Hydrodesulfurization of sulfur heterocyclic compounds: kinetics of dibenzothiophene. [Hydrodesulfurization of dibenzothiophene]

Journal Article · Sun Feb 01 04:00:00 EST 1981 · J. Catal.; (United States)

OSTI ID:6395247

Singhal, G H; Espino, R L; Sobel, J E; Huff, Jr, G A

A kinetic analysis of the hydrodesulfurization (HDS) of dibenzothiophene (DBT), a representative model of the condensed sulfur heterocyclics found in heavy petroleum feeds, has been carried out. Kinetic data were generated over standard Co-Mo/..gamma..-Al/sub 2/O/sub 3/ catalyst at temperatures of 285 to 350/sup 0/C by varying hydrogen partial pressure, liquid hourly space velocity, and DBT feed concentration. From the data, models obeying Langmuir-Hinshelwood kinetics were developed to account for the rate of disappearance of DBT as well as for the selectivity of product formation. The models imply that two types of sites on the catalyst surface are involved in the HDS reaction, on one of which dibenzothiophene and the reaction products biphenyl, cyclohexylbenzene, and hydrogen sulfide competitively adsorb and a second site on which hydrogen adsorbs. The kinetic models developed to account for the appearance of the products indicate that product formation proceeds predominantly by a parallel path mechanism. However, there is a small contribution to the cyclohexylbenzene production from the sequential hydrogenation of biphenyl which becomes significant at higher temperatures.

• Research Organization: Exxon Research and Engineering Co., Linden, NJ
• OSTI ID: 6395247
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 67:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AROMATICS
BIPHENYL
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COBALT
DESULFURIZATION
ELEMENTS
HETEROCYCLIC COMPOUNDS
HIGH TEMPERATURE
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
HYDROGENATION
KINETICS
METALS
MOLYBDENUM
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
REFRACTORY METALS
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENTS