MODIFIED ACTIVATED CHARCOAL AS SUPPORT OF PROTOTYPE HDS CATALYSTS
With the purpose of improving their adsorbent, acid and textural properties, two commercial activated carbons (CA), lignite and coconut shell, were submited to a thermal treatment at 300-500°C, and then treated with HNO3 solutions at 30 and 80ºC in order to be used as supports of prototype catalysts to hydrotreat light and heavy petroleoum distillates. Modified carbons were loaded with Ni and Mo to have an atomic ratio of Ni/(Ni+Mo) = 0.3 by means of the incipient wetness method. Specific surface area and total pore volume of the materials were determined using the low temperature N2 adsorption technique, and their total acidity by n-butylamine potentiometric titration and the 2-propanol dehydration reaction test. Catalytic activity of the NiMo/CA materials was measured in the hydrodesulfurization (HDS) of thiophene and atmospheric gas oil. Both charcoals showed good thermal stability. A correlation between the total acidity measured by n-butylamine potentiometric titration and by 2-propanol dehydration, and the HNO3 solution concentration was observed. NiMo/Modified charcoals at 80ºC showed in the HDS of thiophene a more positive effect than those treated at 30ºC. Promising results were obtained in the hydrotreatment (HT) of the atmospheric gas oil.
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