SELF pH-CONTROLLED AL-INCORPORATION FOR MESOPOROUS ALUMINOSILICATE AS LEWIS ACID CATALYST

摘要

The self pH-controlled synthesis of mesoporous alumino silicate using F127 triblock copolymer enabled the formation of aluminum incorporated mesoporous silica having wormhole-like pore system by using sodium metasilicate as a silica source which allowed the synthesis starting from basic condition. Higher pH value comparing with conventional synthesis method made it possible to incorporate aluminum into the silica framework with cubic mesostructure. In spite of the addition of aluminum during the synthesis of SBA-16, cubic mesoporosity of the catalysts were maintained and aluminum sites dominantly exhibited Lewis acidity which could be applied to Friedel-Crafts alkylation. Therefore, this self pH-controlled synthesis could offer mesoporous aluminosilicates of wide range of Si/Al ratios (200-20) having cubic structure by using cheap silica source and outstandingly perfect Lewis acid sites.