Deep Desulphurization Study of Liquid Fuels Using Acid Treated Activated Charcoal as Adsorbent

The current study addresses the improved desulphurization activity of activated: charcoal modified by acetic acid treatment. The modified activated charcoal was investigated as an adsorbent for the elimination of sulfur compounds from-the model oil (consisting of dibenzothiophene (DBT) dissolved in cyclohexane) as well as real oil samples including kerosene and diesel oil. In the case of model. oil, about 99.5% of DBT was removed under conditions optimized in the laboratory, which included 15 mL feed (model oil) volume, 0.8 g of adsorbent, 60 degrees C temperature, stirring speed of 100 rpm, and contact time of h under neutral pH. In the case of teal oil samples, i.e., kerosene and diesel oil, sulfur-removal of 78.69% and 74.29% was attained under optimized Conditions; respectively: Experimental results were interpreted: through model adsorption isotherms, which indicated that the adsorption process is in close agreement with the Langmuir adsorption isotherm in comparison-to the Freundlich adsorption isotherm: The:spent adsorbents were regenerated to view their repeated use, simply by washing separately with organic solvents such as toluene, acetonitrile, Methanol, and chloroform. Among-these, toluene was found to be the best solvent for the regeneration of the-spent adsorbents. The regenerated adsorbents were reused and regenerated for six consecutive regeneration cycles.