COO-MOO3-AL2O3 CATALYST .3. CATALYTIC PROPERTIES

With the help of a microreactor pulse technique under chromatographic conditions, the catalytic properties of the hydrodesulfurization catalyst cobalt molybdate on alumina were investigated. Attention was given to the effect of poisoning substances. The catalyst is fully activated by reduction. Sulfidation of the catalyst does not increase its activity. A model is proposed in which thiophene is adsorbed on an anion vacancy and becomes attached with its sulfur atom to a molybdenum atom. The CS bonds are broken by a transfer of hydrogen atoms from adjacent hydroxyl (or SH) groups. Above 220-280 °C butene is hydrogenated from OH groups, but below 220-280 °C it reacts directly with a H2 molecule from the gas phase. The role of the cobalt in the catalyst remains obscure from these experiments. © 1969.