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Open AccessArticle

Ni/NiO Nanocomposites with Rich Oxygen Vacancies as High-Performance Catalysts for Nitrophenol Hydrogenation

by Jun Zhou 1, Yue Zhang 1, Song Li 1,* and Jing Chen 2,*
1
Key Lab for Anisotropy and Texture of Materials (MoE), School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
2
Institute of Microscale Optoelectronics (IMO), Shenzhen University, Shenzhen 518060, China
*
Authors to whom correspondence should be addressed.
Catalysts 2019, 9(11), 944; https://doi.org/10.3390/catal9110944
Received: 20 October 2019 / Revised: 7 November 2019 / Accepted: 9 November 2019 / Published: 11 November 2019
(This article belongs to the Section Nanostructured Catalysts)
Heterogeneous catalysis often involves charge transfer between adsorbed molecules and the surface of catalyst, and thus their activity depends on the surface charge density. The efficiency of charge transfer could be optimized by adjusting the concentration of oxygen vacancies (Ov). In this work, hexagonal Ni(OH)2 nanoparticles were initially synthesized by a hydrothermal process using aluminum powder as the sacrificial agent, and were then converted into 2D Ni/NiO nanocomposites through in situ reduction in hydrogen flow. The oxygen vacancy concentration in the NiO nanosheet could be well-controlled by adjusting the reduction temperature. This resulted in strikingly high activities for hydrogenation of nitrophenol. The Ni/NiO nanocomposite could easily be recovered by a magnetic field for reuse. The present finding is beneficial for producing better hydrogenation catalysts and paves the way for the design of highly efficient catalysts. View Full-Text
Keywords: metal-oxide interaction; oxygen vacancy; hydrogenation; catalyst metal-oxide interaction; oxygen vacancy; hydrogenation; catalyst
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Zhou, J.; Zhang, Y.; Li, S.; Chen, J. Ni/NiO Nanocomposites with Rich Oxygen Vacancies as High-Performance Catalysts for Nitrophenol Hydrogenation. Catalysts 2019, 9, 944.

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