Síntesis y caracterización de nitruros y carburos de vanadio

two vanadium carbides catalysts (cv-a and cv-a) were prepared using two carburation gas mixture flows (660 and 8 ml/min, respectively) and a vanadium nitride (nv) catalyst was also prepared with a 660 ml/min of nh3 flow. the catalysts were characterized by x-ray diffraction, nitrogen adsorption, n-butylamine potentiometric titration techniques and their acid and catalytic properties were tested in 2-propanol dehydration, hydrodesulphurization of thiophene and a heavy gas oil. heavy gas oil hydrodesulphurization was carried out with the vanadium carbide prepared at 660 ml/min of carburation gas mixture and with the vanadium nitride catalysts. results obtained in 2-propanol dehydration indicate that both vanadium carbides have acid properties with the prevalence of weak acid sites, while the vanadium nitrides have acid-base properties. in the thiophene hydrodesulphurization, the vanadium carbide prepared with 8 ml/min of ch4/h2 gas mixture was the most active catalysts, this catalyst shows a crystalline phase mixture. in the gas oil hydrodesulphurization the vanadium carbide "cv-a" was more active than the vanadium nitride, with a 40 wt % of sulphur remotion and a 51 wt % of nitrogen remotion.