Co(III)-containing mesoporous silica as an efficient catalyst in selective dihydroxylation of cyclohexene
Co(III)-containing mesoporous silica as an efficient catalyst in selective dihydroxylation of cyclohexene
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DOI：
10.1016/j.molcata.2004.08.014
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发表时间：
2004-11
影响因子：
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通讯作者：
S. Samanta;S. Laha;N. Mal;A. Bhaumik
中科院分区：
文献类型：
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作者：
S. Samanta;S. Laha;N. Mal;A. Bhaumik
以阳离子表面活性剂十六烷基三甲基溴化铵自组装分子阵列为模板，在弱酸性条件下，采用水热法合成了不同钴含量(Si/Co摩尔比为5~30)的含钴介孔二氧化硅。用粉末X射线衍射仪、氮气吸附、透射电子显微镜、扫描电子显微镜/能谱、紫外-可见和傅立叶变换红外光谱等手段对材料进行了表征。表征数据表明，Co(III)物种被牢固地固定在二维六方介孔二氧化硅骨架中。这些含Co(III)的介孔材料在温和的液相反应条件下，以过氧化氢、叔丁基氢过氧化氢(TBHP)或分子氧为氧化剂，以乙腈为溶剂，在环己烯的液相二羟基化反应中表现出良好的催化活性和高的反式选择性。
Cobalt-containing mesoporous silica have been synthesized hydrothermally using different Co content (Si/Co mole ratios 5–30) in the synthesis gel using the self-assembled molecular array of cationic surfactant cetyltrimethylammonium bromide as a supramolecular template under very mild acidic conditions. Powder XRD, N2adsorption, TEM, SEM/EDS, UV–visible and FT-IR tools have been employed to characterize these materials. Characterization data suggested that the Co(III) species have been anchored strongly in the 2D-hexagonal mesoporous silica framework. These Co(III)-containing mesoporous materials showed excellent catalytic activity and high trans-selectivity in the liquid phase dihydroxylation of cyclohexene under mild liquid phase reaction conditions using hydrogen peroxide, tert-butyl hydroperoxide (TBHP) or molecular O2, as oxidants and acetonitrile solvent.