Immobilize Cu(Ⅰ)into π-complexed MOF adsorbent for selectivity separation of ethane/ethylene
As a common adsorbent,metal-organic frameworks(MOFs)has been widely researched in the separation of ethane and ethylene gas mixtures,and the π-complexation generated by the introduction of metal ions can significantly improve the adsorption capacity of MOFs for ethylene.Cu(Ⅰ)was loaded into the dihydroxyl-functionalized UiO-66,and a Cu(Ⅰ)@UiO-66-(OH)2 adsorbent that preferentially adsorbed ethylene was obtained.The hydroxyl functionalized framework has a synergistic effect with Cu(Ⅰ)while enhancing the polarity,which can effectively improve the adsorption and separation performance of ethylene/ethane.The calculated C2H4/C2H6 IAST selectivity of 3％(mass)Cu(Ⅰ)@UiO-66-(OH)2 at 298 K and 1 bar is 2.98,which is approximately 3 times of the original UiO-66-(OH)2.Single-component adsorption experiments show that the adsorption capacity of 3％Cu(Ⅰ)@UiO-66-(OH)2 for ethylene is higher than that of ethane in the whole pressure range,and its adsorption heat of ethylene(42.81 kJ·mol-1)is lower than that of many reported ethylene-selective adsorbents.The breakthrough experiments of 50/50(volume ratio)C2H4/C2H6 mixture under simulated industrial conditions further demonstrate that the 3％Cu(Ⅰ)@UiO-66-(OH)2 adsorbent can effectively separate the ethane/ethylene mixture.
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