Abstract: CoMoP catalysts containing zeolites were prepared by saturated impregnation using hierarchical Y zeolites as acidic components. The zeolite samples were characterized by X-ray diffraction (XRD), N2 adsorption-desorption, high-resolution transmission electron microscopy (HRTEM) and pyridine-FTIR techniques. The HDS performance of CoMoP catalysts containing hierarchical Y zeolites was evaluated in a high pressure micro-reactor using 4, 6-dimethyldibenzothiophene as a model compound. The results showed that the high external surface area and mesoporous volume of hierarchical Y zeolites contributed to higher accessibility of Br?nsted acid sites. Compared with the reference CoMoP/Al2O3-Y catalyst, the catalysts containing hierarchical Y zeolites with high Bronsted acidity exhibited acid-catalyzed reaction activity and higher total HDS activity. The transalkylation activity was increased with the strong Br?nsted acidity of zeolite.

Key words: hierarchical zeolite, CoMoP catalyst, 4,6-dimethyldibenzothiophene, hydrodesulfurization