Preparation Of Py/MOF Adsorbent And Study On Its Desulfurization Performance

Py/MOF adsorbent was successfully synthesized via fixing ionic liquid[Hnmp][H₂PO₄]onto MOF-199 and was ferequently characterized via XRD,BET,SEM&TEM,FT-IR,and TG,et al equipments.With thiophene（TP）as the model sulfide,the factors,for instance,pretratement,loading metho,temeperature,time and ionic liquid content,of the preparation have been tested and the optimal conditions have been curtained via orthogonal experient.The desulfurization capability of Py/MOF adsorbing different sulfides and the effects of interfering component presenting on desulfurization performance of Py/MOF were tested.Operating conditions,regenerability and kinetics of Py/MOF were explored as well.The results show that:（1）The optimal conditions of preparing Py/MOF adsorbent is after pretreating MOF-199 with soxhlet extracted thoroughly with dichloromethane and then dried in a vacuum oven,with solvothermal method,loading 7%ionic liquid onto MOF-199 for 8 h under 323 K.The influence of each factor on the desulfurization performance of adsorbent is in order as:temperature>time>ionic liquid content.（2）The structure of Py/MOFwas maintained the regular octahedron of MOF-199 perfectly without collapse or change.Ionic liquid[Hnmp][H₂PO₄]was fixed on the surface like a flower.After the introduction of[Hnmp][H₂PO₄],some mesopores were formed and the thermal stability of MOF-199 was impreoved.（3）The desulfurization capability of Py/MOF adsorbing different sulfides and the effects of interfering component presenting on desulfurization performance of Py/MOF were in order as:DBT>BT>3-TP>TP>2,5-DTP and cyclohexene>tolune>water>ethanol.（4）The deslufirization of DBT can reach 98.6%while employing 0.2 g Py/MOF to adsorbe 10 m L model gasoline under 30℃for 1 h,which is the optimal operating condition of adsorbing DBT.In contrast to that,the deslufirization of TP can reach 96.7%while employing 0.2 g Py/MOF to adsorbe 10 mL model gasoline under 70℃for 1 h.（5）After 4 times of regeneration,the desulfurization rate of Py/MOF to DBT can still reach 92.8%,and that of TP can still reach86.9%indicating Py/MOF has good regeneration performance.（6）The kinetics can be well represented by the pseudo-second-order model and Langmuir model.