Heteroatom‐Modified Zeolite Y and Catalytic Performance of Their NiWS Supported Catalysts for Hydrocracking of Naphthalene

Abstract

In order to prepare hydrocracking catalyst with high catalytic performance for producing chemical raw materials, NiW supported catalysts was prepared with Ni−P co‐modified Y zeolites as the supports for the hydrocracking of naphthalene. Y zeolites were impregnated with different Ni−P contents, and the effects of Ni−P co‐modification on the physicochemical properties of Y zeolites, the properties of the active phases of the catalysts and the catalytic performance of catalysts were analyzed via a series of characterization methods. Ni−P co‐modification could effectively improve the pore properties and acid properties of Y zeolites, and made the acid density and acid strength of Y zeolites meet the requirements of selective cracking of naphthalene. Ni−P co‐modification could also effectively improve the reducibility of active metals,dispersion and stacking number of active phases of the catalysts, which greatly improved the selectivity of the target product (C6−C8) of the catalysts. Compared with NiW/HY, the yield of C6‐C8 products of NiW/2‐Ni/P−Y increased by 30.8 %. It is expected to provide a feasible strategy for the design and preparation of hydrocracking catalysts for the production of chemical raw materials in the integration of refining and chemical industry.