Model hydrocracking catalysts combining NiMo sulfide and largepore zeolite: effect of the zeolite nature on the location of NiMo sulfide in relation with catalytic properties

摘要

This work describes the incorporation of Ni and Mo ions and their sulfidation intotwo large-pore zeolites, HBEA and HY. The bifunctional properties of the sulfidedcatalysts were determined in the reaction of benzene under 8 MPa hydrogenpressure with a constant supply of dimethyldisulfide. The internal sulfided NiMospecies are mostly located in the zeolite mesopores. Catalyst NiMoS/BEA was muchmore active for hydrogenation and cracking than its NiMoS/Y counterpart. This isexplained by a higher dispersion and a better sulfidation of the internal NiMo inzeolite HBEA. However, the hydrogenation capacity was not sufficient to balance theacidic function, so that excessive cracking occurred.