高等学校化学学报Issue(6)：1042-1051,10.DOI:10.7503/cjcu20150035
四配位Ti掺杂有机杂化介孔分子筛的直接合成与表征
Synthesis and Characterization of Titanium-containing Periodic Mesoporous Organosilicas
摘要
Abstract
Titanium-containing periodic mesoporous organosilicas( Ti-PMO) were hydrothermally synthesized using triblock copolymer P123 as the template, 1,2-bis(trimethoxysilyl)ethane as the silica precursor and tit-anocene dichloride as the titanium precursor. The crystal and textural properties of Ti-PMO were characterized by X-ray diffraction( XRD) , transmission electron microscope( TEM) and N2 physisorption. The influence of different titanium precursors, prehydrolysis time of titanium precursor, acid concentration and molar ratio of Si/Ti on the form of titanium in PMO were investigated by means of diffuse reflectance UV-Vis spectroscopy. It was revealed that Ti atoms could be incorporated into the framework of PMO materials in the form of tetrahe-dral coordination by finely controlling the synthesis condition. The hydrolysis rate of titanium and silica precur-sors should be precisely balanced to bring the oligomer titanium species and oligomer silica species, which are the hydrolysis intermediates of titanium precursor and silica precursor, into intimate contact and then co-con-densate to form Ti—O—Si structure. Tetrahedral-coordinated Ti-containing PMO with good thermal and hydro-thermal stability can be successfully obtained using titanocene dichloride as the titanium precursor at the ratio of n(Si)/n(Ti)>20 and prehydrolyzed for 6 h at acid concentration of 0. 18 mol/L.关键词
有机杂化介孔分子筛/四配位Ti/掺杂/水解速率/水热合成Key words
Periodic mesoporous organosilica/Tetrahedrally-coordinated Ti/Doping/Hydrolysis rate/Hydro-thermal synthesis分类
化学化工引用本文复制引用
王东龙,周静红,隋志军,周兴贵,Scott L. Susannah..四配位Ti掺杂有机杂化介孔分子筛的直接合成与表征[J].高等学校化学学报,2015,(6):1042-1051,10.基金项目
国家自然科学基金(批准号:21106047)资助 （批准号:21106047）
