TI Synthesis of metal organic framework (MOF-5) with high selectivity for CO<sub>2</sub>/N<sub>2</sub> separation in flue gas by maximum water concentration approach
AB Water plays a crucial role in the synthesis mechanism of metal organic framework-5 (MOF-5). Synthesized MOF-5 with good phase structure and large specific surface area is largely determined by an important synthesis factor: the total water concentration of the initial synthesis solution (C (tw) ). An understanding of the effects of different and high C (tw) on the synthesis of MOF-5 and the investigation of the maximum C (tw) suitable for the synthesis of MOF-5 are important to guide the synthesis of MOF-5. Through the research of the maximum C (tw) , a favorable synthetic approach was established which could realize the synthesis of MOF-5 with fine performance on CO2 adsorption and separation. The research results show that the maximum C (tw) could be as high as 1,440mmol/L, and synthesized MOF-5 still has a good phase structure and a large specific surface area of 2,136m(2)/g (BET). Synthesized MOF-5 by the maximum C (tw) exhibits a high CO2 adsorption capacity of 2.5mmol/g and a low N-2 adsorption capacity of 0.2mmol/g at 298 K and 100 kPa. More importantly, synthesized MOF-5 by the maximum C (tw) exhibits a high selectivity for CO2/N-2 of 18-22 at 298 K and 20-130 kPa in simulated flue gas.
