EFECTO DE LA MODIFICACIÓN DEL SOPORTE CON GALIO Y LA PROMOCIÓN CON VANADIO EN LA HIDROSULFURACIÓN DE DIBENZOTIOFENO UTILIZANDO CATALIZADORES NiMoV-S/Al2O3-Ga2O3

Authors

DOI:

https://doi.org/10.15665/rp.v22i2.3441

Keywords:

hydrodesulfurization, Gallium, Vanadium, Anderson-type heteropolymolybdate synthesis method.

Abstract

The effect of support modification with nickel and promotion with copper on the competitive reaction of DBT hydrodesulfurization and carbazole hydrodesnitrogenation using NiMoV-S/Al2O3-Ga2O3 catalysts was evaluated. The catalysts were characterized by X-ray fluorescence (FRX), specific surface area (BET), Fourier-transform infrared spectroscopy (FT-IR), temperature-programmed reduction (TPR), and determination of acidic sites. FRX showed that the Mo/Ni atomic ratio was 6.2 and 5.2 for methods 1 and 2, respectively. Adsorption-desorption isotherms confirmed the formation of mesoporous materials with specific areas ranging from 124 to 272 m2/g. FTIR revealed the presence of stretches attributable to polyoxomolybdates for all catalysts and the modification of supports with gallium showed Ga-O-Ga and Ga-O-Al assignments, while unmodified alumina exhibited characteristic signals of Al-O (AlO4 and AlO6) and O=Al-OH. TPR indicated increased metal-support interaction for NiMoV-S/Al and NiMoV-S/Al-Ga-M2 related to the modification method and the presence of V. Both catalysts and support exhibited weak and very weak acidity, respectively. The catalyst obtained through method 1 was more active for DBT removal: NiMoV-S/Al-Ga-M2 < NiMo/Al < NiMoV-S/Al-Ga-M1 with global pseudo-first-order rate constants (k) of 1.86, 2.48, and 8.50 L/(h·mol·m2), respectively.

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2024-10-23

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Vol. 22 No. 2 (2024): Julio - Diciembre

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