Abstract
Hydrodesulfurization (HDS) experiments were carried out over a commercial Co-Mo-Al 2O 3 catalyst in a continuous-flow reactor at atmospheric pressure and temperatures of 250 and 350 °C. The reactants were hydrogen and benzothiophene (BT) dissolved in n-dodecane. The effects of pretreating conditions on catalytic activity were investigated by following BT conversion as a function of run time. It was shown that stationary activities differed notably with pretreatment conditions and temperature. Contrary to the results at 400 °C, prereduction at 250 °C was inadequate to promote rapid HDS activity. Presulfiding at 250 °C (following prereduction or not) led to formation of a highly active catalyst. Presulfiding at 350 °C or processing at 350 °C gave lesser activities than in the same pretreating conditions at 250 °C. The results are explained in terms of the poisoning phenomena of active sites by hydrocarbon molecules and the role of catalyst presulfiding, which at the same time causes an increase of HDS activity as well as a protecting effect against poisoning, is discussed.
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