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252 Copyright 0 1977 by Academic Press, Inc. All rights of reproduction in any form reserved.
includ(ld rare>-earth-exchanged X and hydrogcn Y. Expcrimcnts wcrc conducted both in hydrogen and nitrogen or helium with n-hexadecane or cyclohcxene as the feed.
a Initial activity, b 0.3 LHSV.
3CsH1o + G-H, + 2CsH12. Instead of attributing the excess yield of methylcyclopentane to the hydrogenation activity, it is more likely that the extra hydrogen came from hydrogen transfer and condensation reactions which yielded unsaturates of higher molecular weights that remained on the catalysts, since continuous catalyst aging was observed at 1 atm. C. Comparison of Products with Those from Conventional Hydrocracking Marked differences in the hydrocracked product distribution have been observed depending on the strength of the hydrogenation function (17). Shown in Fig. 1 is a comparison of the results of the present study with those of hydrocracking n-hexadecane over a Pt/SiAl catalyst and a NiS/SiAl catalyst. The similarity between the product distribution of REX andNiS/ SiAl suggests that the rare-earth ions also serve as a weak hydrogenation function like NiS.
the catalytic process because large variations in catalyst activity depended upon the type of cations in the zcolite rather than the iron concentration. However, more recent studies indicated that the oxidation state of a reducible metal ion in a zeolite depends on the acidity of the zeolite (29). For example, nickel ion in a Na zeolite is easily reducible, while nickel ion in a hydrogen zeolite is not easily reduced. Similarly, the state of trace iron and its hydrogenation activity may also depend on the cationic form of the zeolite. Thus, the role of iron, though it may be minor, cannot bc definitively ruled out without further experimentation. ACKNOWLEDGMENTS We wish to acknowledge the many helpful discussions we had with Dr. W. 0. Haag of this laboratory, and we also thank E. J. Rosinski who supplied the catalyst,s. REFERENCES 1. Minachev, Kh. M., Shchukina, M. A., and Dimitriev, R. V., 37 (1968). 2. Minachev, Kh. M., Garanin, T. A., and Kharlamov, V.
V. I., Isakova, V., Izv. Akad. Nauk SSSR Ser. Khim. 2,481 (1969). 3. Minachev, Kh. M., Garanin, V. I., Kharlamov, V. V., Isakova, T. A., and Senderov, E. E., Izv. Akad.
(1969). 4. Minachev, Kh. M., Garanin, V. I., Isakova, T. A., Kharlamov, V. V., and Bogomolov, V., Advan. Chem. Ser. 102, 441 (1971). 5. Minachev, Kh. M., Garanin, V. I., Kharlamov, V. V., and Isakova, T. A., Kinet. Katal. 13, 1101 (1972).
6. Udaltsova, E. A., Levitskii, I. I., and Minachev, Kh. M., Izv. Akad. Nauk SSSR Ser. Khim. 10, 2378 (1975). 7. Topochieva, K. V., Shakhnovskaya, 0. L., Rosolovskaya, E. N., Zhadanov, S. P., and Samulevich, N. N., Kinet. Katal. 13, 1453 (1972). 8. Kharlamov, V. V., Garanin, V. I., Tagiev, D. B., Minachev, Kh. M., and Goryachev, A. A., Izv. Akad.
(1975). 9. Kharlamov, V. V., Garanin, V. I., Tagiev, D. B., Minachev, Kh. M., and Goryachev, A. A., Izv. Akad. (1975).
10. Garanin, V. I., Minachev, Kh. M., Kharlamov, V. V., and Tagiev, D. B., Izv. Akad. Nauk SSSR Ser. Khim. 11, 2410 (1975).
Minachev, Kh. M., Garanin, V. I., Kharlamov, V. V., and Kapustin, M. A., Izv. Akad. Nauk SSSR Ser. Khim. 7, 1554 (1974). 1.2. Karakhanov, R. A., Garanin, V. I., Kharlamov, V. V., Kapustin, M. A., Blinov, B. B., and Minachev, Kh. &!I., Izv. Akad. Nauk SSSR Ser. Khim. 2, 445 (1975). 13. Minachev, Kh. M., Garanin, V. I., Kharlamov, V. V., and Kapustin, M. A., Izv. Akad. Nauk SSSR Ser. Khim. 12, 2673 (197.5). 14. Beaumont, R., and Barthomeuf, D., C. R. Acad. Sci. Paris Ser. C 269, 617 (1969). 15. Kerr, G. T., J. Catal. 15, 200 (1969). 16. Chen, N. Y., and GaIwood, W. E., Advan. Chem. Ser. 121, 575 (1973). 17. Langlois, G. E., and Sullivan, R. F., Advan. Chem. Ser. 97, 38 (1970). 18. We& P. B., Advan. Catal. 13, 137 (1962). 19. Coonradt, H. L., and Garwood, W. E., Ind. Eng. Chem. Process Des. Develop. 3, 38 (1964). 20. Nate, 1). M., Ind. Eng. Chem. Prod. Res. Develop. 8, 31 (1969). 21. Nate, I). M., Ind. Eng. Chem. Prod. Res. Develop. 8, 24 (1969). 22. Riekert, L., Ber. Bunsenges. Phys. Chem. 73, 331 (1969). il.
Report "The promotional effect of hydrogen on the catalytic properties of rare-earth zeolites"

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