文献类型：期刊文献

英文题名：Direct synthesis of Cerium(III)-incorporated SBA-15 mesoporous molecular sieves by two-step synthesis method

作者：Dai, Qiguang[1]; Wang, Xingyi[1]; Chen, Guoping[1]; Zheng, Yi[1]; Lu, Guanzhong[1]

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

年份：2007

卷号：100

期号：1-3

起止页码：268

外文期刊名：MICROPOROUS AND MESOPOROUS MATERIALS

收录：;EI(收录号：20070610417040);WOS:【SCI-EXPANDED(收录号:WOS:000244798300034)】；

语种：英文

外文关键词：SBA-15; cerium; acid media; two-step synthesis method; pore size

摘要：Cerium(III)-incorporated SBA-15 (Cc-SBA-15) mesoporous molecular sieves were successfully synthesized by a two-step direct synthesis method in acid media, and characterized by XRD, UV-vis, ESR, TEM, N-2 adsorption and FT-IR. The Ce-SBA-15 samples prepared show highly ordered mesostructures with larger pore diameter, pore volume and uniform mesopore size distribution. The valence of cerium species incorporated into the frameworks of SBA-15 can be controlled by adjusting the pH value of the synthesis solution accurately. When the pH value of the solution is <= 6.0, Ce(III)-SBA-15 can be synthesized. If the pH value is higher than 6.0, the cerium species exist in the SBA-15 sample in form of Ce(IV). Moreover, it can be found that the two-step synthesis method is a feasible, effective and simple method to expand the pore size and the pore volume of SBA-15. (c) 2006 Elsevier Inc. All rights reserved.