ABSTRACT
Two most important groups of inhibitors in hydrodesulfurization (HDS) are aromatic hydrocarbons and H2S. Some studies have reported that H2S inhibited HDS of dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT). This chapter investigates the kinetics of HDS of DBT and 4,6-DMDBT over the laboratory prepared sulfided cobalt molybdenum supported on active carbon catalyst (Co-Mo/C). It presents detailed kinetic analysis of inhibition of HDS by naphthalene, as an aromatic inhibitor, and H2S for respective reactions to suggest natures of active sites on the catalyst in the presence or absence of H2S and aromatic components. Co-Mo/C catalyst was prepared by impregnation by a two step procedure in which the molybdenum phase was introduced first followed by drying in vacuum at 120°C overnight. The next step is the addition of cobalt phase to this precursor, followed by the same treatment as that used for molybdenum. The reactor used for catalytic activity measurements was a laboratory made 100cm magnetically stirred micro-autoclave.
