Deep desulfurization of heavy atmospheric gas oil with Cosingle bondMosingle bondAl catalysts effect of sulfur adsorption Original Research Article

The transient sulfur adsorption and reaction on partially sulfided and oxyregenerated Cosingle bondMosingle bondAl catalysts in the hydrodesulfurization of heavy atmospheric gas oil (HAGO) was studied in batch and trickle-bed reactors. All experiments were carried out at 360°C and 5.5 MPa. The contribution of sulfur adsorption to sulfur removal was significant in cases of 1000–1800 ppm sulfur in the feedstock. The sulfur level in hydrotreated HAGO was lowered by 50–350 ppm due to sulfur adsorption on the catalyst for periods of 20–50 h. The principle of regeneration and adsorption in a trickle bed has been proven. A model that describes the transient adsorption and reaction is proposed.