Chinese Journal of Catalysis ›› 2019, Vol. 40 ›› Issue (10): 1557-1565.DOI: 10.1016/S1872-2067(19)63416-9

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In situ synthesis of Fe-N-C catalysts from cellulose for hydrogenation of nitrobenzene to aniline

Hao Wanga, Xiaohao Liua, Guangyue Xua, Ziwei Guoa, Ying Zhanga,b   

  1. a Department of Chemistry, University of Science and Technology of China, Hefei 230026, Anhui, China;
    b Dalian National Laboratory for Clean Energy, Dalian 116023, Liaoning, China
  • Received:2019-04-28 Revised:2019-05-27 Online:2019-10-18 Published:2019-08-26
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51876200, 21572213), and the DNL Cooperation Fund, CAS (DNL180301).

Abstract: Owing to Fe being the most abundant and least expensive transition metal on the earth, the utilization of Fe-based catalysts for catalytic hydrogenation has attracted worldwide attention. In this work, a series of N-doped C supported Fe catalysts (Fe-N-C) were prepared by co-pyrolysis of cellulose and ferric chloride under ammonia atmosphere. Characterization methods such as elemental analysis, atomic absorption spectroscopy, nitrogen adsorption-desorption isotherms, transmission electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy were carried out to explore the physicochemical properties of the catalysts. Using hydrogenation of nitrobenzene as a model reaction, the catalysts prepared at different pyrolysis temperatures displayed different activities. Fe-N-C-700 exhibited the best activity among these catalysts, with the yield of aniline being up to 98.0% under 5 MPa H2 at 120℃ after 12 h. Combined with the results of catalyst characterization and comparative tests, the transformation of Fe species and the generation of N-doped C, especially graphitized N-doped C, in the catalyst may be the main factors affecting the activity. A kinetic study was carried out and the apparent activation energy was obtained as 31.53 kJ/mol. The stability of the catalyst was also tested and no significant decrease in the activity was observed after 5 runs.

Key words: Co-pyrolysis, Iron, Nitrogen-doped, Carbon, Hydrogenation