Incorporation of tungsten oxide in mesoporous silica: Catalytic epoxidation of olefins using sodium-bi-carbonate as co-catalyst

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• 作者：Rajesh Bera ; Subratanath Koner ; ^{snkoner@chemistry.jdvu.ac.in} ; ^{skoner55@hotmail.com}
• 关键词：Tungsten oxide ; Mesoporous silica ; Epoxidation ; Olefin ; Heterogeneous catalysis
• 刊名：Inorganica Chimica Acta
• 出版年：2012
• 期刊代码：40_00201693
• 类别：ch
• 出版时间：1 April, 2012
• 卷：384
• 期：Complete
• 页码：233-238
• 文件大小：526 K

摘要

Tungsten oxide incorporated mesoporous molecular sieve (WOb>3b>-SBA-15) composite was successfully synthesized via one-step hydrothermal process using tetraethylorthosilicate (TEOS) as the silica source, sodium tungstate as the tungsten precursor, and pluronic P123 triblock polymer (EOb>20b>POb>70b>EOb>20b>, Mb>avb> = 5800) as a structure-directing agent. The material was characterized by small angle X-ray diffraction (SAX), transmission electron microscopy (TEM), nitrogen sorption measurement and Fourier transform infrared spectroscopy. The catalyst showed excellent catalytic efficiency in epoxidation reactions with various olefinic compounds using Hb>2b>Ob>2b> as oxidant and NaHCOb>3b> as co-catalyst. The solid catalyst can be recovered after reaction and can be reused for several times in catalytic reactions without any significant loss of activity.