光谱学与光谱分析 |
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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* |
School of Chemistry and Material Science, University of Science and Technology of China, Hefei 230026, China |
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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.
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Received: 2004-12-28
Accepted: 2005-05-08
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Corresponding Authors:
LIU Shao-min
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Cite this article: |
JIN Zhong-xiu,YONG Guo-ping,SHENG Liang-quan, et al. Spectroscopic Characterization of Structure of Cerium Incorporated MCM-48 Mesoporous Molecular Sieve [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2006, 26(03): 484-487.
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URL: |
https://www.gpxygpfx.com/EN/Y2006/V26/I03/484 |
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