Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 148, Issue -, Pages 357-365Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2013.11.019
Keywords
Carbon nanofibers; MoS2; Vacuum residue; Hydroprocessing
Funding
- Spanish MEC [EX2009-0822]
- CSIC [0439]
- CONACYT Mexico
- DGA (Spain)
- FEDER
- Spanish Ministery of Economy and Competitiveness [ENE2011-28318-C03-01]
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Catalysts based on functionalisecl carbon nanofibers (FCNF) coated with Ni-decorated MoS2 nanosheets were obtained by direct decomposition of ammonium thiomolybdate and nickel nitrate impregnated on the FCNF under controlled temperature conditions in inert atmosphere. The catalysts were characterised by X-ray diffraction (XRD), N-2 adsorption, Raman spectroscopy, temperature programmed reduction of sulfur species (TPR-S), NH3 temperature programmed desorption (NH3-TPD) and transmission electron microscopy (TEM). Decomposition temperature was found to have a paramount importance in the formation of uniform MoS2 slabs, as revealed by the TEM study: at 600 degrees C, non-uniform covering of the carbon nanofiber (CNF) was observed together with the presence of small round-shaped metal particles (ca. 20 nm). On the other hand, at 450 degrees C CNF appeared homogeneously covered by amorphous MoS2 slabs decorated with Ni, resulting in higher amount of coordinated unsaturated sites (CUS), as determined by TPR-S. Catalysts were tested in the hydroprocessing of a vacuum residue and the results were compared against a benchmark alumina-supported NiMo catalyst. Higher asphaltene conversions were obtained for the CNF-supported catalysts prepared at 450 degrees C, which overperformed the Al2O3-supported benchmark catalyst. However, the catalytic performance in hydrodesulfurisation and hydrodemetallisation of the CNF-based catalysts was slightly lower than that of the benchmark catalyst. (C) 2013 Elsevier B.V. All rights reserved.
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