银、铈改性MIL-101脱硫吸附剂的制备与优化

Preparation and process optimization of Ag-Ce modified MIL-101 desulfurization adsorbent

利用银、铈双金属改性金属有机骨架MIL-101制备Ag-Ce/MIL-101吸附剂,并对Ag-Ce/MIL-101进行XRD、SEM、BET和ICP表征。考察了制备条件对Ag-Ce/MIL-101吸附苯并噻吩(BT)性能的影响。结果表明,Ag-Ce/MIL-101未破坏MIL-101的原始晶格结构,比表面积和孔容有所降低。适宜Ag-Ce/MIL-101的制备条件为:负载顺序为先银后铈,金属负载浓度均为40 mmol/L,金属溶液用量均为2 mL,负载温度为150℃,负载时间为9 h。在吸附剂质量为0.1 g、模拟油用量为20 mL、吸附温度为30℃、吸附时间为12 h时,Ag-Ce/MIL-101对BT的吸附量达到33.9 mg/g。

Ag-Ce/MIL-101 adsorbent is successfully prepared via loading Ag and Ce onto MIL-101(Cr),and characterized via XRD,SEM,BET and ICP methods.The effect of preparation conditions on the adsorption of benzothiophene(BT)by Ag-Ce/MIL-101 is evaluated.It is shown that the regular structure of MIL-101 remains unchanged after the loading of metals.Compared with MIL-101,the specific surface area and pore volume of Ag-Ce/MIL-101 drop to a certain extent.The optimal preparation conditions suitable for Ag-Ce/MIL-101 adsorbent are as follows:Ag is loaded before Ce,the loading concentration of both silver ion and cerium ion is 40 mmol·L^(-1),the dosages of AgNOsolution and Ce(NO)solution are both 2 mL,the loading temperature is 150℃,and the loading time is 9 h.The adsorption effect of Ag-Ce/MIL-101 on benzothiophene reaches 33.9 mg·gwhen the dosage of adsorbent is 0.1 g,the dosage of model oil is 20 mL,and the adsorption has been performed at 30℃for 12 h.