Actas de congresos
Effects Of The Addition Of Nb2o5 To Rhenium-based Olefin Metathesis Catalysts
Registro en:
Journal Of Molecular Catalysis A: Chemical. , v. 115, n. 1, p. 173 - 181, 1997.
13811169
10.1016/S1381-1169(96)00099-4
2-s2.0-0031026970
Autor
Buffon R.
Jannini M.J.D.M.
Abras A.
Institución
Resumen
The effects of the addition of Nb2O5 to 6 wt.% Re2O7/Al2O3 metathesis catalysts were investigated. At least until 9 wt.% Nb2O5 loadings both tetrahedral and octahedral aluminum sites are evenly involved in the reaction between alumina and niobium oxide. Up to 12 wt.% Nb2O5 no significative influence wits observed in the catalytic activity of the resulting systems. For higher niobia loadings, however, the catalytic activity decreased quickly. In such conditions a second rhenium species, probably [Nb]-OReO3 was detected by TPR. 119Sn Mossbauer analyses showed that the reaction between the niobia-modified systems and SnBu4 ([Sn]:[Re] = 0.55) led to the formation of only one kind of rhenium-tin site, with the tin atom attached to the surface by two Sn-O bonds. In contrast to what happens with the unmodified system, no physisorbed SnBu4 was observed. 115 1 173 181 Nakamura, R., Echigoya, E., (1977) Recl. Trav. Chim. Pays-Bas, 96, pp. M31 Xu, X., Imhoff, P., Van Den Aardweg, G.C.N., Mol, J.C., (1985) J. Chem. Soc., Chem. Commun., p. 273 Nakamura, R., Echigoya, E., (1977) Chem. Lett., p. 1227 Xu, X., Boelhouwer, C., Benecke, J.I., Vonk, D., Mol, J.C., (1986) J. Chem. Soc., Faraday Trans. 1, 82, p. 1945 Xu, X., Mol, J.C., (1985) J. Chem. Soc., Chem. Commun., p. 631 Xu, X., Mol, J.C., Boelhouwer, C., (1986) J. Chem. Soc., Faraday Trans. 1, 82, p. 2707 Verkuijlen, E., Kapteijn, F., Mol, J.C., Boelhouwer, C., (1977) J. Chem. Soc., Chem. Commun., p. 198 Hermann, W.A., Wagner, W., Flessner, U.N., Volkhardt, U., Komber, H., (1991) Angew. Chem., Int. Ed. Engl., 30, p. 1636 Buffon, R., Auroux, A., Lefebvre, F., Leconte, M., Choplin, A., Basset, J.-M., Herrmann, W.A., (1992) J. Mol. Catal., 76, p. 287 Buffon, R., (1992), Ph.D. Thesis, Université Claude-Bernard - Lyon 1, FranceDatka, J., Turek, A.M., Jehng, J.M., Wachs, I.E., (1992) J. Catal., 135, p. 186 Herrmann, W.A., Kuchler, J.G., Weichselbaumer, G., Herdtweck, E., Kiprof, P., (1989) J. Organomet. Chem., 372, p. 351 Buffon, R., Schuchardt, U., Abras, A., (1995) J. Chem. Soc., Faraday Trans., 91, p. 3511 Nédez, C., Lefebvre, F., Choplin, A., Niccolai, G.P., Basset, J.-M., Benazzi, E., (1994) J. Am. Chem. Soc., 116, p. 8638 Nédez, C., Théolier, A., Lefebvre, F., Choplin, A., Basset, J.-M., Joly, J.F., (1993) J. Am. Chem. Soc., 115, p. 722 Nédez, C., Choplin, A., Lefebvre, F., Basset, J.-M., Benazzi, E., (1994) Inorg. Chem., 33, p. 1099 Mitchell, T.N., (1973) J. Organomet. Chem., 59, p. 189 Smith, P.J., White, R.F.M., Smith, L., (1972) J. Organomet. Chem., 40, p. 341 Zuckerman, H.J., (1984) Chemical Mössbauer Spectroscopy, p. 267. , R.H. Herber (Ed.), Plenum, New York Nédez, C., Lefebvre, F., Choplin, A., Basset, J.-M., Benazzi, E., (1994) J. Am. Chem. Soc., 116, p. 3039 Davies, A.G., Smith, P.J., (1982) Comprehensive Organometallic Chemistry, 2, p. 523. , G. Wilkinsom, F.G.A. Stone and E.W. Abel (Eds.), Pergamon, Oxford Sibeijn, M., Mol, J.C., (1991) Appl. Catal., 67, p. 279 Spronk, R., Van Veen, J.A.R., Mol, J.C., (1993) J. Catal., 144, p. 472 Kapteijn, F., Bredt, L.H.G., Mol, J.C., (1977) Recl. Trav. Chim. Pays-Bas, 96, pp. M139 Xu, X., Benecke, J.I., Boelhouwer, C., Mol, J.C., (1986) Appl. Catal., 28, p. 271 Ellison, A., (1990) Olefin Metathesis and Polymerization Catalysts, p. 335. , Y. Imamoglu, B. Zümreoglu-Karan and A.J. Amass (Eds.), Kluwer, Dordrecht Turek, A.M., Decanio, E., Wachs, I.E., (1992) J. Phys. Chem., 96, p. 5000 Sibeijn, M., Spronk, R., Van Veen, J.A.R., Mol, J.C., (1991) Catal. Lett., 8, p. 201 Vuurman, M.A., Stufkens, D.J., Oskam, A., Wachs, I.E., (1992) J. Mol. Catal., 76, p. 263 Jehng, J.M., Wachs, I.E., (1992) Appl. Catal. A, 83, p. 179 Kim, D.S., Wachs, I.E., (1993) J. Catal., 141, p. 419 Xu, X., Vonk, D., Mol, J.C., (1986) Termochimica Acta, 105, p. 135