COKE FORMATION ON HYDRODESULPHURIZATION CATALYSTS

The extent of coke formation was measured on a number of different hydrodesulphurization catalysts, primarily as a function of the catalyst chemical composition. Variations in the concentration of MoD3 on the alumina, the type of catalyst promoter, the promoter/MoO3 ratio, the presulphiding material and the reaction temperature were made. Increases in the reaction rate caused by either changes in the catalyst composition or by moderate changes in the reaction temperature were compared to the catalyst coke content. It was suggested that two types of coke were present on the catalyst, a reactive coke which is subsequently converted to reaction products and an unreactive coke which blocks catalytic sites. © 1979.