INFLUENCE OF K₂O AND MgO DOPING ON CoMo-Cu/Al₂O₃ CATALYST FOR THE HYDRODEOXYGENATION OF GUAIACOL
DOI:
https://doi.org/10.15665/rp.v24i1.3787Keywords:
CoMo₆-Cu/Al₂O₃ catalysts, K2O, MgO, Co-Mo Anderson phase, hydrodeoxygenation.Abstract
In this study, the textural, structural, and morphological properties, as well as the catalytic activity, of CoMo₆-Cu/Al₂O₃ catalysts modified with K₂O and MgO were analyzed during the hydrodeoxygenation (HDO) of guaiacol. BET analysis revealed that the incorporation of MgO significantly decreased the surface area (215 m²/g) and pore volume (0.350 cm³/g) compared to the K₂O-doped catalyst, which exhibited higher values (252 m²/g and 0.432 cm³/g), likely due to partial pore blockage by MgO. X-ray diffraction patterns confirmed the predominant presence of γ-Al₂O₃ in all samples, with crystalline MgO phases detected in Al₂O₃-MgO. In contrast, K₂O was not detected in Al₂O₃-K₂O, suggesting a high surface dispersion of potassium. HRTEM micrographs showed a lamellar MoS₂ structure, with greater crystallite lengths (5.32 nm) and stacking numbers (4.48) in the MgO-containing catalyst, compared to 3.64 nm and 2.46 layers in the K₂O-doped sample, indicating a higher density of active edge and corner atoms. Regarding catalytic performance, CoMo₆-Cu/Al₂O₃ exhibited the highest guaiacol conversion (99.6%) and selectivity to phenol (74.5%), while K₂O favored xylene formation (82.8%) and MgO enhanced cresol production (31.5%). These results indicate that the type of dopant significantly influences the catalyst structure and behavior, leading to distinct reaction pathways.
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