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首页> 外文期刊>RSC Advances >Novel protonated Fe-containing mesoporous silica nanoparticle catalyst: excellent performance cyclohexane oxidation
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Novel protonated Fe-containing mesoporous silica nanoparticle catalyst: excellent performance cyclohexane oxidation

机译：新型质子化的含铁中孔二氧化硅纳米粒子催化剂：环己烷氧化性能优异

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摘要

A mesoporous silica structure (MSN) was synthesized using the sol–gel method, followed by iron incorporation and protonation which afforded Fe-MSN and H/Fe-MSN with Si/Fe ratios of 20. Nitrogen physisorption confirmed their mesoporous structures with pore diameters of 3.9 nm. Iron incorporation decreased the degree of catalyst crystallinity. Fe-MSN and H/Fe-MSN catalyzed the oxidation of cyclohexane to cyclohexanone using hydrogen peroxide at 298 K in 1 h. The significant advantages of these catalysts were high conversion, short reaction time, easy work-up, and compatibility with various organic and aqueous solvents. The cyclohexanone product was obtained with excellent conversions of 86 and 97% at 298 K using Fe-MSN and H/Fe-MSN, respectively. H/Fe-MSN catalyst gave a higher conversion than Fe-MSN. A comparative study of cyclohexane oxidation in the presence of H2O2 over H/Fe-MSN heterogeneous catalyst showed that H/Fe-MSN had excellent activity at low temperature.
机译：使用溶胶-凝胶法合成了介孔二氧化硅结构（MSN），然后进行了铁结合和质子化作用，从而得到了Si / Fe比为20的Fe-MSN和H / Fe-MSN。氮的物理吸附证实了其介孔结构的孔径3.9 nm。铁的引入降低了催化剂的结晶度。 Fe-MSN和H / Fe-MSN在1小时内使用过氧化氢在298 K下催化环己烷氧化为环己酮。这些催化剂的显着优点是高转化率，较短的反应时间，易于后处理以及与各种有机和水性溶剂的相容性。使用Fe-MSN和H / Fe-MSN分别在298 K下获得了86％和97％的优异转化率的环己酮产物。 H / Fe-MSN催化剂的转化率高于Fe-MSN。 H / Fe-MSN非均相催化剂上H 2 O 2 存在下环己烷氧化的比较研究表明H / Fe-MSN在低温下具有优异的活性。

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