Citation: Ruijie Gao, Lun Pan, Zhengwen Li, Xiangwen Zhang, Li Wang, Ji-Jun Zou. Cobalt nanoparticles encapsulated in nitrogen-doped carbon for room-temperature selective hydrogenation of nitroarenes[J]. Chinese Journal of Catalysis, ;2018, 39(4): 664-672. doi: 10.1016/S1872-2067(17)62988-7 shu

Cobalt nanoparticles encapsulated in nitrogen-doped carbon for room-temperature selective hydrogenation of nitroarenes

Ruijie Gao ^a,b, ,
Lun Pan ^a,b ,
Zhengwen Li ^a ,
Xiangwen Zhang ^a,b ,
Li Wang ^a,b ,
Ji-Jun Zou ^a,b

a Key Laboratory for Green Chemical Technology of the Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
b Collaborative Innovative Center of Chemical Science and Engineering(Tianjin), Tianjin 300072, China

Received Date: 29 November 2017
Revised Date: 22 December 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (U1462119) and the Tianjin Municipal Natural Science Foundation (16JCQNJC05200).

Here, we report cobalt nanoparticles encapsulated in nitrogen-doped carbon (Co@NC) that exhibit excellent catalytic activity and chemoselectivity for room-temperature hydrogenation of nitroarenes. Co@NC was synthesized by pyrolyzing a mixture of a cobalt salt, an inexpensive organic molecule, and carbon nitride. Using the Co@NC catalyst, a turnover frequency of~12.3 h^-1 and selectivity for 4-aminophenol of >99.9% were achieved for hydrogenation of 4-nitrophenol at room temperature and 10 bar H₂ pressure. The excellent catalytic performance can be attributed to the cooperative effect of hydrogen activation by electron-deficient Co nanoparticles and energetically preferred adsorption of the nitro group of nitroarenes to electron-rich N-doped carbon. In addition, there is electron transfer from the Co nanoparticles to N-doped carbon, which further enhances the functionality of the metal center and carbon support. The catalyst also exhibits stable recycling performance and high activity for nitroaromatics with various substituents.
- Cobalt nanoparticle,
- Nitrogen-doped carbon,
- Nitroarenes,
- Selective hydrogenation,
- Hydrogen activation,
- Heterogeneous catalysis
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