Nickel-molybdenum aluminosilicate catalysts for hydrocracking of vacuum gasoil to improve the yield of diesel fraction

Industrially available reagents and preparation methods were used for synthesis of nickel-molybdenum catalysts for hydrocracking based on amorphous aluminosilicates (AAS) with the Si/Al ratio from 0,3 to 1,5. Acidic properties of the AAS surface were determined from CO adsorption using IR spectroscopic technique. The Si/Al ratio was shown to influence the concentration and strength of Broensted and Lewis acid sites in AAS. The studies using low temperature nitrogen adsorption and TEM revealed that the Si/Al ratio affects the catalyst textural parameters but practically not the dispersion of the active sulfide component. The catalysts for hydrocracking of vacuum gasoil were tested using a laboratory high-pressure flow installation under conditions typical of the industrial process. The highest yield of the diesel fraction (more than 60 wt.% at 400 °C) was observed with the catalyst based on AAS with Si/Al = 0,9 which bore the strongest Broensted acid sites. A considerably lower yield of the diesel fraction obtained at Si/Al = 0,3 and 1,5 was accounted for by lower concentrations and strengths of the acid sites in these catalysts, as well as by their lower specific surface areas. The data obtained allow the NiMo catalyst based on AAS with Si/Al ≈ 0,9 to be recommended for the refineries to produce mainly lowsulfur high-cetane diesel fuel.

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