Controlled Synthesis of Mg-MOF-74 and Its CO2 Adsorption in Flue Gas

Abstract

Yellow nanorod Mg-MOF-74 was obtained through a solvothermal synthesis method. The XRD, N2 adsorption–desorption isotherms, SEM, and TGA results suggest that the particle size of Mg-MOF-74 reaches 400 nm after the introduction of sodium acetate in the precursor of Mg-MOF-74. Furthermore, the morphology of Mg-MOF-74 changed from cauliflower- to rod-shaped particles. At the same time, the BET specific surface area and pore volume of Mg-MOF-74 also increased a lot. Then, the CO2 dynamic adsorption capacity of Mg-MOF-74 was measured with a self-made fixed bed at 30 °C and a 0.1 bar CO2 partial pressure. The results show that the CO2 adsorption capacity of Mg-MOF-74-N2 reaches 3.67 mmol/g, and its CO2 adsorption capacity remains unchanged after 10 CO2 adsorption–desorption cycles.