利用蒸氨法制备了Cu/SiO₂催化剂，同时以Cu/SiO₂为前基体，采用等体积浸渍法分别负载Fe、Mn、Cr 3种活性金属，考察了Cu/SiO₂、Fe-Cu/SiO₂、Mn-Cu/SiO₂、Cr-Cu/SiO₂催化剂对大庆常顶油品脱砷性能的影响。利用BET、FT-IR、TEM、XRD、XRF、H₂-TPR等方法对催化剂进行了表征。结果表明，本体型Cu/SiO₂催化剂及双金属负载型Fe-Cu/SiO₂、Mn-Cu/SiO₂、Cr-Cu/SiO₂催化剂的脱砷效果均优于工业剂。相比工业剂，Cu/SiO₂拥有更为优异的织构性质及分散性能，而对于双金属脱砷剂而言，二次负载的活性金属Fe、Mn、Cr均促进了Cu物种在Cu/SiO₂体相的进一步分散，同时增强了催化剂体系的氧化性能，其中氧化性最强的Cr-Cu/SiO₂表现出了最佳的脱砷效果，脱砷率为99.19%。

Cu/SiO₂ catalyst is prepared via ammonia evaporation method.Using Cu/SiO₂ as precursor,Fe,Mn and Cr as active metals are respectively loaded by equal volume impregnation method.The influences of Cu/SiO₂,Fe-Cu/SiO₂,Mn-Cu/SiO₂ and Cr-Cu/SiO₂ catalysts on the arsenic removal efficiency of Daqing atmospheric distillation tower top oil are investigated.These catalysts are also characterized by BET,FT-IR,TEM,XRD,XRF and H₂-TPR.The results indicate that the arsenic removal efficiency by Cu/SiO₂,Fe-Cu/SiO₂,Mn-Cu/SiO₂ and Cr-Cu/SiO₂ catalysts are all better than the current commercial catalysts.Compared with commercial catalysts,Cu/SiO₂ possesses the better texture and dispersion properties,which can improve its arsenic removal and adsorption performance.As for bimetallic arsenic removal catalysts,the secondary loaded active metals such as Fe,Mn and Cr all can promote the further dispersion of copper species in the Cu/SiO₂ catalyst,thereby improving the performance of arsenic removal.In addition,the redox performance of Cu/SiO₂ system is enhanced by the secondary loading metal,which has an effect on the arsenic removal performance.Among them,Cr-Cu/SiO₂ has the strongest reducing ability and exhibits the best arsenic removal effect,with a 99.19% of arsenic removal rate.

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