Resumen

GUTIERREZ, A. W. et al. Synthesis and characterization of Mo-blue-based CoMo/Al₂O₃ catalysts. J. appl. res. technol [online]. 2022, vol.20, n.3, pp.331-346.  Epub 17-Feb-2023. ISSN 2448-6736.  https://doi.org/10.22201/icat.24486736e.2022.20.3.1064.

Saccharose (SA) and citric acid (CA) were used as additives in P-doped CoMo/Al2O3 catalysts (Mo, Co and P at 12, 3, and 1.6 wt%, respectively). One-pot impregnating solutions were prepared by MoO3 digestion in aqueous H3PO4, followed by C4H6CoO4•4H2O addition. Organics were added (SA/Co=1, CA/Co=2) at two different preparation stages to assess the effect of that step on catalysts properties. Method I: SA or CA was added in as-prepared Co-Mo-P impregnating solution, followed by pore-filling impregnation of alumina support. Method II: SA or CA at aforementioned concentrations was impregnated on the pristine carrier, followed by drying (120 ºC, 2 h). Co-Mo-P phases were further deposited on modified supports through corresponding one-pot solutions. All materials were dried (120 ºC) but not calcined. Cobalt complexation by CA and Mo-blue ligand to metal charge transfer complex formation (SA-modified solids) were identified (UV-vis, oxidic samples). Partially reduced molybdenum (Mo6+ => Mo5+, by XPS) was observed after organics addition that being more evident in SA-modified solids. Materials were gas-phase sulfided (H2S/H2 10%, 400 °C, 2 h) then studied by HR-TEM. Co-Mo-P phases impregnation in one-pot solution simultaneously deposited with SA rendered the materials of the highest MoS2 dispersion.

Palabras llave : Saccharose; citric acid; complexation; Mo-blue; CoMo/Al₂O₃.