Catalytic Performance of Modified HZSM-5/Al2O3 Catalysts for Nonhydrodewaxing

摘要

The HZSM-5/Al2O3 molecular sieve catalyst was modified by phosphoric acid, tetraeth-oxysilane, tetrabutyl titanate, and boric acid, respectively. Properties of modified catalysts are characterized. The results show that the specific surface area declines and the acid density increases after modification of the catalysts, and the strong acid strength of Si/HZSM-5/Al2O3 catalyst enhanced. Modified catalysts performances are evaluated on fixed bed reactor using hydrocracking tail oil from a refinery as raw material. Results show that the Si/HZSM-5/Al2O3 catalyst has better catalytic dewaxing effect and stability than the other modified catalysts.