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Abstract

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.