Direct separation of high purity ethylene(C_(2)H_(4))from an ethane(C_(2)H_(6))/ethylene mixture is a critical and challenging task owing to the very similar molecular size and physical properties of the two component...Direct separation of high purity ethylene(C_(2)H_(4))from an ethane(C_(2)H_(6))/ethylene mixture is a critical and challenging task owing to the very similar molecular size and physical properties of the two components.While some studies have attempted this separation,there is a lack of excellent porous materials with strong binding affinity for C_(2)H_(6)-selective adsorption via an energy-efficient adsorptive separation process.Herein,we report a titanium metal-organic framework with strong binding affinity and excellent stability for the highly efficient removal of C_(2)H_(6) from C_(2)H_(6)/C_(2)H_(4) mixtures.Single component adsorption isotherms demonstrated a larger amount of adsorbed ethane(1.16 mmol·g^(-1) under 1 kPa)and high C_(2)H_(6)/C_(2)H_(4) selectivity(2.7)for equimolar C_(2)H_(6)/C_(2)H_(4) mixtures,especially in the low-pressure range,which is further confirmed by the results of grand canonical Monte Carlo simulations for C_(2)H_(6) adsorption in this framework.The experimental breakthrough curves showed that C_(2)H_(4) with a high purity was collected directly from both 1:9 and 1:15 C_(2)H_(6)/C_(2)H_(4)(volume ratio)mixtures at 298 K and 100 kPa.Moreover,the unchanged adsorption and separation performance after cycling experiments confirmed the promising applicability of this material in future.展开更多
基金the financial support from the National Natural Science Foundation of China (21922810, 21908153, 21908155)program of Innovative Talents of Higher Education Institutions of Shanxithe supported by Cultivate Scientific Research Excellence Programs of Higher Education Institutions in Shanxi (CSREP)
文摘Direct separation of high purity ethylene(C_(2)H_(4))from an ethane(C_(2)H_(6))/ethylene mixture is a critical and challenging task owing to the very similar molecular size and physical properties of the two components.While some studies have attempted this separation,there is a lack of excellent porous materials with strong binding affinity for C_(2)H_(6)-selective adsorption via an energy-efficient adsorptive separation process.Herein,we report a titanium metal-organic framework with strong binding affinity and excellent stability for the highly efficient removal of C_(2)H_(6) from C_(2)H_(6)/C_(2)H_(4) mixtures.Single component adsorption isotherms demonstrated a larger amount of adsorbed ethane(1.16 mmol·g^(-1) under 1 kPa)and high C_(2)H_(6)/C_(2)H_(4) selectivity(2.7)for equimolar C_(2)H_(6)/C_(2)H_(4) mixtures,especially in the low-pressure range,which is further confirmed by the results of grand canonical Monte Carlo simulations for C_(2)H_(6) adsorption in this framework.The experimental breakthrough curves showed that C_(2)H_(4) with a high purity was collected directly from both 1:9 and 1:15 C_(2)H_(6)/C_(2)H_(4)(volume ratio)mixtures at 298 K and 100 kPa.Moreover,the unchanged adsorption and separation performance after cycling experiments confirmed the promising applicability of this material in future.
