ZEOLITE, ACETONE CONDENSATION, SYNERGY
197
implies that both types of acid sites are spatially close to one
another.
3. Anderson, J. A., and Rochester, C. H., J. Chem. Soc., Faraday Trans. 1
85, 1129 (1989).
4. McManus, J. C., Harano, Y., and Low, M. J. D., Can. J. Chem. 47, 2545
(1969).
Finally, a major difference between alumina and zeolite
comes from the fact that in alumina, the gas phase acetone is
probably involved, whereas on zeolite, condensation occurs
between acetone adsorbed on two different kinds of sites.
The influence of the gas phase is indirect because of the
equilibrium between Acw and the gas phase.
5. Dao, T. V., Kitaev, L. E., Topchieva, K. V., Kubasov, A. A., and Ratov,
A. N., Vestnik Mosk. Universiteta, Khimiya 26, 65 (1971).
ˇ
6. Kubelkova´, L., Cejka, J., and Nova´kova´, J., Zeolites 11, 48 (1991).
7. Kubelkova´, L., and Nova´kova´, J., Zeolites 11, 822 (1991).
8. Bell, V. A., and Gold, H. S., J. Catal. 79, 286 (1983).
9. Xu, T., Munson, E. J., and Haw, J., J. Am. Chem. Soc. 116, 1962 (1994).
ˇ
10. Biaglow, A. I., Sepa, J., Gorte, R. J., and White, D., J. Catal. 151, 373
(1995).
CONCLUSIONS
11. Biaglow, A. I., Gorte, R. J., Kokotailo, G. T., and White, D., J. Catal.
148, 779 (1994).
12. Sepa, J., Lee, C., Gorte, R. J., Kassab, E., Evleth, E. M., Jessri, M.,
Allavena, M., and White, D., J. Phys. Chem. 100, 18515 (1996).
13. Kubelkova, L., Kotria, J., Florian, J., Bolom, T., Fraissard, J., Heribout,
L., and Doremieux-Morin, C., 11th Intern. Congress on Catalysis 101,
761 (1996).
14. Panov, A. G., and Fripiat, J. J., Langmuir. [submitted]
15. Hair, M. L., “Infrared Spectroscopy in Surface Chemistry,” p. 149.
Dekker, New York. 1967.
16. Hong, Y., Gruver, V., and Fripiat, J. J., J. Catal. 161, 766 (1996).
17. Gruver, V., Panov, A., and Fripiat, J. J., Langmuir 12, 2505 (1996).
18. Blumenfeld, A. L., Coster, D., and Fripiat, J. J., J. Phys. Chem. 99, 1581
(1995).
19. Blumenfeld, A. L., and Fripiat J. J., Topics in Catalysis 4, 119 (1997).
20. Farcasiu, D., Ghenciu, A., and Miller, G., J. Catal. 134, 118 (1992).
21. Hong, Y., and Fripiat, J. J., Microporous Materials 4, 323 (1995).
22. Hong, Y., Gruver, V., and Fripiat, J. J., J. Catal. 150, 421 (1994).
23. Coster, D., and Fripiat, J. J., Chem. Materials 5, 1204 (1993).
24. Yin, F., Blumenfeld, A. L., Gruver, V., and Fripiat, J. J., J. Phys. Chem.
B. 101, 1824 (1997).
The condensation of acetone on mesityl oxide is a bi-
molecular reaction between acetone activated on a Lewis
site and acetone adsorbed on bridging OH zeolites. The
turnover per Lewis sites is on the order of 10ꢂ3 reactions
per site and per second at 105ꢀC, and it is constant for all
zeolites. On alumina, it seems that the reaction occurs be-
tween a molecule in the gas phase and a molecule activated
on a Lewis site. In addition, the condensation goes further
than mesityl oxide.
ˇ
On zeolites and at 105ꢀC, the extent of the further
condensation reaction is much smaller. On both zeolites
with nonframework aluminum and alumina, the catalyst
gets “product poisoned” by MO and, also, perhaps, by
water.
ACKNOWLEDGMENTS
25. Coster, D., Blumenfeld, A. L., Gruver, V., and Fripiat, J. J., J. Phys.
Chem. 98, 6201 (1994).
26. Gruver, V., and Fripiat, J. J., J. Phys. Chem. 98, 8549 (1994).
27. Panov, A. G., Gruver, V., and Fripiat, J. J., J. Catal. 168, 321
(1997).
This work has been made possible by DOE grant DOE-FG02-90
ER1430. We want to thank the referees for interesting comments.
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