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

• DOI: 10.1016/j.cattod.2007.12.111
• Publication Date: 2008-03-06T19:00:55Z
• Authors: Damián Marino; Norma G. Gallegos; José F. Bengoa; Ana M. Alvarez; María V. Cagnoli; Sandra G. Casuscelli; Eduardo R. Herrero; Sergio G. Marchetti
• Keywords: Incipient wetness impregnation; MCM-41; Hydrothermal Synthesis

Abstract 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 H 2 O 2 . 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 H 2 O 2 since these methods are simple and reproducible.