文献类型：期刊文献

英文题名：Effect of surface functionalization of cerium-doped MCM-48 on its catalytic performance for liquid-phase free-solvent oxidation of cyclohexane with molecular oxygen

作者：Fu, Yu;Zhan, Wangcheng[1];Guo, Yanglong;Wang, Yanqin;Liu, Xiaohui;Guo, Yun;Wang, Yunsong;Lu, Guanzhong

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

年份：2015

卷号：214

起止页码：101

外文期刊名：MICROPOROUS AND MESOPOROUS MATERIALS

收录：;EI(收录号：20152100879972);WOS:【SCI-EXPANDED(收录号:WOS:000356749900014)】；

基金：This project was supported financially by the National Basic Research Program of China (2010CB732300) and National Natural Science Foundation of China (21103048).

语种：英文

外文关键词：Ce-MCM-48 mesoporous materials; Surface hydrophobicity; Post-functionalization; Cyclohexane oxidation; Free-solvent catalytic reaction

摘要：Ce-doped MCM-48 (Ce-MCM-48) mesoporous molecular sieve was prepared hydrothermally and its surface was modified with organic groups or fluorine, and their physicochemical properties were characterized by XRD, low-temperature N-2 adsorption, TEM, UV-visible and FT-IR spectroscopies, XPS and contact angle measurement. The results indicated that Ce species were highly dispersed on the MCM-48 materials as Ce3+ and Ce4+. After post-functionalization of Ce-MCM-48, the organic groups or fluorine species have been immobilized on the surface of Ce-MCM-48, but the chemical status of Ce species were hardly changed, and the post-functionalization improved the surface hydrophobicity of the Ce-MCM-48 sample. The catalytic activity testing for the oxidation of cyclohexane with molecular oxygen showed that, Ce-MCM-48 after post-functionalization exhibited the higher cyclohexane conversion and selectivity to cyclohexanol and cyclohexanone, 8.9% cyclohexane conversion with 91.2% selectivity to cyclohexanone and cyclohexanol could be achieved over the Ce-MCM-48 with F-modified catalyst, which was attributed to the proper modification of their surface properties including hydrophobicity and polarity. The F-modified catalyst also showed excellent reusability, and its catalytic performance has no obvious deterioration after being repeatedly used five times. (C) 2015 Elsevier Inc. All rights reserved.