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• W3216365280 endingPage "133863" @default.
• W3216365280 startingPage "133863" @default.
• W3216365280 abstract "• Highly dispersed Ru NPs on N-doped carbon with high surface area. • Superior performance of nitrobenzene hydrogenation at room temperature. • N-doping was crucial for regulating electron environment of Ru. • Ru-pyrrolic-N x enhanced nitrobenzene adsorption and H 2 dissociation. • Ru/N-doped exhibited superior performance for various nitroaroamtic compounds. An efficient catalyst for chemoselective hydrogenation of nitroaromatics to produce aromatic amines under mild conditions is highly desirable. In this work, a series of N-doped carbon (NC-x) with high nitrogen contents were firstly synthesized by pyrolysis of 1-butyl-3-vinylimidazolium bromide-co-acrylonitrile with a template of g-C 3 N 4 . Furthermore, Ru/NC-x catalysts were successfully prepared by ultrasonic-assisted impregnation method. The catalysts were characterized by various methods in detail, e.g.X-ray diffraction, N 2 physical adsorption-desorption, Transmission electron microscopy, Raman spectra, Scanning electron microscopy and H 2 temperature programmed reduction. Characterization results revealed that N-doping on carbon contributed to the high dispersion of Ru nanoparticles and resulted in the forming of the electron-deficient of Ru species. Nanosheet Ru/NC-2 with high N-doping content of 28 wt% exhibited superior performance under room temperature, i.e., nitrobenzene conversion >99.0% and aniline selectivity 98.4%. Kinetic study indicated that the hydrogenation of nitrobenzene over Ru/NC-2 was the first-order kinetics with an intrinsic activation energy of 43.7 kJ/mol. Density functional theory calculation results suggested that Ru-N x species, especially, Ru-pyrrolic-N facilitated nitrobenzene adsorption and H 2 dissociation, resulting in enhanced catalytic performance. In addition, the excellent stability of Ru/NC-2 made it essentially reserved for 410 h in the fixed-bed reactor. Moreover, Ru/NC-2 exhibited superior performance for the hydrogenation of various nitroaromatics to corresponding aromatic amines. This work could provide meaningful guidance on designing effective and stable catalyst for chemoselective hydrogenation of nitroaromatics to aromatic amines under mild conditions." @default.
• W3216365280 created "2021-12-06" @default.
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• W3216365280 date "2022-03-01" @default.
• W3216365280 modified "2023-10-09" @default.
• W3216365280 title "Highly dispersed Ru anchored on nanosheet N-doped carbon for efficient and chemoselective hydrogenation of nitroaromatics to aromatic amines under mild conditions" @default.
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• W3216365280 doi "https://doi.org/10.1016/j.cej.2021.133863" @default.
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