利用共沉淀法制备载体Al₂O₃-SiO₂，采用等体积浸渍法考察了Cu/Al₂O₃-SiO₂催化剂对大庆常顶油品30~80、80~135、135℃以上3种馏分下不同砷形式的脱除性能。BET、XRD、SEM、FT-IR表征及评价分析结果表明，以活性组分Cu²⁺担载介孔结构较为宽泛的Al₂O₃-SiO₂对大于135℃馏分中主要以三乙砷、苯基砷形式存在的砷化物表现出最佳的吸附脱除效果。为进一步对其选择性吸附进行分析，采用密度泛函理论B3LYP方法，研究了金属离子Cu²⁺对不同有机砷形态的络合吸附性能，计算结果得出，当R-A_S与CuO发生吸附作用时，随着R-基中碳原子数目的增加，A_S-Cu键长缩短，砷化物与铜物种的相互作用能更小，形成的配合物更加稳定。

Al₂O₃-SiO₂ carrier is prepared by the co-precipitation method.The equal volume impregnation method is used to evaluate the arsenic removal performance of Cu/Al₂O₃-SiO₂ catalyst for different arsenic forms in top gasoline of atmospheric tower refining Daqing crude oil in fractionating sections at 30-80℃,80-135℃and >135℃.The characterization results through BET,XRD,SEM,FT-IR and experimental results show that the active component Cu²⁺ loaded Al₂O₃-SiO₂ with broader mesoporous exhibits the best removal effect on the fractions higher than 135℃ which contains mainly triethylarsenic and phenylarsenic.In order to further analyze catalyst's selective adsorption,the density functional theory B3LYP method is used to study the complex adsorption properties of metal ions Cu²⁺ to different organic arsenic forms.The results show that the interaction energy between R-As and CuO becomes lower and the formed complexes are therefore getting more stable when the adsorption occurs between organic arsenic compounds and copper species with the increase of the number of carbon atoms in R-radical and As-Cu bond length decreases.

孟祥祺(1986-),男,硕士研究生,研究方向为油品脱砷剂的制备与表征,mengxiangqi1234@163.com