Synthesis and characterization of Mo-blue-based sulfided CoMo catalysts for guaiacol HDO

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José Escobar
Ana W. Gutiérrez, Miss
Paz Del Ángel, Dr.
María C. Barrera, Dr.
Víctor Santes, Dr.
Carlos E. Santolalla, Dr.
Dora A. Solís Casados, Dr.

Abstract

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) intended to be applied in guaiacol hydrodeoxygenation (HDO). 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 °C, 2 h). Co-Mo-P phases were further deposited on modified supports through corresponding one-pot solutions. All materials were dried (120 °C) but not calcined. Cobalt complexation by CA and Mo-blue LMCT complex formation (SA-modified solids) were identified (UV-vis, oxidic samples). Partially reduced molybdenum (Mo6+ => Mo5+, by XPS) was observed after either organics addition that effect being more evident in SA-modified solids. Materials were gas-phase sulphided (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.

 

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How to Cite
Escobar, J., Gutiérrez, A., Del Ángel, P., Barrera, M., Santes, V., Santolalla, C., & Solís Casados, D. (2022). Synthesis and characterization of Mo-blue-based sulfided CoMo catalysts for guaiacol HDO. Journal of Applied Research and Technology, 20(3), 331-346. https://doi.org/10.22201/icat.24486736e.2022.20.3.1064