Chinese Journal of Catalysis

Chinese Journal of Catalysis ›› 2014, Vol. 35 ›› Issue (6): 906-913.DOI: 10.1016/S1872-2067(14)60116-9

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Nitrogen-doped carbon nanotubes on silicon carbide as a metal-free catalyst

Cuong Duong-Vieta,b, Housseinou Baa, Yuefeng Liua, Lai Truong-Phuoca, Jean-Mario Nhuta, Cuong Pham-Huua   

  1. a Institute of Chemistry and Processes for Energy, Environment and Health (ICPEES), ECPM, UMR 7515 du CNRS-University of Strasbourg, 25 rue Becquerel, 67087 Strasbourg Cedex 02, France;
    b Hanoi University of Mining and Geology, Dong Ngac, Tu Liem, Hanoi, Viet Nam
  • Received:2014-03-31 Revised:2014-04-21 Online:2014-05-30 Published:2014-06-03

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Abstract:

A hierarchical metal-free catalyst consisting of nitrogen-doped carbon nanotubes decorated onto a silicon carbide (N-CNTs/SiC) macroscopic host structure was prepared. The influence of N-CNTs incorporation on the physical properties of the support was evaluated using different characterization techniques. The catalyst was tested as a metal-free catalyst in the selective oxidation of H2S and steam-free dehydrogenation of ethylbenzene. The N-CNTs/SiC catalyst exhibited extremely good desulfurization performance compared to a Fe2O3/SiC catalyst under less conducive reaction conditions such as low temperature, high space velocity, and a low O2-to-H2S molar ratio. For the dehydrogenation of ethylbenzene, a higher dehydrogenation activity was obtained with the N-CNTs/SiC catalyst compared to a commercial K-Fe/Al2O3 catalyst. The N-CNTs/SiC catalyst also displayed good stability as a function of time on stream for both reactions, which was attributed to the strong anchoring of the nitrogen dopant in the carbon matrix. The extrudate shape of the SiC support allowed the direct macroscopic shaping of the catalyst for use in a conventional fixed-bed reactor without the problems of catalyst handling, transportation, and pressure drop across the catalyst bed that are encountered with nanoscopic carbon-based catalysts.

Key words: Nitrogen-doped carbon nanotubes, Silicon carbide, Selective oxidation, H2S, Dehydrogenation, Ethylbenzene