Abstract: FHUDS-5 and FHUDS-6 ultra-deep diesel hydrodesulfurization catalysts developed by SINOPEC Fushun Research Institute of Petroleum and Petrochemcials were applied in a new-built 3.0 Mt/a diesel hydrogenation unit of Zhenhai Petroleum Refining and Petrochemical Company. The calibration report of catalysts showed that the total sulfur content of refined diesel oil was 4.8 μg/g and the nitrogen content was lower than 0.5 μg/g. The average mass fraction of PAHs decreased by about 20 percent points, and the average cetane number increased by 4.1, indicating the high HDS, HDN and aromatic saturation activities, as well as good cetane number upgrading performance．In terms of the operation conditions in the first 15 months, the catalyst deactivation rate was 0.8 ℃ monthly, the bed pressure drop of the reactor was lower than 0.1 MPa and the highest temperature in reactor was lower than 370 ℃. The results showed that the catalyst combination of FHUDS-5 / FHUDS-6 has good stability and can meet the requirements for long operation period of the device.

Key words: diesel hydrotreating, catalyst, FHUDS-5, FHUDS-6