Abstract:

W-MCM-41 mesoporous catalysts were successfully synthesized in an open system with tetraethyl orthosilicate(TEOS) as silica precursor, sodium tungstate as tungsten precursor, and cetyltrimethylammonium bromide(CTAB) as structuredirecting reagent. The samples were characterized by means of various techniques and their catalytic properties for the oxidation of cyclohexene were studied. The effects of Si/W molar ratios on the structure and catalytic properties were investigated in details. The results show that the prepared samples retained the ordered mesoporous structure of MCM-41 and exhibited high catalytic properties. The sample synthesized with n(Si)/n(W)=30 exhibited better catalytic property than others.

Key words: open synthesis system, W-MCM-41, Si/W molar ratio, structure characterization, cyclohexene oxidation