Abstract
Three industrially modified Y zeolites with a hierarchical structure were characterized by XRD, N2 adsorption–desorption, SEM, TEM, 27Al-/29Si-NMR, in situ pyridine-FTIR, and NH3-TPD techniques. The industrial hydrocracking catalyst of light diesel oil was prepared by kneading and extruding the mixture of 10 wt.% industrially modified zeolite, commercial alumina, nickel nitrate, and molybdenum oxide. The small amount of hierarchical Y zeolite in the hydrocracking catalyst plays a key role, resulting in selective hydrogenation of naphthalene and further ring-opening activity. The mesoporous structure of the zeolites provided an effective interface and improved the accessibility of acid sites to bulky reactants.
Highlights
Hydrocracking of heavy oils is a very important process for petroleum conversion, in which high-molecular-weight hydrocarbons are converted to low-molecular-weight hydrocarbons [1].Most of the conventional hydrocracking catalysts are bifunctional catalysts, whose functions involve hydrogenation–dehydrogenation by metal components and acid cracking over zeolites [2].The hydrogenation–dehydrogenation processes over the metallic component realizes the conversion of aromatics to naphthenics, and the acid sites, usually afforded by the zeolite component, trigger the cracking roles of C-C bonds of naphthenes and partial lateral chains [3]
MUSY-A is a commercial product USY zeolite produced by Dalian (Fushun) Research Institute of Petroleum & Petrochemicals, industrial product USY zeolite produced by Dalian (Fushun) Research Institute of Petroleum &
The bifunctional hydrocracking catalysts were obtained by kneading the Y zeolite sample, commercial alumina, nickel nitrate, and molybdenum oxide, and later by the extruding process
Summary
The hydrogenation–dehydrogenation processes over the metallic component realizes the conversion of aromatics to naphthenics, and the acid sites, usually afforded by the zeolite component, trigger the cracking roles of C-C bonds of naphthenes and partial lateral chains [3]. Metals of Mo, Ni, W, Pd, and Pt were often reported to serve the hydrogenation–dehydrogenation purpose of the bifunction catalysts [4,5,6,7,8,9].
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