Abstract

JULIO-JULIO, Javier José; PUELLO-POLO, Esneyder  and  BRITO, Joaquín. Synthesis and characterization of alumina supported Ni-Mo(W) anderson type heteropolyoxoanions: Thiophene hydrodesulfurization activity. Iteckne [online]. 2016, vol.13, n.1, pp.36-43. ISSN 1692-1798.

Alumina supported (NH₄)₄[NiMo_6-xW_xO₂₄H₆]·5H₂O Anderson type heteropolyoxometalates were synthesized by coprecipitation. These solids were used as precursors in the thiophene hydrodesulfurization catalytic at 400°C. The catalytic precursors were characterized by textural properties (BET specific surface area and, total pore volume and pore diameter distribution), X-ray diffraction (XRD), IR spectroscopy (FTIR) and S analysis (CHON-S). The specific surface area was between 109 and 35 m²/g with total pore volume and pore diameter distribution of 0,11-0,34 cm³/g and 8,9-9,6 nm, respectively. XRD showed the presence of NiWO₄, (NH₄)₄[NiMo₆O₂₄H₆]·5H₂O and WO₃. FTIR analysis can be assigned to the characteristic vibrations of Anderson-type structure, due to stretching and bending of the functional groups present. The NiMo₆-O/Al precursor was the most active in the HDS, it had a conversion of 72,75% and was even more active than the AERO commercial catalyst. The results of HDS revealed that the catalytic activity increases as follows: NiMo₆-O/Al > AERO > NiMo₃W₃-O/Al > NiW₆-O/Al. The catalytic selectivity of precursors and commercial catalyst (AERO) was directed towards the cis-butene.

Keywords : Anderson type heteropolyoxometalates; hydrodesulfurization; oxidic precursor; NiMo(W).

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