Abstract: RS-1000 catalyst for ultra low sulfur diesel production was applied in the 3.0 Mt/a diesel hydrogenation unit of SINOPEC Zhenhai Company along with the conventional FH-5A/FH-5 catalysts. The packing, drying and presulfiding of the series catalysts were introduced. Performance test results showed that using RS-1000/ FH-5A/FH-5 combined catalysts and a feed with a sulfur content of 1.36%, under the conditions of a LHSV of 1.97 h-1, a hydrogen to oil volume ratio of 298, a reactor inlet pressure of 5.79 MPa, a reactor inlet temperature of 336 ℃ and an average bed temperature of 360℃, the sulfur content of the treated diesel was 0.044%. The average HDS and HDN rates were 96.8% and 85.2%, respectively; the hydrogen consumption was 0.77%, the pressure drop of reactor was 0.17 MPa and radial temperature difference was 3℃, which indicated that the combined catalysts possessed excellent activity. Data of 3.5 years running further supported that the activity as well as the stability of the combined catalysts was excellent.

Key words: diesel fuel, hydrodesulfurization, catalyst, full scale, combination