XRD,BET,NH3-TPD,H2-TPR,CO-IR,Raman and other characterization methods were used to investigate in detail the effects of hydrothermal treatment temperature and additive modification on the properties of hydrotreating catalysts.The effects of hydrothermal treatment temperature and additive modification on the hydrodesulfurization and denitrification activity of hydrotreating catalysts were evaluated using catalytic diesel as raw material.The results indicated that hydrothermal treatment based on additive modification could effectively improve the presence of active metals on the catalyst surface,making it easier to form octahedral Mo species on the catalyst surface.The evaluation results indicated that the pore structure of the catalyst after hydrothermal treatment was smoother,and its hydrodesulfurization and denitrification activities were significantly improved;The HDS activity of SRC-2 and SRC-3 significantly increased,at around 93%and 94%,respectively,which increased the desulfurization rate by 3～4 percentage points compared to SRC-1.Among the products of SRC-5,the lowest total aromatic mass fraction was 69.2%,and the highest total saturated hydrocarbon mass fraction was 30.8%.Compared with the raw material and the hydrogenation product of SRC-1,the total saturated hydrocarbon mass fraction increased by 11.3 and 7.3 percentage points,respectively.
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