Sandwiched ruthenium/carbon nanostructures for highly active heterogeneous hydrogenation
Sandwiched ruthenium/carbon nanostructures for highly active heterogeneous hydrogenation
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DOI：
10.1002/adfm.200700067
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发表时间：
2007-08-13
影响因子：
19
通讯作者：
Zhao, Xiu Song
中科院分区：
文献类型：
--
作者：
Su, Fabing;Lee, Fang Yin;Zhao, Xiu Song
将金属纳米颗粒固定在多孔碳框架中进行多相催化可以避免颗粒聚集、移动和浸出，从而获得高催化效率。在这篇全文中，展示了一种制备掺入多孔碳孔壁中的 Ru 纳米颗粒的方法，以形成夹层 Ru/C 纳米结构，用于异质氢化。采用氮的物理吸附、X射线衍射、热重分析、场发射透射电子显微镜、场发射扫描电子显微镜和能量色散X射线光谱技术来研究催化剂的结构和形貌。催化结果表明，夹在多孔碳孔壁中的Ru纳米粒子在苯加氢中表现出极高的活性和稳定性。由于Ru纳米颗粒和碳载体之间的紧密界面接触，增强的氢溢出效应被认为在氢化反应中发挥重要作用。这项工作中描述的催化剂体系可能为优化催化剂纳米结构提供新的概念。
The immobilization of metal nanoparticles in the framework of porous carbon for heterogeneous catalysis may avoid particle aggregation, movement, and leaching, thus leading to a high catalyst efficiency. In this Full Paper, an approach to prepare Ru nanoparticles incorporated into the pore walls of porous carbon to form a sandwiched Ru/C nanostructure for heterogeneous hydrogenation is demonstrated. Physical adsorption of nitrogen, X-ray diffraction, thermogravimetric analysis, field-emission transmission electron microscopy, field-emission scanning electron microscopy, and energy dispersive X-ray spectroscopy techniques are employed to study the structure and morphology of the catalysts. Catalytic results show that the Ru nanoparticles sandwiched in the pore walls of porous carbon display a remarkably high activity and stability in the hydrogenation of benzene. An enhanced hydrogen spillover effect is believed to play a significant role in the hydrogenation reaction because of the intimate interfacial contact between Ru nanoparticles and the carbon support. The catalyst system described in this work may offer a new concept for optimizing catalyst nanostructures.