Development of basicity in mesoporous silicas and metallosilicates

摘要: We report herein an experimental study on the development of basicity mesoporous silicas and metallosilicates (Nb- Ce-) SBA-15 MCF porous structures. Our results demonstrated that role catalyst structure (hexagonally ordered vs. cellular foam MCF), effect amount nature metal in supports (different acidic/redox properties), type nitrogen-containing organic modifier (imidazole, triazole aminotriazole) play important activity selectivity Knoevenagel condensation, which is a well-known probe reaction to determine inorganic solids. demonstrate niobium Lewis acidity determinant for condensation and, also, redox properties cerium basicity. In fact, acid–base cooperation plays positive promoting via ion-pair mechanism. These are interesting catalysts production fine chemicals due their thermal stability controllable catalytic properties.