Artículos de revistas
Examination Of The Surface Chemistry Of Activated Carbon On Enantioselective Hydrogenation Of Methyl Pyruvate Over Pt/c Catalysts
Registro en:
Journal Of Molecular Catalysis A: Chemical. , v. 179, n. 1-2, p. 243 - 251, 2002.
13811169
10.1016/S1381-1169(01)00383-1
2-s2.0-0037127510
Autor
Fraga M.A.
Mendes M.J.
Jordao E.
Institución
Resumen
Pt/C catalysts were prepared on oxidized activated carbons. Different oxidation treatments were used both in liquid and gas phase using HNO3 and 5% O2/N2 as the respective oxidizing agents. Thus, different surface chemical properties were achieved. The enantioselective hydrogenation of methyl pyruvate with (-)-cinchonidine as modifier revealed that the catalytic activity is dependent on the concentration of the surface oxygen remaining after activation as measured by XPS. It is suggested that it is a result of the increase in the carbon hydrophilicity that would enable the reactants to go through the catalyst. It is also suggested that the active sites created by the decomposition of the functional groups would allow hydrogen chemisorption and, therefore, the C=O polarization via hydrogen bond interaction. The chemical nature of the surface functional groups did not seem to influence either the catalytic activity or enantioselectivity. © 2002 Elsevier Science B.V. All rights reserved. 179 1-2 243 251 Margitfalvi, J.L., Tálas, E., Tfirst, E., Kumar, C.V., Gergely, A., (2000) Appl. Catal. A, 191, p. 177 Augustine, R.L., Tanielyan, S.K., (1996) J. Mol. Catal. A, 112, p. 93 Augustine, R.L., Tanielyan, S.K., Doyle, L.K., (1993) Tetrahedron, 4, p. 1803 Blaser, H.U., Jalett, H.P., Wehrli, J.T., (1991) J. Mol. Catal. A, 68, p. 215 Bond, G., Meheux, P.A., Ibbotson, A., Wells, P.B., (1991) Catal. Today, 10, p. 371 Wehrli, J.T., Baiker, A., Monti, D.M., Blaser, H.U., (1990) J. Mol. Catal. A, 61, p. 207 Wehrli, J.T., Baiker, A., Monti, D.M., Blaser, H.U., (1989) J. Mol. Catal. A, 49, p. 195 Farkas, G., Hegedüs, L., Tungler, A., Máthé, T., Figueiredo, J.L., Freitas, M.M.A., (2000) J. Mol. Catal. A, 153, p. 215 Schwalm, O., Weber, J., Minder, B., Baiker, A., (1995) J. Mol. Struct. (Theochem), 330, p. 353 Schwalm, O., Weber, J., Minder, B., Baiker, A., (1994) Int. J. Quantum Chem., 52, p. 191 Schwalm, O., Weber, J., Margitfalvi, J., (1993) J. Mol. Struct., 297, p. 285 Coloma, F., Sepúlveda-Escribano, A., Fierro, J.L.G., Rodríguez-Reinoso, F., (1997) Appl. Catal. A, 150, p. 165 Radovic, L.R., Rodríguez-Reinoso, F., (1997) Chemistry and Physics of Carbon, 25. , P.A. Thrower (Ed.), Marcel Dekker, New York Rodríguez-Reinoso, F., (1998) Carbon, 36, p. 159 Baiker, A., Blaser, H.U., (1997) Handbook of Heterogeneous Catalysis, 5, p. 2422. , G. Ertl, H. Knözinger, J. Weitkamp (Eds.) Rodríguez-Reinoso, F., Martin-Martinez, J.M., Prado-Burgete, C., McEnamey, B., (1987) J. Phys. Chem., 91, p. 515 Figueiredo, J.L., Pereira, M.F.R., Freitas, M.M.A., Órfão, J.J.M., (1999) Carbon, 37, p. 1379 Ikeo, N., Iijma, Y., Niima, N., Sigematsu, M., Tazawa, T., Matsumoto, S., Kojima, K., Nagsawa, Y., (1991) Handbook of X-ray Photoelectron Spectroscopy JEOL Desimoni, E., Casella, G.I., Morone, A., Salvi, A.M., (1990) Surf. Interface Anal., 15, p. 627 Zeike, U., Hüttinger, K.J., Hoffman, W.P., (1996) Carbon, 34, p. 983 Silva, A.B., Jordão, E., Mendes, M.J., Fouilloux, P., (1997) Appl. Catal. A, 148, p. 253 Costa, C.M.M., Jordão, E., Mendes, M.J., Santos, O.A.A., Bozon-Verduraz, F., (1999) React. Kinet. Catal. Lett., 66, p. 155 Coupé, J.N., Jordão, E., Fraga, M.A., Mendes, M.J., (2000) Appl. Catal. A, 199, p. 45 Román-Martínez, M.C., Cazola-Amorós, D., Linares-Solano, A., Salinas-Martínez de Lecea, C., (1993) Carbon, 31, p. 895 De Miguel, S.R., Scelza, O.A., Román-Martínez, M.C., Salinas-Martínez de Lecea, C., Cazorla-Amorós, D., Linares-Solano, A., (1998) Appl. Catal. A, 170, p. 93 Fraga, M.A., (2000), D.Sc. Thesis, UNICAMP, Campinas, BrazilTreptan, M.H., Miller, D.J., (1991) Carbon, 29, p. 531 Román-Martínez, M.C., Cazola-Amorós, D., Linares-Solano, A., Salinas-Martínez de Lecea, C., (1996) Langmuir, 12, p. 379