eng Science and Education Publishing Journal of Materials Physics and Chemistry 2333-4444 2022-04-12 10 1 17 22 10.12691/jmpc-10-1-3 JMPC20221013 article Fucun Wang fucunwang@yeah.net 1 Zhongyang Zhang 2 Baodong Jin 2 Baojing Cui 2 Baojun Jia 2 Famin Sun 2 Tiezhen Zhang 2 Jinling Zhu 2 Daqing Petrochemical Research Center of PetroChina, Daqing, Heilongjiang, 163714, China PetroChina Fushun Petrochemical Company, Fushun Liaoning 113001, China The modifications of NaY zeolites with different SiO2/Al2O3 ratio were carried out, the results revealed that modified USY zeolites showed some mesopores, as the SiO2/Al2O3 ratio of USY increased, the weak acidity strength of USY had little change, medium and strong acidity strength of USY decreased, the weak acidity and medium-strong concentration decreased.The selective ring opening evaluation of tetralin revealed that hydro-upgrading catalyst with different USY zeolites had different tetralin conversion, different yield and selectivity of ROP. The catalyst prepared with USY zeolite modified from NaY with the SiO2/Al2O3 ratio of 5.7 showed best hydro-upgrading performance, which had higher tetralin conversion, higher yield and selectivity of ROP. Acidity and Si/Al ratio of USY zeolites both were important factors affecting catalyst performance. http://pubs.sciepub.com/jmpc/10/1/3/jmpc-10-1-3.pdf NaY type zeolite SiO₂/Al₂O₃ ratio USY zeolite catalyst performance