Hydrocracking of vacuum gas oil over three-layer catalyst stacks, consisting of supported NiMo and NiW sulfide catalysts

A new method of hydrocracking of vacuum gas oil was suggested. The method consists in using three-layer stacks of catalysts in which the top layer is a NiMo/Al2O3 catalyst, the middle layer is NiM/ААS-Al2O3 and the lowest layer is NiM/Y-Al2O3 (where M is molybdenum or tungsten, ААS-Al2O3 is a support containing 70 % of amorphous aluminosilicate (AAS) and 30 % of aluminum oxide, and Y-Al2O3 is a support containing 30 % of zeolite Y and 70 % of alumina). The acidic properties of the catalysts were studied by IR spectroscopy of adsorbed CO. The morphology of sulfide particles on the catalyst surface was studied by transmission electron microscopy. Textural characteristics of the supports and catalysts were studied by nitrogen porosimetry. The stacks containing catalysts NiMo and NiW in various combinations were tested in hydrocracking of vacuum gas oil. It was shown that a replacement of NiMo/ААS-Al2O3 onto NiW/AAS-Al2O3 in stacks containing only NiMo catalysts leads to a significant increase in the yield of the diesel fraction.

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