Effects of tungsten, molybdenum and nickel content chang on physicochemical properties and hydrogenation activity of bulk catalysts

Bulk catalysts with different active metal atomic ratios were prepared. The effects of changing active metal tungsten, molybdenum and nickel contents on the physicochemical properties and activity of bulk catalysts were investigated using various characterization instruments, such as BET, XRD, SEM, TEM, determination of strength, packing density and laboratory scale hydrogenation apparatus. The results show that pore volume, specific surface area, pore size and the activity of ultra-deep hydrodesulfurization were all increased with the decrease of (W+Mo)/Ni ratio, while W/Mo atomic ratio remained constant. The reaction temperature reduced by 8℃ when sulfur content of refined oil is less than 10 μg/g. And the pore volume, specific surface area, pore size and ultra-deep hydrodesulfurization activity did not change obviously with increase of the W/Mo atomic ratio in the range of 0.28-1.85 while the (W+Mo)/Ni atomic ratio was kept unchanged.