Hydrotreating Of Diesel Fuel Over Ex Situ Presulfided Niw And Nimow Catalysts.

Two commercial hydrogenation catalysts NiW/Al2O3 and NiMoW/Al2O3 were presulfided with ex-situ and in-situ method of presulfurization, respectively, and the activities of the catalysts were studied by the hydrotreating of diesel fuel. The vulcanization agent with given component could effectively sulfurize NiW/Al2O3 and NiMoW/Al2O3. The time for the treatment of the ex situ presulfided catalyst was half that for the in situ presulfurization, which means energy consuming can be reduced greatly during the sulfurization process. The HDN and HDS activities of the ex situ presulfided catalyst were the same as or even better than in situ presulfided catalyst.