N-Doped carbon nanotube-encapsulated metal nanoparticles are of great interest in heterogeneous catalysis owing to their improved mass transfer ability and superior stability. Herein, a facile one-pot pyrolysis approach using melamine as the carbon and nitrogen source was developed to fabricate metal nanoparticles embedded in bamboo-like N-doped carbon nanotubes (named as Co@NCNTs-600-800 and Ni@NCNTs-600-800). The optimized Co@NCNTs-600-800 catalyst exhibited outstanding activity in furfural (FAL) selective hydrogenation to furfuryl alcohol (FOL) or cyclopentanone (CPO) in aqueous media. High yields of FOL (100%) and CPO (75.3%) were achieved at 80 °C and 140 °C, respectively. Besides, this cobalt catalyst showed very good stability and recyclability during the reaction. The synergistic effect between metallic cobalt and N-doped carbon nanotubes was systematically investigated. In addition, the as-prepared Ni@NCNTs-600-800 catalyst also exhibited remarkable activity. Under optimal conditions (100 °C and 4 MPa H₂ pressure), a maximum tetrahydrofurfuryl alcohol (THFOL) yield (99.5%) was obtained in the aqueous-phase hydrogenation of FAL. The research thus highlights new perspectives for non-noble metal-based N-doped carbon nanotube catalysts for biomass transformation.

中文翻译：

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高度分散的Co和Ni纳米颗粒封装在N掺杂的碳纳米管中，可作为还原水相中不饱和氧化合物的有效催化剂†

N掺杂的碳纳米管包裹的金属纳米颗粒由于其提高的传质能力和出色的稳定性而在非均相催化中引起了极大的兴趣。在本文中，开发了一种以三聚氰胺为碳和氮源的简便的一锅法热解方法，以制造嵌入在竹状N掺杂碳纳米管（分别称为Co @ NCNTs-600-800和Ni @ NCNTs-600-）中的金属纳米颗粒。 800）。优化的Co @ NCNTs-600-800催化剂在糠醛（FAL）选择性加氢成糠醇（FOL）或环戊酮（CPO）的水性介质中表现出出色的活性。分别在80°C和140°C下获得了较高的FOL（100％）和CPO（75.3％）收率。此外，该钴催化剂在反应过程中显示出非常好的稳定性和可循环性。系统地研究了金属钴和氮掺杂碳纳米管之间的协同效应。另外，所制备的Ni @ NCNTs-600-800催化剂也表现出显着的活性。在最佳条件下（100°C和4 MPa H_在2个压力下），在FAL的水相氢化中获得最大的四氢糠醇（THFOL）产率（99.5％）。因此，该研究突出了用于生物质转化的非贵金属基N掺杂碳纳米管催化剂的新观点。