Lignin-Based Fabrication of Co@C Core–Shell Nanoparticles as Efficient Catalyst for Selective Fischer–Tropsch Synthesis of C5+ Compounds

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• 作者：Hengfei Qin ; Shifei Kang ; Yangang Wang ; Huan Liu ; Zhijiang Ni ; Yongkui Huang ; Yaguang Li ; Xi Li
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2016
• 出版时间：March 7, 2016
• 年：2016
• 卷：4
• 期：3
• 页码：1240-1247
• 全文大小：533K
• ISSN：2168-0485

文摘

Novel Co@C core–shell nanoparticles were prepared by a straightforward low-temperature carbonization process. The industrially available lignin was used as a low-cost biorenewable carbon source for the first time. The products were characterized by X-ray diffraction, energy-dispersive X-ray spectrometry, transmission electron microscopy, nitrogen adsorption–desorption, and Raman spectrum. The results showed that the synthesized Co@C catalysts had a well-defined core–shell structure with a moderate degree of graphitization, and the metal Co nanoparticles with the sizes of 20–150 nm were wrapped by several layers of graphitic carbon. This unique core–shell structure is useful in a Fischer–Tropsch reaction since it can provide high adsorption space and the graphite carbon layer defects are beneficial for H₂ dissociative adsorption. Furthermore, the shell of graphitic carbon layers could restrict the aggregation of the cobalt nanoparticles during the activation and reaction processes. Fischer–Tropsch synthesis results showed that the Co@C core–shell catalysts had a high catalytic performance with the highest C₅₊ selectivity up to 56.8%, which is much higher compared with the traditional Co/AC catalyst (46.2%).