Abstract: The effects of different regeneration methods on physicochemical properties of spent diesel hydrogenation catalyst and its residue hydrodesulfurization activity were investigated by conventional method. Firstly, the spent catalyst was regenerated, the pores of the catalyst were unblocked, and the aggregated active metals were redispersed, but the activity of the catalyst used in residue hydrodesulfurization was significantly lower than that of the standard catalyst. Secondly, the catalyst was modified from the perspective of pore expansion and strengthening the metal-support interaction.After the pore was expanded, the aggregated low active metals in the catalyst were removed, the pore structure of the catalyst was further optimized, and the utilization rate of active metals was improved.The residue hydrodesulfurization performance of the catalyst was significantly improved after strengthening the MSI. Finally, coupling the above two modification methods, the optimized catalyst was obtained, and the activity of the catalyst used in residue hydrodesulfurization was close to the level of the standard catalyst.

Key words: spent hydrogenation catalyst, regeneration, step application, residue hydrodesulfurization