DYNAMICS OF ACTIVE-SITES TRANSFORMATION IN HDS-HDA CATALYST

Benzene hydrogenation in steady-state and unsteady-state regimes over sulfide Ni-W/gamma-Al2O3 catalyst is studied. The mechanism and dynami c model of hydrogenation and hydrogenolysis active sites transformatio n are proposed. The reactions were shown to be quasi steady-state ones with slow poisoning of both hydrogenation and hydrogenolysis active s ites by the formation of intermediate surface compounds of sulfur. The dynamic behavior was described by the proposed model with sufficient accuracy.