| 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 |
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| 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-MCM-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-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-脱附实验给出了其BET表面积为1 195 m2·g-1，BJH平均孔径为3.6 nm。紫外-可见漫反射光谱(UV-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。 |
| 关键词: 立方介孔相 含钕氧化硅 合成 表征 |
| 基金项目: |
| Abstract: 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 1 195 m2·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. |
| Keywords: cubic mesophase neodymium-containing silica synthesis characterization |
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| 姜文清,刘 玲,张喜燕,吴 迪,戴乐蓉,杨喜昆,王彤文.立方介孔相含钕氧化硅的合成与表征[J].无机化学学报,2004,20(12):1407-1412. |
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