La骨架负载中孔分子筛的合成与表征  

Synthesis and Characterization of La-MCM-41 Mesoporous Molecular Sieves with La Skeleton Adulteration

作　　者：葛学贵[1] 马广伟[2] 黄少云[3] 许中强[2] 

机构地区：[1]中国地质大学材料科学与化学工程学院,湖北武汉430074 [2]中国石化上海石油化工研究院,上海201208 [3]武汉化工学院制药系,湖北武汉430073

出　　处：《稀土》2004年第6期1-4,共4页Chinese Rare Earths

基　　金：国家自然科学基金项目资助(40172018)

摘　　要：通过水热晶化法成功合成了骨架负载镧的中孔分子筛La-MCM-41,并用XRD、IR、Raman图谱进行表征,XRD图谱表明合成样品为中孔分子筛,IR、Raman图谱表明镧进入了分子筛骨架。同时考察了温度和硅源对分子筛合成的影响,以硅酸钠为硅源时,100℃为最佳合成温度,以正硅酸乙酯为硅源时,最佳合成温度为120℃;在相同温度下,以硅酸钠为硅源有利于形成中孔物相,且结晶度较好,以正硅酸乙酯为硅源,结晶度较低,不易形成中孔物相。CTMAB-templated mesoporous molecular sieves with La skeleton adulteration were synthesized under hydrothermal conditions. The as-synthesized molecular sieves have small angle regions diffraction peaks in their XRD patterns corresponding to the mesoporous structures. And their IR spectra and Raman spectra show that the as-synthesized samples have characteristic bands of mesoporous MCM-41 molecular sieves, at the same time their IR spectra and Raman spectra of pure mesoporous molecular sieves are obviously different from those of La skeleton- adulterationed La-MCM-41 mesoporous molecular sieves. The effects of temperatures and silicon sources on La-MCM-41 were explored. The results indicate that when Na_2SiO_3 is used as silicon source, the best temperature is 100℃,while TEOS 120℃.At the same temperature, Na_2SiO_3, used as the silicon source, is helpful for forming mesoporous substance and the crystallites are better, but when using TEOS, it is difficult to yield mesoporous substance and the crystallites are low.

关 键 词：骨架负载 La-MCM-41 水热晶化合成 

分 类 号：O643.36[理学—物理化学]