立方介孔相含钕氧化硅的合成与表征  

Synthesis and Characterization of Cubic Mesoporous Neodymium-containing Silica

作　　者：姜文清[1] 刘玲[1] 张喜燕[1] 吴迪[1] 戴乐蓉[2] 杨喜昆 王彤文[1] 

机构地区：[1]云南师范大学化学化工学院,昆明650092 [2]北京大学化学与分子工程学院,北京100871 [3]云南省分析测试研究所,昆明650051

出　　处：《无机化学学报》2004年第12期1407-1412,共6页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金资助项目(No.20163002);云南省自然科学基金重点项目(No.2003E0005Z)

摘　　要：以十六烷基三甲基溴化铵为结构导向剂,通过水热法合成了具有立方结构的含钕Nd鄄MCM鄄48介孔分子筛材料。XRD和TEM测试表明当nNd/nSi<0.05时可以获得典型的长程有序介孔立方结构相,随nNd/nSi比的增加,晶胞参数的增大和红外吸收光谱(FT鄄IR)的变化为Nd进入介孔分子筛骨架中提供了有力证据。N2吸附鄄脱附实验给出了其BET表面积为1195m2·g-1,BJH平均孔径为3.6nm。紫外鄄可见漫反射光谱(UV鄄Vis)证明钕氧形成一种八面体结构。X射线光电子能谱(XPS)进一步证明钕主要以三价形式存在于立方介孔分子筛骨架中。The cubic neodymium-modified MCM-48 molecular sieves were synthesized via a hydrothermal method using cethyltrimethylammonium bromide as template. The X-ray diffraction and TEM indicate a well-ordered cubic mesoporous structure was obtained 'when the Nd/Si molar ration was less than 0.05. With the increase of Nd/Si molar ration, the increase of unit cell parameters and the change of FT-IR provide powerful evidences for the incorporation of neodymium in the framework of mesoporous molecular sieves. Nitrogen adsorption-desorption suggests the BET surface area is 1195 m(2).g(-1) and that the average pore diameter is 3.6 nm. Diffuse reflectance UV-Visible (UV-Vis) spectroscopy confirms the presence of neodymium in the octahedral position. X-ray photoelectron spectroscopy (XPS) studies further reveal that most of neodymium is trivalent in the framework of mesoporous molecular sieves.

关 键 词：立方介孔相 含钕氧化硅 合成 水热法 介孔分子筛 十六烷基三甲基溴化铵 

分 类 号：TQ426.81[化学工程] O643.36[理学—物理化学]