Ti-MCM-41 catalysts prepared by post-synthesis methods

D MARINO; N GALLEGOS; J BENGOA; A ALVAREZ; M CAGNOLI; S CASUSCELLI; E HERRERO; G MARCHETTI

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Elsevier Science B.V., Netherlands. Editors: Prof. H.H. Kung, Evanston, USA. Prof. K. Segawa, Tokyo, Japan. Prof. J.C. Vedrine, Liverpool, UK.

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.