Efeito da preparação nos sítios de cromo....pdf

__________________________________________________________________Referências Bibliográficas
61 - Jozwiak, W. K., Dalla Lana, I. G. e Fiedorow, R., “On the role of surface hydroxyls
during the Cr/SiO2-catalyzed polymerization of ethylene”, J. Catal., 121 (1),
183-195, 1990.
62 - Hogan, J. P., “Ethylene polymerization catalysis over chromium oxide”, J. Pol. Sci.
A1, 8 (9), 2637-&, 1970.
63 - Weckhuysen, B. M. , Wachs, I. E. e Schoonheydt, R. A. in G. Poncelet, P. A.
Jacobs, P. Grange, B. Delmon (Ed.), Preparation of Catalysts VI, Elsevier,
Amsterdan, 1995, p. 151.
64 - Hogan, J. P., "Catalysis of the Phillips Petroleum Company polyethylene process",
Appl. Ind. Catal. 1, 149-176, 1983.
65 - Przhevalskaya, L. K., Shvets, V. A. e Kazanski, V. B., “Study of active-centers of
ethylene polymerization over chromium catalysts prepared from trivalent and
bivalent chromium compounds”, J. Catal., 39, 363-368, 1975.
66 - Zecchina, A., Spoto, G., Ghiotti, G. e Garrone, E., “Cr 2+ ions grafted to silica and
silicalite surfaces: FTIR characterizantion and ethylene polymerization activity”,
J. Mol. Catal., 86, 423-446, 1994.
67 - Finch, J. N., “Reduction studies on supported chromic anhydride catalysts”, J.
Catal., 43, 111, 1976.
68 - Ruddick, V. J. e Badyal, J. P. S., “CO reduction of calcined CrOx/SiO2 ethene
polymerization catalyst”, Langmuir, 13, 469-472, 1996.
69 - Krauss, H. L. e Stach, H., “Surface compounds of transition metals. 4.
Polymerization reactions on surface compounds of chromium (2)”, Z. Anorg.
Allg. Chem., 366 (5-6), 280-&, 1969.
70 - Krauss, H. L., “Reactions on coordinatively unsaturated chromium (II) surface
compounds”, Angew Chem. Int. Edit., 12 (10), 861-861, 1973.
71 - Weckhuysen, B. M., Wachs, I. E. e Schoonheydt, R. A., “Spectroscopic
characterization of supported Cr and Cr,Ti catalysts: interaction with probe
molecules”, Preparation of Catalysts VI, in G. Poncelet, P. A. Jacobs, P. Grange
e B. Delmon (Editores), 151-158, 1995.
72 - Bensalem, A., Wechhuyse, B. M. e Schoonheydt, R. A., “In situ diffuse reflectance
spectroscopy of supported chromium oxide catalysts: kinetics of the reduction
process with carbon monoxide”, J. Phys. Chem., 101, 2824-2829, 1997.
207