层间组装SiO2-TiO2粘土材料的制备与表征  

Preparation and Characterization of Interlayer Assembled SiO_2-TiO_2 Clay Material

作　　者：张颖[1,2] 陈爱平[1] 罗美芳[1] 李春忠[1] 许振良[2] 

机构地区：[1]华东理工大学材料科学与工程学院超细材料制备与应用教育部重点实验室,上海200237 [2]华东理工大学化工学院化学工程研究所,上海200237

出　　处：《过程工程学报》2010年第2期367-372,共6页The Chinese Journal of Process Engineering

基　　金：国家重点基础研究发展规划(973)基金资助项目(编号:2004CB719501);中国石油天然气股份有限公司科技风险创新研究基金资助项目(编号:050511-3-2)

摘　　要：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.SiO2-TiO2 pillaring agent was synthesized by sol-gel method,and raw clay was added into pillaring agent sol to prepare SiO2-TiO2 pillared montmorillonite.The structural properties of samples were characterized by XRD,N2 adsorption/desorption,TG-DTA and UV-Vis spectrometry techniques.The effects of material ratio and preparation conditions on the structural properties of the final products were investigated.From XRD patterns,the SiO2-TiO2 particles were intercalated into interlayer space of raw clay successfully.When nearly all the SiO2-TiO2 sol not pillared into the clay was removed,the BET specific surface area was up to 127.2 m2/g.Thermal stability of the pillared montmorillonite was increased by about 70 ℃ compared with the raw clay.And the sample with higher content of Si in SiO2-TiO2 particles showed higher thermal stability.Ti was in tetrahedral coordination and octahedral coordination in the pillared montmorillonite calcined below 500 ℃,and TiO2 was crystallized into anatase at 600 ℃.Compared with conventional wet method,the new dry method was simpler and more controllable in pillaring reaction process.And the SiO2-TiO2 pillared montmorillonite with regular structure was more easily obtained by the dry method.

关 键 词：柱撑蒙脱土 SIO2 TIO2 层间组装 

分 类 号：TQ050.421[化学工程]