Kinetics of the hydrodesulfurization on a cobalt-molybdenum/.gamma.-alumina catalyst. 2. Kinetics of the hydrogenolysis of benzothiophene

Abstract

The kinetics of the hydrogenolysis of benzothiophene on a commercial CoMoly-Al,O, catalyst were studied in a tubular reactor. A sequential design of the experimental program was used for both the model discrimination and precise parameter estimation. Model selection was effectively achieved among 16 rival sets of rate equations of the Hougen-Watson type for both the hydrogenolysis of benzothiophene into ethylbenzene and the hydrogenation of benzothiophene into dihydrobenzothiophene with subsequent hydrogenolysis into ethylbenzene. The procedure was carried out at 513, 533, 553, and 573 K. The concerted surface reaction between benzothiophene or dihydrobenzothiiphene and two competitively adsorbed hydrogen atoms was found to be the ratedetermining step, a conclusion close to that arrived at in the study of thiophene hydrogenolysis.

Vegetable oil effect on gasoil HDS in their catalytic co-hydroprocessing

“…The hydrogenation route is the same as the hydrogenation route of the unsaturated hydrocarbons. Moreover, the hydrogenolysis route on CoMo/Al 2 O 3 catalysts appears to be much faster than the hydrogenation one [19]. Therefore, the results presented in Fig.…”

Rhenium Effect on the Performance of CoMoNi/γ‐Al2O3 Catalyst in Thiophene Hydrodesulphurization. Performance Evaluation and Process Kinetics

“…The second path is considering the direct desulfurization (hydrogenolysis, HDS) of thiophene to butadiene. In both pathways, the butadiene is subsequently hydrogenated to butene isomers and finally to butane [25] . As reported by Van Parijs, Hosten and Froment, [25] HYD and HDS occurs on different active sites, the first one on σ sites, whereas the latter on τ sites.…”

“…In both pathways, the butadiene is subsequently hydrogenated to butene isomers and finally to butane [25] . As reported by Van Parijs, Hosten and Froment, [25] HYD and HDS occurs on different active sites, the first one on σ sites, whereas the latter on τ sites. According to the studies of Satterfield and Roberts [26] the thiophene desulfurization occurs through butadiene isomers.…”

Possible precursors and products of deep hydrodesulfurization of gasoline and distillate fuels III. The thermodynamic properties of 1,2,3,4-tetrahydrodibenzothiophene

“…The group-contribution method values, T c ¼ 857 K, p c ¼ 3450 kPa, and q c ¼ 349 kg Á m À3 , differ substantially with those derived in this research T c ¼ 825 K, p c ¼ 2680 kPa, and q c ¼ 328 kg Á m À3 . Figure 2 shows the major route for the hydrodesulfurization of dibenzothiophene [7][8][9][10][72][73][74]. A previous NIPER/DOE Report [17] compared the thermodynamics of nitrogen and sulfur removal in heavy oil upgrading, but was restricted to acyclic and monocyclic compounds.…”