Kinetics of dehydrogenation and dehydration of alcohols and dehydrogenation of hydrocarbons on WS2 and MoS2 catalysts

Abstract

1. It was shown that on the sulfide catalysts WS2 and MoS2 dehydrogenation and dehydration of alcohols and dehydrogenation of hydrocarbons take place, accompanied by partial cracking. The activation energies of these reactions were determined. 2. In respect to dehydrogenation of isopropyl alcohol MoS2 was much more active than WS2; in addition only dehydration took place on WS2, whereas dehydrogenation and dehydration occurred on MoS2. 3. The relative adsorption coefficients of the reaction products on the WS2 catalysts were determined for the dehydration of isopropyl alcohol, revealing that the adsorption coefficients of propylene and water were the same on different samples of WS2 and were not dependent on temperature. 4. The bond energies of the atoms C, H and O with the catalyst surface of WS2 and MoS2 were calculated by the three reactions kinetic method and by the adsorption-kinetic method.