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Ce-MCM-48立方介孔分子筛结构的光谱表征
引用本文:金忠秀,雍国平,盛良全,童红武,苏庆德,刘少民.Ce-MCM-48立方介孔分子筛结构的光谱表征[J].光谱学与光谱分析,2006,26(3):484-487.
作者姓名:金忠秀  雍国平  盛良全  童红武  苏庆德  刘少民
作者单位:中国科学技术大学化学与材料科学学院,安徽,合肥,230026
摘    要:在碱性条件下,以混合模板剂pH调节水热合成了掺入铈的介孔分子筛Ce-MCM-48,并采用XRD,DRUV-Vis(紫外-可见漫反射),FTIR,XRF结合BET等测试手段对样品进行表征.实验结果表明,采用本方法所合成的掺铈介孔材料仍保持立方介孔的有序结构,同时适量的铈的掺入和pH调节使分子筛的有序性及吸附性能得到改善,晶胞参数增大,孔径更均一,孔壁增厚.从而可推出Ce-MCM-48的热稳定性、水热稳定性、催化活性及择形选择性可得到提高.掺入的铈以四配位状态高度分散在介孔的有序结构当中.红外光谱表明不同量的铈的掺入对骨架硅的各种振动扰动程度不同.

关 键 词:Ce  MCM-48  光谱表征  立方介孔分子筛
文章编号:1000-0593(2006)03-0484-04
收稿时间:2004-12-28
修稿时间:2005-05-08

Spectroscopic Characterization of Structure of Cerium Incorporated MCM-48 Mesoporous Molecular Sieve
JIN Zhong-xiu,YONG Guo-ping,SHENG Liang-quan,TONG Hong-wu,SU Qing-de,LIU Shao-min.Spectroscopic Characterization of Structure of Cerium Incorporated MCM-48 Mesoporous Molecular Sieve[J].Spectroscopy and Spectral Analysis,2006,26(3):484-487.
Authors:JIN Zhong-xiu  YONG Guo-ping  SHENG Liang-quan  TONG Hong-wu  SU Qing-de  LIU Shao-min
Institution:School of Chemistry and Material Science, University of Science and Technology of China, Hefei 230026, China
Abstract:Cerium incorporated MCM-48 molecular sieves have been hydrothermally synthesized using a mixed template and pH adjusting route The samples were characterized by various physicochemical methods, including X-ray diffraction, diffuse reflectance UV-Vis spectroscopy, FTIR spectroscopy, XRF spectroscopy, and nitrogen adsorption. These results reveal that cerium is incorporated in MCM-48 and it is in the form of well-dispersed tetra-coodinated cerium ion. The proper concentration of cerium and adjusting pH can keep Ce-MCM-48 with higher specific surface area , larger unit-cell parameter, narrower pore-size distribution, and thicker pore wall than those of MCM-48. These deduce higher activity, and better selectivity, thermal stability and hydrothermal stability than those of MCM-48. The concentration of Ce incorporated in MCM-48 affects the vibration of the framewoke Si of molecular sieves.
Keywords:Cerium  MCM-48  Spectroscopic characterization  Cubic molecular sieve
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