Assembly of Mesoporous Silica Molecular Sieves Based on Nonionic Ethoxylated Sorbitan Esters as Structure Directors

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• 作者：Eric Prouzet ; Frederic Cot ; Georges Nabias ; André ; Larbot ; Patricia Kooyman ; and Thomas J. Pinnavaia
• 刊名：Chemistry of Materials
• 出版年：1999
• 出版时间：June 1999
• 年：1999
• 卷：11
• 期：6
• 页码：1498 - 1503
• 全文大小：215K
• 年卷期：v.11,no.6(June 1999)
• ISSN：1520-5002

文摘

A new family of mesoporous silica molecular sieves with micelle-templated structures(MTS) has been synthesized using nonionic ethoxylated sorbitan esters, namely, Tween-20,-40, -60, or -80, as structure-directing agents. These MTS materials possess a wormhole-like framework typical of MSU-X mesostructures, with intraparticle (framework) pore sizesin the 3.0-4.0 nm range. Unlike previously reported MSU-X silicas, these new derivativesform monodispersed small particles in the 30-60 nm range, depending on the nature of thesurfactant, and exhibit substantial interparticle (textural) porosity in the 9-20 nm range.The sorbitan surfactants are nontoxic, biodegradable, and biocompatible when solvent free,making them attractive structure directors for the synthesis of mesoporous materials. Thecombination of complementary framework and textural pore distributions should beadvantageous in the use of the mesostructures as heterogeneous catalysts, particularly forreactions that are normally diffusion limited.