__________________________________________________________________Referências Bibliográficas 73 - Gaspar, A. B. e Dieguez, L. C., "The influence of Cr precursors in the ethylene polymerization on Cr/SiO2 catalysts", Appl. Catal. A: Gen., 227(2) 2002 (em impressão). 74 - Borello, E., Zecchina, A., Morterra, C. e Ghiotti, G., “Infrared study of carbon monoxi<strong>de</strong>, oxygen and carbon dioxi<strong>de</strong>. Adsorption on chromia-silica. I. carbon monoxi<strong>de</strong>”, J. Phys. Chem., 73(5), 1286-1291, 1969. 75 - Garrone, E., Ghiotti, G. e Zecchina, A., “Coordination chemistry of silica supported Cr ions: types of Cr(II) ions on reduced samples”, Olefin Metathesis and polymerization catalysts, in Y. Imamoglu (Editor), Kluwer Aca<strong>de</strong>mic Publishers, 393-406, 1990. 76 - Zecchina, A., Garrone, E., Ghiotti, G. e Coluccia, S., “On the chemistry of silica supported chromium ions. II. One-ligand complexes. Adsorption of carbon monoxi<strong>de</strong>, carbon dioxi<strong>de</strong>, and pyridine”, J. Phys. Chem., 79(10), 972-977, 1975. 77 - Gaspar, A. B., Schmal, M., Silveira, L. S., Forte, M. M. C. e Dieguez, L. C., “<strong>Efeito</strong> <strong>da</strong>s condições <strong>de</strong> preparo na formação <strong>de</strong> <strong>sítios</strong> ativos para polimerização <strong>de</strong> etileno em Cr/SiO2”, 16 0 Simp. Iber. Catal., vol. 1, 1991, 1998. 78 - Fubini, B., Ghiotti, G., Stra<strong>de</strong>lla, L., Garrone, E. e Morterra, C., “The chemistry of silica-supported Cr ions: a characterization of the reduced and oxidized forms of chromia/silica catalyst by calorimetry and ultraviolet-visible spectroscopy”, J. Catal., 66, 200-213, 1980. 79 - Garrone, E., Ghiotti, G., Morterra, C. e Zecchina, A., “The chemistry of sílica supported chromium íons nitric-oxi<strong>de</strong> complexes and their interaction with CO and pyridine”, Z. Naturforsch B, 42 (6), 728-738, 1987. 80 - Zecchina, A., Coluccia, S., Guglielminotti, E. e Ghiotti, G., “Ifrared study of surface properties of alpha-chromia. 1. Preparation and adsorption of water, heavy water and carbon monoxi<strong>de</strong>, J. Phys. Chem., 75 (18), 2774-& , 1971. 81 - Parker, S. F., Riley, C. C. A. e Baker, J. E., "Investigation of a Cr/Silica polyethylene catalyst by in-situ infrared spectroscopy", Studies in surface science and catalysis 130 (A. Corma, F. V. Melo, S. Mendioroz e J. L. G. Fierro, Eds.), 3843-3848, Elsevier, 2000. 208
__________________________________________________________________Referências Bibliográficas 82 - McDaniel, M. P. e Martin, S. J., “Poisoning studies on Cr/silica. 2. Carbon monoxi<strong>de</strong>”, J. Phys. Chem., 95, 3289-3293, 1991. 83 - Rieck, J. S. e Bell, A. T., “The influence of dispersion on the interactions of H2 and CO with Pd/SiO2”, J. Catal., 103 (1), 46-54, 1987. 84 - Xu, C., Hassel, M, Kuhlenbeck, H. e Freund, H.-J, "Adsorption and reaction on oxi<strong>de</strong> surfaces: NO, NO2 on Cr2O3(111)/Cr(110)", Surf. Sci., 258, 23-34, 1991. 85 - Ba<strong>de</strong>, O. M., Blom, R., Dahl, I. M. e Karlsson, A., “A DRIFTS study of the Cr(II)/SiO2 catalyst - Ethylene coordination and early stages of polymerisation”, J. Catal. 173 (2), 460-469, 1998. 86 - Ghiotti, G, Garrone, E. e Zecchina, A., “IR investigation of polymerization centers of the Phillips catalyst”, J. Mol. Catal. A, 46 (1-3), 61-77, 1988. 87 - Kim, C. S., Woo, S. I.,, Jeong, D. J. e Oh, J. S., “Comparison of ethylene polymerization catalyzed over Cr(VI)/silica and Cr(II)/silica catalysts”, Pol. Bull., 29, 205-212, 1992. 88 - Carrick, W. L., Turbett, R. J., Karol, F. J., Karapinka, G. L., Fox, A. S. e Johnson, R. N., “Ethylene polymerization with supported bis(triphenylsilyl) chromate catalysts”, J. Pol. Sci. A-1, 10, 2609-2620, 1972. 89 - Zielinski, P. e Dalla Lana, I. G., “An FTIR spectroscopic view of the initiation of ethylene polymerization on Cr/SiO2 catalyst”, J. Catal., 137, 368-376, 1992. 90 - Kantcheva, M., Dalla Lana, I. G. e Szymura, J. A., “Spectroscopic investigation of the initiation of ethylene polymerization on Cr/Silica”, J. Catal., 154, 329-334, 1995. 91 - Groeneveld, C., Wittgen, P. P. M. M., Swinnen, H. P., Wernsen, A. e Schuit, G. C. A., “Hydrogenation of olefins and polymerization of ethene over chromium oxi<strong>de</strong>/silica catalysts V. In situ infrared measurements and investigation of the polymer”, J. Catal., 83, 346-361, 1983. 92 - Vikulov, K., Spoto, G., Coluccia, S. e Zecchina, A., “FTIR investigation of ethylene coordination and polymerization on reduced Cr/SiO2 catalyst”, Cat. Lett., 16, 117-122, 1992. 93 - Ba<strong>de</strong>, O. M., Blom, R., "Polymerisation of ethylene with t-BuLi modified Cr(II)/SiO2 catalyst", Appl. Catal. A:Gen., 161, 249-262, 1997. 209
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