Ti-MCM-41 catalysts prepared by post-synthesis methods Limonene epoxidation with H2O2

DAMIÁN MARINO, NORMA G. GALLEGOS, JOSÉ F. BENGOA, ANA M. ALVAREZ, MARÍA V. CAGNOLI, SANDRA G. CASUSCELLI, EDUARDO R. HERRERO AND SERGIO G. MARCHETTI,

CATALYSIS TODAY

Año: 2008 vol. 133 p. 632 - 638

0920-5861

Ti-MCM-41 catalysts were prepared incorporating Ti by post-synthesis methods: wetness and wet impregnation of MCM-41 mesoporous solid. The samples were characterized by XRD at low angle, UV–vis DRS, Raman spectroscopy, BET, ICP and colorimetry. The results were compared with those obtained for Ti-MCM-41 hydrotermically prepared. All catalysts were tested in the limonene epoxidation with H2O2. 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.