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首页> 外文期刊>Chemistry: A European journal >Colloidal noble-metal and bimetallic alloy nanocrystals: A general synthetic method and their catalytic hydrogenation properties
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Colloidal noble-metal and bimetallic alloy nanocrystals: A general synthetic method and their catalytic hydrogenation properties

机译：胶态贵金属和双金属合金纳米晶体：一般合成方法及其催化加氢性能

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摘要

A general single-step strategy has been developed for the direct thermal decomposition of noble-metal salts in octadecylamine to synthesize octahedron- and rod-shaped noblemetal aggregates and monodisperse noble-metal or bimetallic alloy nanocrystals without introducing any additive into the system. It has presented a facile and economic way to fabricate these nanocrystals, especially alloy nanocrystals, which does not require a post-synthesis solid-state annealing process. The morphology of the nanocrystals can be easily controlled by tuning the synthetic temperature. Their ability to catalyze heterogeneous Suzuki coupling reactions has been investigated and showed satisfactory catalytic activity. The catalytic performanee of the monometallic and bimetallic alloy nanocrystals were also evaluated in the selective hydrogenation of citral in a conventional organic solvent (toluene) and a green solvent (supercritical carbon dioxide, scCO_2). Interestingly, the catalysts performed differently to each other when they were in ScCO_2 owing to the different morphology, which should be readily optimized for further use.
机译：已开发出一种通用的单步策略，用于在十八烷基胺中直接热分解贵金属盐，以合成八面体和棒状的贵金属聚集体，以及单分散的贵金属或双金属合金纳米晶体，而无需向系统中引入任何添加剂。它提供了一种简便且经济的方法来制造这些纳米晶体，尤其是合金纳米晶体，不需要合成后的固态退火工艺。可以通过调节合成温度来容易地控制纳米晶体的形态。已经研究了它们催化异质Suzuki偶联反应的能力，并显示出令人满意的催化活性。在常规有机溶剂（甲苯）和绿色溶剂（超临界二氧化碳，scCO_2）中柠檬醛的选择性加氢中，还评估了单金属和双金属合金纳米晶体的催化性能。有趣的是，由于催化剂的形态不同，当它们在ScCO_2中时，它们的性能彼此不同，应易于优化以进一步使用。

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