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Carbon nanofibres coated with Ni decorated MoS2 nanosheets as catalyst for vacuum residue hydroprocessing

AuthorsPinilla Ibarz, José Luis ; Purón, Holda; Torres Gamarra, Daniel; Llobet, Saúl de; Moliner Álvarez, Rafael; Suelves Laiglesia, Isabel ; Millan, Marcos
KeywordsCarbon nanofibers
Vacuum residue
Issue Date21-Nov-2013
PublisherElsevier BV
CitationApplied Catalysis B: Environmental 148-149: 357-365 (2014)
AbstractCatalysts based on functionalised 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), N2 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°C, non-uniform covering of the carbon nanofiber (CNF) was observed together with the presence of small round-shaped metal particles (ca. 20nm). On the other hand, at 450°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°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.
Description9 págs.,7 figures, 3 tables
Publisher version (URL)http://dx.doi.org/10.1016/j.apcatb.2013.11.019
Identifiersdoi: 10.1016/j.apcatb.2013.11.019
issn: 0926-3373
Appears in Collections:(ICB) Artículos
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