改性γ-Al_2O_3的制备及其对苯并噻吩吸附的性能  

Preparation of Modified γ-Al_2O_3 and Its Performance of Benzothiophene Adsorption Removal

作　　者：李文秀[1] 张华[1] 范俊刚[1] 李志超[1] 张志刚[1] 

机构地区：[1]沈阳化工大学辽宁省化工分离技术重点实验室,辽宁沈阳110142

出　　处：《石油学报（石油加工）》2014年第6期984-989,共6页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：辽宁省自然科学基金项目(2013020080);辽宁省教育厅科学研究项目(L2013162)资助

摘　　要：采用过量浸渍法制备负载不同金属组分的改性γ-Al2O3吸附剂,并对其进行XRD、扫描电子显微镜和N2物理吸附-脱附表征。在常温常压下,利用小型固定床实验考察该系列吸附剂对由苯并噻吩溶于正庚烷中配制而成的模拟汽油的吸附脱硫性能,着重考察了负载金属种类(Ag、Ce、Cu、Fe、Ni)对吸附剂吸附脱硫性能的影响,以及硝酸银溶液浓度、焙烧温度和焙烧时间对Ag-γ-Al2O3吸附剂吸附脱硫性能的影响及其再生性能。结果表明,在5种不同金属改性γ-Al2O3吸附剂中,Ag-γ-Al2O3吸附剂的吸附脱硫性能最好;在最佳制备条件,即在硝酸银溶液浓度0.2mol/L、焙烧温度450℃、焙烧时间5.5h下制备的Ag-γ-Al2O3对模拟汽油的处理量可达46mL/g。Ag-γ-Al2O3再生吸附剂对模拟汽油的处理量为39mL/g,达到新鲜吸附剂的84.8%。Modifiedγ-Al2O3 adsorbents loaded with different metal components were prepared by excessive impregnation method,and characterized by XRD,SEM and N2 adsorption-desorption measurements.The adsorption desulfurization performance of modifiedγ-Al2O3 adsorbents was investigated in a fixed bed reactor with the mixture of benzothiophene and n-heptane as model gasoline at room temperature and atmospheric pressure,in which the effect of loaded metal species（Ag、 Ce、 Cu、 Fe、 Ni） on adsorption desulfurization efficiency was investigated,and furthermore,the effects of silver nitrate solution concentration,calcination temperature and calcination time on adsorptive desulfurization performance of Ag-γ-Al2O3 adsorbent prepared with a solution of silver nitrate were investigated.The results showed that Ag-γ-Al2O3 adsorbent was the best one for benzothiophene removal among the five modifiedγ-Al2O3 adsorbents loading Ag,Ce,Cu,Fe and Ni,respectively.Under the optimal preparation conditions of AgNO3 concentration 0.2mol/L,calcination temperature 450℃and time 5.5h,the adsorbent capacity of the prepared Ag-γ-Al2O3 for model gasoline reached 46 mL/g.The processing capacity of the regenerated Ag-γ-Al2O3 adsorbent on the model gasoline was 39mL/g,which was 84.8% of the fresh adsorbent.

关 键 词：吸附脱硫 Γ-氧化铝 苯并噻吩 模拟汽油 

分 类 号：TQ424.27[化学工程]