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Synthesis, Characterization and Application of Ce-MCM-48 as a Mesoporous Molecular Sieve
Jin Zhongxiu,Tong Hongwu,Yong Guoping,Sheng Liangquan,Liu Qingliang,Liu Shaomin*
Author NameAffiliationE-mail
Jin Zhongxiu School of Chemistry & Material Science, University of Science & Technology of China, Hefei 230026  
Tong Hongwu School of Chemistry & Material Science, University of Science & Technology of China, Hefei 230026  
Yong Guoping School of Chemistry & Material Science, University of Science & Technology of China, Hefei 230026  
Sheng Liangquan School of Chemistry & Material Science, University of Science & Technology of China, Hefei 230026  
Liu Qingliang School of Chemistry & Material Science, University of Science & Technology of China, Hefei 230026  
Liu Shaomin* School of Chemistry & Material Science, University of Science & Technology of China, Hefei 230026 liusm@ustc.edu.cn  
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.
Key words:  Mesoporous molecular sieve, MCM-48, hydrothermally, pH adjustment
FundProject:
Ce-MCM-48介孔分子筛的合成、表征和催化性能
金忠秀,童红武,雍国平,盛良全,刘清亮,刘少民*
摘要:
尝试以混合模板剂pH调节水热合成掺入铈的介孔分子筛Ce-MCM-48,并采用X射线衍射、高分辨透射电镜、紫外可见漫反射、 X射线荧光光谱、氮气吸附脱附测试手段对样品进行表征.结果表明,新合成的掺铈介孔材料仍保持立方介孔的有序结构,有序性及吸附性能得到改善.所合成的掺铈的立方介孔分子筛对环己烷的液相氧化反应的催化活性和选择性较高.Ce-MCM-48催化环己烷氧化反应的转化率较MCM-48催化的转化率提高了8.3%~14.2%,对主要产物的选择性提高了63.4%~68.8%.
关键词:  介孔分子筛  MCM-48  水热  pH调节
DOI:10.1088/1674-0068/18/6/1057-1061
分类号: