Synergistic effects of MOF-76 on layered double hydroxides with superior activity for extractive catalytic oxidative desulfurization
Metal-organic frameworks(MOFs) combination with layered hydroxides(LDHs) has been greatly limited by the agglomeration of pure MOF and the height of LDH gallery, So there are few reports on the combination of MOF and LDHs. In this work, for the first time, the combination of MOF-76 with layered double hydroxides (MOF-76@LDH) under room temperature and pressure conditions without the necessity of protecting with nitrogen used for desulfurization. The structural analysis of the heterogeneous catalyst were characterized using FT-IR, XRD, TG, BET, SEM, EDX, XPS, Fluorescence and ICP-AES. The as-prepared catalyst exhibited superior activity in deep desulfurization of DBT(dibenzothiophene), BT(benzothiophene) and 4,6-DMDBT(4,6-dimethyldibenzothiophene). The above sulfides could be completely converted into their corresponding sulfones and sulfoxides at 60°C in 25, 40 and 55minutes, respectively. 49wt.% MOF-76@LDH ability to exhibits high desulfurization capacity (100%), much higher than LDH (16.3%), MOF-76 (48%) and MOF76+LDH(50.3%). Because MOF-76@LDH a special one-dimensional channel pair on the surface of the material can efficiently promote H2O2 degrade into hydroxyl radicals(•OH) and further improve the desulfurization effect. The catalyst can be easy to recycled and reused at least 5 times and the catalytic effect is not significantly reduced. This provides a completely new route for the synthesis of MOF-LDH advanced functional materials.