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首页> 外文期刊>Catalysis science & technology >Iron-based nanoparticles embedded in a graphitic layer of carbon architectures as stable heterogeneous Friedel-Crafts acylation catalysts
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Iron-based nanoparticles embedded in a graphitic layer of carbon architectures as stable heterogeneous Friedel-Crafts acylation catalysts

机译：铁基纳米粒子嵌入石墨层碳结构的稳定异构傅克酰化催化剂

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摘要

A series of carbon supported iron nanoparticle composites were prepared by pyrolysis of two kinds of Fe-MOF materials, Fe-diamine-dicarboxylic acid and Fe-dicarboxylic acid, and were characterized by a variety of characterization techniques. The composites pyrolyzed at higher temperatures are composed of iron-based nanoparticles (Fe3C) and porous carbon architectures with graphitic characteristics. The catalytic properties of these composites were investigated for the Friedel-Crafts acylation of aromatic compounds with acyl chlorides. Among them, Fe@NC-800, derived from the pyrolysis of Fe-diamine-dicarboxylic acid at 800 degrees C, exhibited excellent catalytic activity and stability for the acylation reactions, and could be easily recycled several times without an obvious loss in activity. The excellent catalytic performance of Fe@NC-800 should be mainly attributed to the microstructural characteristics of the active sites, in which most of the small iron-based nanoparticles are encapsulated in the graphitic layer of the carbon architecture, thus providing a suitable geometric environment for stabilizing iron species. Besides, the electronic effects exerted by the graphitic layer of porous carbon may also play a positive role in improving the catalytic activity and stability of the carbon supported iron-based catalyst for Friedel-Crafts acylation reactions.
机译：一系列碳支持铁纳米颗粒复合材料是由热解两种种Fe-MOF材料,Fe-diamine-dicarboxylic酸和Fe-dicarboxylic酸,被各种各样的特征表征技术。在更高的温度是由正交铁基纳米粒子(Fe3C)和多孔碳架构与石墨的特征。这些复合材料的催化性能傅克酰化的调查芳香族化合物与酰氯化物。fe@nc - 800,来自的热解Fe-diamine-dicarboxylic酸在800摄氏度,表现出优良的催化活性和稳定的酰化反应,可以没有一个容易回收的几次明显的损失的活动。fe@nc - 800应该是主要的性能归因于微观结构特征的活跃的网站,大部分的小铁基纳米粒子中封装碳的石墨层架构,因此提供一个合适的几何环境稳定铁物种。由石墨层多孔施加影响在改善碳可能也发挥了积极作用的催化活性和稳定性碳铁基催化剂的支持傅克酰化反应。

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