“CATALIZADORES DE Ti-MCM-41 PREPARADOS VIA POST-SÍNTESIS. UTILIZACIÓN EN LA EPOXIDACIÓN DE LIMONENO CON H2O2.”

D. MARINO, N. G. GALLEGOS, J. F. BENGOA, A. M. ALVAREZ, M. V. CAGNOLI, S. G. CASUSCELLI, E. HERRERO Y S. G. MARCHETTI

Gramado, Rio Grande do Sul, Brasil

Simposio; “XX Simposio Iberoamericano de Catálisis”; 2006

Ti-MCM-41 catalysts were prepared incorporating Ti by post-synthesis methods: incipient wetness and wet impregnation of MCM-41 mesoporous solid. The samples were characterized by XRD at low angle, UV-Visible DRS, BET and colorimetric method. The results were compared with that obtained for Ti-MCM-41 hydrotermically prepared. All catalysts  were tested in the limonene epoxidation with H2O2 reaction. Three kinds of Ti sites were observed in post-synthesis catalysts which were different from that found in the hydrothermal Ti-MCM-41. These structural differences do not produce important changes in the catalytic activity, instead a slight decrease in the epoxide selectivity can be observed. The catalysts prepared by post-synthesis methods are promising in the limonene epoxidation with H2O2 since these methods are simple and reproducible.