文献类型：期刊文献

中文题名：Synthesis of cerium-doped MCM-48 molecular sieves and its catalytic performance for selective oxidation of cyclohexane

英文题名：Synthesis of cerium-doped MCM-48 molecular sieves and its catalytic performance for selective oxidation of cyclohexane

作者：Zhan Wangcheng[1];Lu Guanzhong[1];Guo Yanglong[1];Guo Yun[1];Wang Yanqin[1];Wang Yunsong[1];Zhang Zhigang[1];Liu Xiaohui[1]

机构：[1]E China Univ Sci & Technol, Res Inst Ind Catalysis, Adv Mat Lab, Shanghai 200237, Peoples R China

年份：2008

卷号：26

期号：4

起止页码：515

中文期刊名：Journal of Rare Earths

外文期刊名：JOURNAL OF RARE EARTHS

收录：CSTPCD;;EI(收录号：20083711533737);Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000259591900011)】；CSCD:【CSCD2011_2012】；

基金：Project supported by the National Basic Research Program of China (2004CB719500), the Commission of Science and Technology of Shanghai Municipality (06DJ14006) and Shanghai Municipal Education Commission (2008CG35)

语种：英文

中文关键词：Ce-doped MCM-48; synthesis; cyclohexane; catalytic oxidation; rare earths

外文关键词：Ce-doped MCM-48; synthesis; cyclohexane; catalytic oxidation; rare earths

摘要：Cerium-doped MCM-48 molecular sieves were synthesized hydrothermally and characterized by X-ray diffraction, nitrogen adsorption, transmission electron microscope, FT-IR spectroscopy, UV-visible spectroscopy, and Raman spectroscopy. The results showed that all the samples held the structure of MCM-48, and Ce could enter the framework of MCM-48. However, when Ce/Si molar ratio in the sampies was high （0.04 or 0.059）, there were CeO2 crystallites as secondary phase in the extraframework of MCM-48. Ce-doped MCM-48 was a very efficient catalyst for the oxidation of cyclohexane in a solvent-free system with oxygen as an oxidant. In the conditions of 0.5 MPa 02 and 413 K for 5 h, the conversion of cyclohexane was 8.1% over Ce-MCM-48-0.02, the total selectivity of cyclohexanol and cyclohaxnone was 98.7%. With an increase of Ce content, the conversion of cyclohexane and the selectivity to cyclohexanol decreased somewhat, but the selectivity to cyclohexanone increased.
Cerium-doped MCM-48 molecular sieves were synthesized hydrothermally and characterized by X-ray diffraction, nitrogen adsorption, transmission electron microscope, FT-IR spectroscopy, UV-visible spectroscopy, and Raman spectroscopy. The results showed that all the samples held the structure of MCM-48, and Ce could enter the framework of MCM-48. However, when Ce/Si molar ratio in the samples was high (0.04 or 0.059), there were CeO2 crystallites as secondary phase in the extraframework of MCM-48. Ce-doped MCM-48 was a very efficient catalyst for the oxidation of cyclohexane in a solvent-free system with oxygen as an oxidant. In the conditions of 0.5 MPa O-2 and 413 K for 5 h, the conversion of cyclohexane was 8.1% over Ce-MCM-48-0.02, the total selectivity of cyclohexanol and cyclohaxnone was 98.7%. With an increase of Ce content, the conversion of cyclohexane and the selectivity to cyclohexanol decreased somewhat, but the selectivity to cyclohexanone increased.