摘要
以高硅铝比USY分子筛为裂化活性组分、Ni和W为加氢活性组分,采用共浸渍法制备了一系列不同USY分子筛含量的加氢裂化催化剂。使用NH3-TPD,BET,XRD,XPS,HRTEM等手段对催化剂进行表征,并以中/低温煤焦油加氢精制后柴油馏分为原料,在固定床加氢装置上考察催化剂的加氢裂化性能。结果表明:含USY分子筛的Ni-W催化剂具有较高的煤焦油加氢裂化活性,其裂化活性主要源于USY分子筛的酸性;适宜USY分子筛含量(30%)的催化剂在产品油质量收率大于95%的前提下,可使原料油的密度(20℃)由0.899 0g/cm3降至0.848 5g/cm3,多环芳烃几乎裂解完全,C/H摩尔比由7.32降至6.89,50%馏出温度由304℃降至270℃,同时可使十六烷指数由40.0升至43.5。
A series of NiW hydrocracking catalysts with different contents of USY with high silica to alumina ratio （Si/Al=42） were prepared by co-impregnation method. The catalysts were characterized by NH3-TPD, BET, XRD, XPS and HRTEM techniques. The hydrocracking performance of the catalysts was evaluated in a fixed-bed reactor using diesel fraction from the hydrotreated middle/low-temperature coal tar. The results show that the NiW catalysts containing USY zeolite have a high hydrocracking activity and the cracking activity is mainly derived from the acidity of USY zeolite. Under the preconditions of the product yield ≥95%, and the catalyst having appropriate USY zeolite content （30%）, the density of the product decreases to 0. 848 5 g/mL from original 0. 899 0 g/mL, or less from original 17.4%, the C/H mole ratio decrease to 6.89 from original 7.32, the 50%distillation temperature decrease to 270 ℃ from original 304 ℃ and the cetane index increases to 43.5 from original 40.0, and the polycyclic aromatic hydrocarbons are cracked almost completely.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2015年第5期76-81,共6页
Petroleum Processing and Petrochemicals
基金
中国科学院战略性先导科技专项课题(XDA07020200)
