Effect of Titania and Alumina Addition to Mesoporous Silica

Abstract

Mesoporous silica was prepared by sol-gel method using Si(OC₂H₅)₄ in the presence of organic surfactant. Ti(OC₂H₅)₄ and Al(OC₂H₅)₃ were used as Ti and Al source. The average pore size was 2.5-3.2nm and the specific surface area was 1150-1300m²/g. The mesoporous structure was not changed by the addition of titania and alumina. The acidity of TiO₂-added mesoporous silica exhibited the maximum at a low TiO₂ content and was higher than that of Al₂O₃-added mesoporous silica. This is because the acid strength of TiO₂/SiO₂ system is higher than that of Al₂O₃/SiO₂ system.