Abstract: The carriers were prepared by beating and modeling SAPO-5, Beta, Y molecular sieves and pseudo-boehmite, respectively. The hydrodenitrogenation (HDN) catalysts were prepared by loading Ni-Mo metal components on the prepared carriers. The influence of different types of molecular sieves adding into alumina carrier on catalyst acidity, metal morphology and HDN performance were investigated. The characterization results of NH3-TPR, Py-IR, H2-TPR, HR-TEM indicated that compared with pure alumina carrier catalysts, the introduction of molecular sieve increases catalysts acidity amount and strength, modifies carrier surface property, decreasing MoS2 lamella length but increasing stacked layers number. Different types of molecular sieves have different impacts on the catalysts acidity and metal morphology. The evaluation results of HDN of coke gasoil illustrated that introducing molecular sieves into alumina carrier improves the HDN activity of catalysts; the catalysts with high hydrogenation activity have a higher selectivity to non-basic nitrogen removal, while the catalysts with high hydrogenolysis activity have a higher selectivity to basic nitrogen removal.

Key words: molecular sieve, alumina, catalyst, hydrodenitrogenation, basic nitrogen, non-basic nitrogen