Catalyst for moderate hydrocracking of polycyclic aromatic hydrocarbons in LCO to produce chemical raw materials: Ni in-situ modified Y zeolite-supported-NiWS

Abstract

Light cycle oil is rich in polycyclic aromatic hydrocarbons with low cetane number, and the best approach is to convert them into chemical raw materials with carbon number in the range of C6-C8. In view of the above problem, Y zeolites with different Ni contents were synthesized by in-situ synthesis strategy, and corresponding NiWS supported catalysts were prepared. Taking naphthalene as the model compound, the catalytic performance of the catalysts was evaluated. The effects of Ni in-situ modification on the physicochemical properties of Y zeolite and the active phase properties of catalyst were investigated. Ni in-situ modification effectively improved the number of medium-strong B acid sites in Y zeolite and weakened the MSI of the catalyst. Appropriate Ni content had a positive effect on the dispersion and stacking number of active phase. Owed to the increased number of medium-strong B acid sites and the properties of active phase, 2J-Ni-YCat showed the best catalytic performance in the hydrocracking of naphthalene to produce C6-C8 products. It is expected to provide reference for the transformation of polycyclic aromatic hydrocarbons into high value-added C6-C8 products in petrochemical industry.