Collect. Czech. Chem. Commun. 1980, 45, 2532-2540

The effect of hydrogen pressure on desulphurization of diethyl sulphide and thiophene on a cobalt-molybdenum catalyst

Jindřiška Maternová and Miroslav Zdražil

Institute of Chemical Process Fundamentals, Czechoslovak Academy of Sciences, 165 02 Prague 6-Suchdol


Integral kinetic data for the reaction of diethyl sulphide, thiophene and their mixture have been obtained on a Co-Mo-Al2O3 catalyst at 573 K and hydrogen pressures up to 2 MPa. In the reaction of single compounds at low hydrogen pressures and in the reaction of their mixture over the whole range of hydrogen pressures, diethyl sulphide reacts at a faster rate, compared to thiophene. However, both compounds exhibit the same reactivity in their single reactions carried out at hydrogen pressures around 2 MPa. Kinetic behaviour of intermediate products of the above reactions (ethylthiol and tetrahydrothiophene) have been examined. The results obtained lead to the following conclusions: thiophene ring is hydrogenated in the first step of the reaction, the cleavage of the C-S bond in saturated sulphides is an elimination reaction taking place without direct participation of hydrogen, and hydrodesulphurization catalysts are therefore bifunctional.