文献类型：期刊文献

中文题名：Ti-Si介孔分子筛的转晶与控制

英文题名：The Mechanism of Mesoporous Phase Transition of Titanic-Silica Mesoporous Materials

作者：胡军[1];汪建军[1];周丽绘[1];谢颂海[2];刘洪来[1]

机构：[1]华东理工大学化学系,先进材料与制备教育部重点实验室,上海200237;[2]复旦大学化学系,上海市分子催化和功能材料重点实验室,上海200433

年份：2006

卷号：22

期号：6

起止页码：679

中文期刊名：物理化学学报

外文期刊名：Acta Physico-Chimica Sinica

收录：CSTPCD;;Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000238502100007)】；北大核心:【北大核心2004】；CSCD:【CSCD2011_2012】；PubMed;

基金：国家自然科学基金(20236010);上海市科委重大基础研究项目(05DJ14002);上海市分子催化和功能材料重点实验室开放资助项目(2005KF01)资助

语种：中文

中文关键词：Ti-Si分子筛;介孔结构;转晶;共溶剂

外文关键词：Ti-Si mesoporous materials, Mesoporous structure, Phase transition, Cosolvent

摘要：以季铵盐型阳离子Gemini表面活性剂[C16H33(CH3)2N+(CH2)6N+(CH3)2C16H33]·2Br-(GEM16-6-16)为模板剂,改变n(Ti)/n(Si)比值,合成了系列Ti-Si介孔分子筛.X射线衍射(XRD)和透射电子显微镜(TEM)等表征结果表明,在n(Ti)/n(Si)≤0.20时,分子筛为高度有序六方介孔;当n(Ti)/n(Si)为0.30时,介孔转晶为立方相;当n(Ti)/n(Si)为0.50时,介孔转晶为层状相;n(Ti)/n(Si)为1.0时,材料失去有序孔道结构.FT-IR分析表明,在分子筛骨架间形成了Ti—O—Si键,而且Ti—O—Si键的数目随n(Ti)/n(Si)的增加而增加,达到一定饱和值后基本保持不变.乙醇和丁醇对纯硅基介孔分子筛孔结构转晶控制作用呈现六方相#立方相$层状相递变规律,因而钛酸正丁酯水解生成的丁醇对Ti-Si介孔分子筛转晶具有一定的控制作用.
A series of titanic-silica mesoporous materials have been synthesized by using the Gemini surfactant [C16H33（CH3）2N^＋（CH2）6N^＋（CH3）2C16H33]·2Br^-（GEM16-6-16） as a template. The XRD patterns and TEM images provide the evidence that the mesoporous phases are changed according to the following path by varying the molar ratio of n（Ti）/ n（Si）： hexagonal mesoporous structures are obtained when n（Ti）/n（Si）≤0.20; cubic when n（Ti）/n（Si）=0.30; lamellar when n（Ti）/n（Si）=0.50; and amorphous when n（Ti）/n（Si）=1.0. The FT-IR spectra suggest that the amount of Ti-O-Si bonds in the framework increases with increasing n（Ti）/n（Si） initially, and reaches to a limit when n（Ti）/n（Si）≥0.20. Additionally, the ethanol and butanol have been approved that they can control the evolvement of silica mesoporous phase transition. Following that, the process of titanic-silica mesoporous phase transition has been elucidated by the aggregation of Ti-O-Si bonds and the effect of butanol produced from the hydrolysis of tetrabutyl fitanate（TBOT）.