关键词: 有序介孔材料, 杂多酸盐, 希夫碱, 选择性氧化, 苯甲醛

Abstract:

A series of ordered mesoporous silica hybrid materials(SiNiW11SchiffSBA15)were prepared by using successive grafting procedures of SBA15 silica with 3aminopropyltrimethoxysilane, benzaldehyde, and transition metalmonosubstituted Keggintype polyoxometalates(SiNiW11).The hybrid materials were characterized to confirm the structure integrity of the Keggin unit and Schiff base ligand after the incorporation and to investigate the morphology and surface textural properties of the composite catalysts.These materials were subsequently utilized as efficient and selective catalysts in the reaction of oxidation of styrene to benzaldehyde using H2O2 as an oxidant.The conversion of styrene and the selectivity to benzaldehyde were 56.8% and 97.0%, under the condition of acetonitrile media, 100 mg catalyst, 1∶1 H2O2 to styrene molar ratio, and reaction at 60℃ for 12 h.Finally, the reusability of the catalysts was evaluated.

Key words: 有序介孔材料, 杂多酸盐, 希夫碱, 选择性氧化, 苯甲醛