| Ce-MCM-48介孔分子筛的合成、表征和催化性能 |
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| 作者单位： | 中国科学技术大学化学与材料科学学院,合肥,230026;中国科学技术大学化学与材料科学学院,合肥,230026;中国科学技术大学化学与材料科学学院,合肥,230026;中国科学技术大学化学与材料科学学院,合肥,230026;中国科学技术大学化学与材料科学学院,合肥,230026;中国科学技术大学化学与材料科学学院,合肥,230026 |
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| 摘 要： |
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| 关 键 词： | 介孔分子筛 MCM-48 水热 pH调节 |
Synthesis, Characterization and Application of Ce-MCM-48 as a Mesoporous Molecular Sieve |
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| Authors: | Jin Zhongxiu Tong Hongwu Yong Guoping Sheng Liangquan Liu Qingliang Liu Shaomin |
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| Abstract: | Cerium incorporated MCM-48 molecular sieves have been hydrothermally synthesized by both a mixed template and a variable pH approach. The samples were characterized by various physicochemical methods, including X-ray diffraction, transmission electron microscopy, diffuse reflectance UV-vis spectroscopy, XRF spectroscopy, nitrogen adsorption. These results reveal that cerium is incorporated in MCM-48 in the form of well-dispersed tetra-coodinated cerium ion. Maintaining the proper concentration of cerium and adjusting the pH allows for a more ordered structure with a much higher specific surface area than that of MCM-48. Ce-MCM-48 was employed in the liquid phase oxidation of cyclohexane with aqueous H2O2. The results showed that Ce-MCM-48 is more active as a catalyst for the liquid phase oxidation of cyclohexane. The oxidation conversion catalyzed by Ce-MCM-48 is 8.3 %-14.2% higher than that catalyzed by MCM-48 and the selectivity for the main products increase by 63.4%-68.8%. Accordingly, Ce-MCM-48 has been shown to have important potential applications. |
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| Keywords: | Mesoporous molecular sieve MCM-48， hydrothermally pH adjustment |
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