Method for preparing hexadecahydropyrene

A method for preparing hexadecahydropyrene, comprising:

• hydrogenating a hydrocarbon oil raw material that contains pyrene compounds in the presence of a first hydrogenation catalyst in a first reactor;
• hydrogenating an effluent from the first reactor in the presence of a second hydrogenation catalyst in a second reactor;
• separating an effluent from the second reactor to obtain a product stream comprising hexadecahydropyrene;
• cooling the product stream;
• and
• separating hexadecahydropyrene from the cooled product stream,
• wherein the pyrene compounds are selected from at least one of pyrene and unsaturated hydrogenation products thereof,
• wherein each of the first hydrogenation catalyst and the second hydrogenation catalyst comprises a carrier and an active metal component loaded on the carrier,
• wherein the active metal component is Pt, Pd, or Pt and Pd, the carrier comprises a small crystal size Y zeolite, alumina, and amorphous silica-alumina, wherein the small crystal size Y zeolite has an average grain diameter of 200-700 nm, a molar ratio of SiO2/Al2O3 of 40-120, a relative crystallinity of ≥95%, a specific surface area of 900-1,200 m2/g, and a pore volume of secondary pores having 1.7-10 nm in diameter that accounts for 50% or more of a total pore volume, and
• wherein a weight percentage of the active metal component in the first hydrogenation catalyst (x1) is lower than a weight percentage of the active metal component in the second hydrogenation catalyst (x2), and a weight percentage of the small crystal size Y zeolite in the first hydrogenation catalyst (y1) is higher than a weight percentage of the small crystal size Y zeolite in the second hydrogenation catalyst (y2), wherein x1 and y1 are based on a total weight of the first hydrogenation catalyst, and x2 and y2 are based on a total weight of the second hydrogenation catalyst.