., and Deganello, G., Appl. Catal.
A 146, 269 (1996).
3. Guczi, L., J. Mol. Catal. 25, 13 (1984).
During the hydrogenation and isomerization of but-1- 14. Sachtler, W. M. H., J. Mol. Catal. 25, 1 (1984).
1
1
1
1
1
5. Moss, R. L., Pope, D., Davis, B. J., and Edwards, D. H., J. Catal. 58,
ene, addition of copper as oxide produces a consistent low-
ering of the hydrogenation activity and an increase in iso-
merization selectivity, whereas metallic copper, free and in
an alloyed state with Pd, restores the hydrogenation ac-
tivity and still maintains the higher selectivity with respect
to a monometallic catalyst. Electronic effects determined
by the CuO and ensemble size variations are considered
responsible for the two behaviours.
206 (1979).
6. Furlong, B. K., Hightower, J. W., Chan, T. Y.-L., Sarkany, A., and
Guczi, L., Appl. Catal. A 117, 41 (1994).
7. Petr o´ , J., Mall a´ t, T., Tungler, A., Math e´ , T., and Poly a´ nszky, E., “Het-
erogeneous Catalysis and Fine Chemicals III,” p. 267, 1993.
8. Benedetti, A., Fagherazzi, G., Pinna, F., Rampazzo, G., Selva, M., and
Strukul, G., Catal. Lett. 10, 215 (1991).
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159 (1994).
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2
0. Gustafson, B. L., and Wehner, P. S., Appl. Surf. Sci. 52, 261 (1991).
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A., J. Catal. 150, 127 (1994).
ACKNOWLEDGMENTS
The authors acknowledge CNR (Consiglio Nazionale delle Ricerche)
and MTA (Hungarian Academy of Science) for the bilateral program
grant. The CNR is also acknowledged for the funds provided by the
2
2
2. Duca, D., Liotta, L. F., and Deganello, G., J. Catal. 154, 69 (1995).
3. Venezia, A. M., Floriano, M. A., Deganello, G., and Rossi. A., Surf.
Interface Anal. 18, 532 (1992).
“
Progetto Finalizzato M.S.T. A.-II.”
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