文献类型：期刊文献

英文题名：Synthesis of wormhole mesoporous silica by compressed carbon dioxide and application in catalytic hydrogenation

作者：Guo, Li[1];Zhang, Ran[1];Zhao, Xiuge[1];Gan, Huimei[1];Song, Baoning[1];Chen, Jizhong[1];Zhu, Wenwen[1];Hua, Li[1];Hou, Zhenshan[1]

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

年份：2014

卷号：21

期号：5

起止页码：739

外文期刊名：JOURNAL OF POROUS MATERIALS

收录：;EI(收录号：20143600025994);WOS:【SCI-EXPANDED(收录号:WOS:000341840900025)】；

基金：The authors are grateful for the support from the National Natural Science Foundation of China (No. 21373082, U1179302), the Research Fund for the Doctoral Program of Higher Education of China (20100074110014), and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Mesoporous silica; Carbon dioxide; Self-assembly; Hydrogenation

摘要：Mesoporous silica materials were prepared by infusion and selective condensation of silicon alkoxides within self-assembly formed from protonated hexadecylamine by CO2 in aqueous media. Compared to the conventional synthesis approach, the introduction of CO2 facilitates the hydrolysis of silicon alkoxide precursor and does not need adding any co-solvent in the course of the synthesis of mesoporous material. Moreover, CO2 can be used as a swelling agent increasing the average pore size form 3.2-5.4 nm with expansion rate of approximately 69 %. The influence of CO2 pressure and temperature were carefully investigated. During the preparation, nonionic surfactant hexadecylamine can turn into cationic surfactant in situ as mesostructure-directing template under pressurized CO2 condition, which is the key factor for the formation of ordered mesoporous silica. In addition, the supported Pd catalysts were prepared and characterized thoroughly by X-ray diffraction, H-1 NMR, C-13 NMR, ICP-AES analysis, scanning electron microscopy, transmission electron microscopy and nitrogen adsorption measurements. On the basis of the characterization and hydrogenation performance of the catalysts, the roles of different supports were discussed.