Mössbauer Study Of 119sn-pd Catalysts For Selective Hydrogenation Of Hexa-1,5-diene

The addition of tin to palladium-alumina catalysts induces significant modifications of the catalytic properties of palladium in the hydrogenation of hexa-1,5-diene. The influence of the support, of the metal loading and of the preparation method on the chemical state of tin in Pd-Sn/Al2O3 catalysts are studied by Mössbauer spectroscopy. In reduced catalysts, about 60% of tin is present as Sn(0), which forms different Pd-Sn compounds, that are responsible for the changes in the catalytic performances.1121-41316Bacaud, R., Bussière, P., Figueras, F., (1981) J. Catal., 69, p. 399Fréty, R., Benaichouba, B., Bussière, P., Santos Cunha, D., Lam, Y.L., (1984) J. Mol. Catal., 25, p. 173Masai, M., Honda, K., Kubota, A., Ohnaka, S., Nishikawa, Y., Nakahara, K., Kishi, K., Ikeda, S., (1977) J. Catal., 50, p. 419Aduriz, H.R., Bodnariuk, P., Coq, B., Figueras, F., (1989) J. Catal., 119, p. 97Li, Y.-X., Klabunde, K.J., (1990) J. Catal., 126, p. 173Gray, P.R., Farha, F.E., (1976) Mössbauer Effect Methodology, 10, p. 47. , Ed. I. J. Gruverman and W. Seidel, Plenum Press, New YorkSnediker, D.K., (1966) Mössbauer Effect Methodology, 2, p. 161Cordey Hayes, M., Harris, I.R., (1967) Phys. Lett., 24 A, p. 80Elliott, R.P., (1986) Constitution of Binary Alloys, First Supplement, p. 732. , Mc Graw-Hill Book Company, New Yor