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首页> 外文期刊>Advanced Functional Materials >Rhodium Nanoparticle Encapsulated in a Porous Carbon Shell as an Active Heterogeneous Catalyst for Aromatic Hydrogenation
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Rhodium Nanoparticle Encapsulated in a Porous Carbon Shell as an Active Heterogeneous Catalyst for Aromatic Hydrogenation

机译：铑纳米颗粒包裹在多孔碳壳中作为芳香族加氢活性多相催化剂

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摘要

Rhodium (Rh) nanoparticle (core)-carbon (shell) powder was prepared by double-layer coating of a silica layer and a mesoporous silica/carbon layer on an Rh nanoparticle followed by chemical etching with aqueous hydrofluoric acid to remove siliceous components. The use of various techniques for characterization of the structure showed that the powder thus-obtained had a rattle-like structure: Rh nanoparticles were encapsulated in the hollow carbon-shell having well-developed porosity. The porous wall structure of the lateral carbon shell provides channels and hydrophobic void spaces that allow efficient penetration and absorption of organic species present in aqueous media. This offers a microenvironment with a high concentration of organic substrates inside the shell. Moreover, the surfaces of medial Rh nanoparticles were free from any ligands, i.e., the active surface site(s) was exposed to induce organic transformations. These unique properties, which cannot be achieved by conventional Rh nanoparticles stabilized with organic agents, led to excellent catalytic activity for hydrogenation of various aromatic and heterocyclic rings in water.
机译：铑（Rh）纳米颗粒（核）-碳（壳）粉末是通过在Rh纳米颗粒上双层涂覆二氧化硅层和介孔二氧化硅/碳层，然后用氢氟酸水溶液进行化学蚀刻以去除硅质成分而制备的。使用各种技术表征结构表明，如此获得的粉末具有拨浪鼓状的结构：Rh纳米颗粒被封装在具有良好孔隙率的中空碳壳中。侧面碳壳的多孔壁结构提供了通道和疏水性空隙空间，可有效渗透和吸收水性介质中存在的有机物。这提供了在壳内部具有高浓度有机底物的微环境。此外，内侧Rh纳米颗粒的表面不含任何配体，即，暴露了活性表面位点以诱导有机转化。这些独特的特性是用有机试剂稳定的常规Rh纳米颗粒无法实现的，从而导致出色的催化活性，可用于水中各种芳香环和杂环的氢化。

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