催化裂化重汽油临氢脱砷剂的研制及性能评价

PREPARATION AND PERFORMANCE EVALUATION OF HYDROGENATION CATALYST FOR SELECTIVE ARSENIC REMOVAL FROM FCC HEAVY GASOLINE

以大孔γ-Al_(2)O_(3)为载体,Mo-Ni为活性组元,采用等体积浸渍法制备了催化裂化重汽油临氢脱砷剂。考察了拟薄水铝石、胶溶剂、金属活性组元类型、金属原子比对临氢脱砷剂催化性能的影响,以及脱砷剂活性和长周期稳定性。结果表明:氧化铝孔径分布对脱砷剂性能影响较大,大孔径有利于提高临氢脱砷剂脱砷活性,有机酸作为胶溶剂可显著提高载体大孔比例;适宜的Ni/(Ni+Mo)原子比有利于改善金属分散性,提高催化剂的脱砷活性和脱砷选择性;临氢脱砷剂表现出较好的长周期运行稳定性,综合性能与商品临氢脱砷剂相当。

A hydrogenation catalyst for selective arsenic removal from FCC heavy gasoline was synthesized by equal volume impregnation method with macroporousγ-Al_(2)O_(3) as carrier and Mo-Ni as active component.The effects of aluminum oxide powder,sol,active metal and metal atom ratio on the catalyst activity and selectivity were studied.The results showed that the pore diameter distribution of aluminum oxide had a great influence on arsenic removal activities of the catalysts,and the large pores were good for improving arsenic removal activity.The organic acid as a sol could significantly increase the proportion of large pore in the carrier,and the appropriate Ni/(Ni+Mo)ratio was beneficial to the high arsenic removal activity and selectivity of the catalysts.The catalysts exhibited a good long-term stability and arsenic capacity,and the performance was comparable to the commercial arsenic removal catalysts.