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以(C2H5O)4Si和Ti(OC4H9)4为硅源和钛源,采用溶胶-凝胶法制备SiO2-TiO2柱化剂,将原土直接加入柱化剂进行柱化反应得到SiO2-TiO2柱撑蒙脱土,对其进行结构和性能表征,考察了柱化剂中Si/Ti比、柱化剂/原土比、柱化反应条件(反应温度和超声处理)及热处理温度对其结构和性能的影响.结果表明,SiO2-TiO2柱体成功进入蒙脱土层间,在除去未参与柱化反应的柱化剂的条件下,比表面积可达127.2m2/g,热稳定性提高了70℃,柱化剂中Si含量增加有利于热稳定性的提高,500℃以下焙烧的SiO2-TiO2柱体中Ti以钛氧四面体和八面体形式存在,600℃焙烧可形成锐钛矿晶型.
SiO 2 -TiO 2 column was prepared by sol-gel method using (C2H5O) 4Si and Ti (OC4H9) 4 as the source of Si and Ti, Montmorillonite and its structure and properties were characterized. The effects of Si / Ti ratio, pillaring agent / original soil ratio, column reaction conditions (reaction temperature and ultrasonic treatment) and heat treatment temperature on the structure and properties The results showed that the SiO2-TiO2 column successfully entered the interlayer of montmorillonite, with the specific surface area of 127.2m2 / g and the thermal stability of 70 ℃ increased under the condition of removing the pillaring agent not involved in the column reaction , And the increase of Si content in the columnar agent is conducive to the improvement of thermal stability. In the SiO2-TiO2 column calcined at 500 ℃, Ti is present in the form of titanium tetrahedron and octahedron, and calcined at 600 ℃ to form anatase crystal.