Síntesis y caracterización de heteropolioxometalatos tipo anderson de Ni-Mo(w) soportados sobre alúmina: actividad de hidrodesulfuración de tiofeno

• Main Authors: Javier José Julio-Julio, Esneyder Puello-Polo, Joaquín Brito
• Format: Article
• Language: English
• Published: Universidad Santo Tomás 2016-04-01
• Series: Iteckne
• Subjects: heteropolioxometalatos tipo anderson; hidrodesulfuración; precursor oxídicos; nimo(w)
• Online Access: http://revistas.ustabuca.edu.co/index.php/ITECKNE/article/view/1380

Alumina supported (NH4)4[NiMo6-xWxO24H6]•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.