敞开体系法合成W-MCM-41介孔催化剂及其性能

以十六烷基三甲基溴化铵为模板剂、正硅酸乙酯为硅源、钨酸钠为钨源，采用敞开体系法制备了W-MCM-41介孔催化剂样品。利用多种表征手段对其进行了表征，考察了投料中硅钨摩尔比对W-MCM-41结构和催化环己烯氧化性能的影响。研究发现，所制W-MCM-41介孔催化剂样品均保持着MCM-41的介孔结构，而且表现出较好的催化性能；随着硅钨摩尔比的减小，样品晶胞参数和晶面间距逐渐增大，而硅钨摩尔比为30时所制的W-MCM-41样品催化活性最高。

Preparation and Property of W-MCM-41 Mesoporous Catalysts in an Open System

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.