Preparation of Novel and Highly Stable Py/MOF and Its Adsorptive Desulfurization Performance

A highly active and stable MOF-199-supported ionic liquid [Hnmp]­[H2PO4] (IL-NP) adsorbent (Py/MOF) was successfully synthesized and characterized via XRD, SEM and TEM, TG-DTG, FT-IR, BET, and XPS technologies. The effects of different sulfides and interfering components present in model oils on the adsorptive desulfurization (ADS) performance of Py/MOF were studied. The results show that the regular octahedron crystalline structure of MOF-199 was well preserved and IL-NP fixed on the surface of MOF-199 presented like a flower after grafting ionic liquid IL-NP. The Py/MOF showed highly ordered canals, which are larger than those of MOF-199. Upon introducing IL-NP to MOF-199, the ADS activities were improved, which can be attributed to the improved intimate contact between sulfur compounds and adsorbent, the additional adsorption acidic sites for slightly basic sulfur compounds, and the increased pore size with mesoporous pores appearing. The ADS activity of Py/MOF adsorbing different sulfides was in the order of DBT > BT > 3-MTP > TP > 2,5-DMTP, and the effect of interfering component on ADS performance of Py/MOF was in the order of cyclohexene > toluene > water > ethanol. After 4 times of regeneration, the DBT removal onto Py/MOF was still at 93.8%, which decreased by 4.9% as compared to that of the fresh adsorbent.