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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Synthesis and characterization of mesoporous, tungsten-containing molecular sieve composites
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Synthesis and characterization of mesoporous, tungsten-containing molecular sieve composites

机译：介孔含钨分子筛复合材料的合成与表征

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摘要

Mesoporous, tungsten-containing molecular sieve (W-SBA-15) composites were successfully synthesized via one-step hydrothermal processing using tetraethyl orthosilicate (TEOS) as the silica precursor, sodium tungstate as the tungsten precursor, and pluronic P123 triblock polymer (EO20PO70EO20, M-av = 5800) as a structure-directing reagent. The influence of various synthesis factors, such as TEOS/sodium tungstate (Si/W) molar ratios, stirring solution temperatures, TEOS pre-hydrolysis time, and crystallization temperatures, on the structure of the W-SBA-15 composite were investigated. The prepared materials were characterized by using X-ray diffraction (XRD), infrared spectroscopy (IR), diffuse reflectance ultraviolet-visible spectroscopy (DR UV-vis), scanning electron microscopy (SEM), and nitrogen adsorption-desorption measurements. The results showed that all the W-SBA-15 composite materials retained the mesopore structure of SBA-15 and the tungsten oxide species successfully substituted silica in the framework. (C) 2009 Elsevier B.V. All rights reserved.
机译：通过使用原硅酸四乙酯（TEOS）作为二氧化硅前驱体，钨酸钠作为钨前驱体和普朗尼克P123三嵌段聚合物（EO20PO70EO20，）通过一步水热处理成功合成了介孔含钨分子筛（W-SBA-15）复合材料。 M-av = 5800）作为结构导向试剂。研究了各种合成因素，例如TEOS /钨酸钠（Si / W）的摩尔比，搅拌溶液温度，TEOS预水解时间和结晶温度对W-SBA-15复合材料结构的影响。通过使用X射线衍射（XRD），红外光谱（IR），漫反射紫外可见光谱（DR UV-vis），扫描电子显微镜（SEM）和氮吸附-脱附测量来表征所制备的材料。结果表明，所有W-SBA-15复合材料均保留了SBA-15的中孔结构，氧化钨物种成功取代了骨架中的二氧化硅。 （C）2009 Elsevier B.V.保留所有权利。

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