Study the Effect of operational Parameters on the Adsorption Characteristics of Synthesized Microporous MOF-5 for Methane Adsorption

In this study, the optimization of MOF-5 production from Zn(NO3)2.4H2O as metal and H2BDC as ligandusing hydrothermally method for methane adsorption is investigated. The operational parameters studied were pH, dryingtemperature and solvent type. The effect of these parameters towards breakthrough adsorption capacity was studied usingstatistical analysis with Design Expert Software. Based on these method 17 samples were identified and prepared withspecific condition. After the superior sample selection in order to increase the absorption properties and evacuation ofthe adsorbent pores, activation treatment including preservation in initial solvent, solvent exchange and drying underevacuated condition was performed. The final selected MOF was characterized by scanning electron microscopy (SEM),thermal gravimetric analysis (TGA) and pore size distribution (PSD). The corresponding pore size of sample which wasdetermined by nitrogen adsorption at 77 K was equal to 31.27Ǻ. Methane adsorption equilibrium was measured in avolumetric adsorption unit and methane adsorption capacity of this sample was 18.15 mmol/g at temperature of 298Kand pressure of 36 bar that shows a significant increase in methane storage quantity compared to other methaneabsorbents.

کلیدواژه ها:

Metal organic framework ، Methane adsorption ، Activation ، Expriment design