Kinetics of Hydrodesulfurization of Dibenzothiophene on Sulfided Commercial Co-Mo/γ-Al2O3 Catalyst

Abstract

Kinetics of hydrodesulfurization of dibenzothiophene (DBT) has been studied on a commercial CoMo/γ-Al 2 O 3 catalyst at 633 -683 K and 10 atm. A low DBT concentration typically obtained in hydrodesulfurization operations was used. Pseudo-first-order model was found to fit the experimental data for the consumption of DBT. The activation energy for the conversion of DBT was found to be 51.7 kcal/mol. Biphenyl (BP) and cyclohexylbenzene (CHB) were obtained as dominant products. For the reaction network, both parallel and parallel-sequential routes were explored. The latter was found to give a better description of the BP and CHB distributions. The ratio of BP to CHB depended on the reaction temperature. The values of activation energies of DBT hydrogenolysis to BP (E BP ), DBT hydrogenation to CHB (E CHB1 ) and hydrogenation of BP to CHB (E CHB2 ) were found to be in a decreasing order of E CHB2 > E BP > E CHB1 . The result suggests the presence of different catalytic sites leading to the two products on the catalysts.

Mathematical modeling of the process of hydrotreating diesel fuel from organosulfur impurities

“…Instead, the total sulfur content of the feed stock is often used in calculations as characterize the raw materials. In many cases, in the experimental study of the hydrotreatment process, there was used a feed stock model, in which dibenzothiophene was presented as the only generalizing hydrogenated component instead of a set of organosulfur impurities [14][15][16][17] (figure 1b).…”

Hydrodesulfurization of Gas Condensate containing Di-Sulfide Oil: Catalyst synthesis and evaluation

“…There are various methods for desulfurization of crude oil and its derivatives [10][11][12][13][14][15]. Although Tanimu et al generally reviewed the hydrodesulfurization (HDS) process which is the most efficient commercial technique but, the other researchers focused on the Co (Ni) Mo/Al 2 O 3 as catalyst for the hydrodesulfurization process [16][17][18][19]. In fact, the hydrodesulfurization is a reaction between sulfur compounds and hydrogen.…”