Eo. Orozco et M. Vrinat, KINETICS OF DIBENZOTHIOPHENE HYDRODESULFURIZATION OVER MOS2 SUPPORTEDCATALYSTS - MODELIZATION OF THE H2S PARTIAL-PRESSURE EFFECT, Applied catalysis. A, General, 170(2), 1998, pp. 195-206
The influence of H2S partial pressure over the catalytic activity of M
oS2, supported on three different oxides: Al2O3, TiO2 and ZrO2, was st
udied in the hydrodesulfurization of dibenzothiophene (DBT). A complex
inhibiting effect is observed and two orders of reaction relative to
H2S were determined: -1/2 and 0, as a function of H2S partial pressure
. The experimental results are in good agreement with the kinetic mode
ls whereby the DBT transformation takes place through a dihydrogenated
intermediate (DH-DBT). The associated mechanism considers that the he
terolytic dissociative adsorption of H-2 and H2S occurs over an unsatu
rated Mo ion and over a stable sulfur ion. (C) 1998 Elsevier Science B
.V. All rights reserved.